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  • Find out CRC or CHECKSUM of RS232 data

    - by Carlos Alloatti
    I need to communicate with a RS232 device, I have no specs or information available. I send a 16 byte command and get a 16 byte result back. The last byte looks like some kind of crc or checksum, I have tried using this http://miscel.dk/MiscEl/miscelCRCandChecksum.html with no luck. Anyone can reverse engineer the crc/checksum algorithm? here is some data captured with an RS-232 monitor program: 01 80 42 00 00 00 00 00 00 00 00 00 00 00 01 B3 01 80 42 00 00 00 00 00 00 00 00 00 00 00 02 51 01 80 42 00 00 00 00 00 00 00 00 00 00 00 03 0F 01 80 42 00 00 00 00 00 00 00 00 00 00 00 04 8C 01 80 42 00 00 00 00 00 00 00 00 00 00 00 05 D2 01 80 42 00 00 00 00 00 00 00 00 00 00 00 06 30 01 80 42 00 00 00 00 00 00 00 00 00 00 00 07 6E 01 80 42 00 00 00 00 00 00 00 00 00 00 00 08 2F 01 80 42 00 00 00 00 00 00 00 00 00 00 00 09 71 01 80 42 00 00 00 00 00 00 00 00 00 00 00 0A 93 01 80 42 00 00 00 00 00 00 00 00 00 00 00 0B CD 01 80 42 00 00 00 00 00 00 00 00 00 00 00 0C 4E 01 80 42 00 00 00 00 00 00 00 00 00 00 00 0D 10 01 80 42 00 00 00 00 00 00 00 00 00 00 00 0E F2 01 80 42 00 00 00 00 00 00 00 00 00 00 00 0F AC 01 80 42 00 00 00 00 00 00 00 00 00 00 00 10 70 01 80 42 00 00 00 00 00 00 00 00 00 00 00 11 2E 01 80 42 00 00 00 00 00 00 00 00 00 00 00 12 CC 01 80 42 00 00 00 00 00 00 00 00 00 00 00 13 92 01 80 42 00 00 00 00 00 00 00 00 00 00 00 14 11 01 80 42 00 00 00 00 00 00 00 00 00 00 00 15 4F 01 80 42 00 00 00 00 00 00 00 00 00 00 00 16 AD 01 80 42 00 00 00 00 00 00 00 00 00 00 00 17 F3 01 80 42 00 00 00 00 00 00 00 00 00 00 00 18 B2 01 80 42 00 00 00 00 00 00 00 00 00 00 00 19 EC 01 80 42 00 00 00 00 00 00 00 00 00 00 00 1A 0E 01 80 42 00 00 00 00 00 00 00 00 00 00 00 1B 50 01 80 42 00 00 00 00 00 00 00 00 00 00 00 1C D3 01 80 42 00 00 00 00 00 00 00 00 00 00 00 1D 8D 01 80 42 00 00 00 00 00 00 00 00 00 00 00 1E 6F 01 80 42 00 00 00 00 00 00 00 00 00 00 00 1F 31 01 80 42 00 00 00 00 00 00 00 00 00 00 00 20 CE 01 80 42 00 00 00 00 00 00 00 00 00 00 00 21 90 01 80 42 00 00 00 00 00 00 00 00 00 00 00 22 72 01 80 42 00 00 00 00 00 00 00 00 00 00 00 23 2C 01 80 42 00 00 00 00 00 00 00 00 00 00 00 24 AF 01 80 42 00 00 00 00 00 00 00 00 00 00 00 25 F1 01 80 42 00 00 00 00 00 00 00 00 00 00 00 26 13 01 80 42 00 00 00 00 00 00 00 00 00 00 00 27 4D 01 80 42 00 00 00 00 00 00 00 00 00 00 00 28 0C 01 80 42 00 00 00 00 00 00 00 00 00 00 00 29 52 01 80 42 00 00 00 00 00 00 00 00 00 00 00 2A B0 01 80 42 00 00 00 00 00 00 00 00 00 00 00 2B EE 01 80 42 00 00 00 00 00 00 00 00 00 00 00 2C 6D 01 80 42 00 00 00 00 00 00 00 00 00 00 00 2D 33 01 80 42 00 00 00 00 00 00 00 00 00 00 00 2E D1 01 80 42 00 00 00 00 00 00 00 00 00 00 00 2F 8F 01 80 42 00 00 00 00 00 00 00 00 00 00 00 30 53 01 80 42 00 00 00 00 00 00 00 00 00 00 00 31 0D 01 80 42 00 00 00 00 00 00 00 00 00 00 00 32 EF 01 80 42 00 00 00 00 00 00 00 00 00 00 00 33 B1 01 80 42 00 00 00 00 00 00 00 00 00 00 00 34 32 01 80 42 00 00 00 00 00 00 00 00 00 00 00 35 6C 01 80 42 00 00 00 00 00 00 00 00 00 00 00 36 8E 01 80 42 00 00 00 00 00 00 00 00 00 00 00 37 D0 01 80 42 00 00 00 00 00 00 00 00 00 00 00 38 91 01 80 42 00 00 00 00 00 00 00 00 00 00 00 39 CF 01 80 42 00 00 00 00 00 00 00 00 00 00 00 3A 2D 01 80 42 00 00 00 00 00 00 00 00 00 00 00 3B 73 01 80 42 00 00 00 00 00 00 00 00 00 00 00 3C F0 01 80 42 00 00 00 00 00 00 00 00 00 00 00 3D AE 01 80 42 00 00 00 00 00 00 00 00 00 00 00 3E 4C 01 80 42 00 00 00 00 00 00 00 00 00 00 00 3F 12 01 80 42 00 00 00 00 00 00 00 00 00 00 00 40 AB 01 80 42 00 00 00 00 00 00 00 00 00 00 00 41 F5 01 80 42 00 00 00 00 00 00 00 00 00 00 00 42 17 01 80 42 00 00 00 00 00 00 00 00 00 00 00 43 49 01 80 42 00 00 00 00 00 00 00 00 00 00 00 44 CA 01 80 42 00 00 00 00 00 00 00 00 00 00 00 45 94 01 80 42 00 00 00 00 00 00 00 00 00 00 00 46 76 01 80 42 00 00 00 00 00 00 00 00 00 00 00 47 28 01 80 42 00 00 00 00 00 00 00 00 00 00 00 48 69 01 80 42 00 00 00 00 00 00 00 00 00 00 00 49 37 01 80 42 00 00 00 00 00 00 00 00 00 00 00 4A D5 01 80 42 00 00 00 00 00 00 00 00 00 00 00 4B 8B 01 80 42 00 00 00 00 00 00 00 00 00 00 00 4C 08 01 80 42 00 00 00 00 00 00 00 00 00 00 00 4D 56 01 80 42 00 00 00 00 00 00 00 00 00 00 00 4E B4 01 80 42 00 00 00 00 00 00 00 00 00 00 00 4F EA 01 80 42 00 00 00 00 00 00 00 00 00 00 00 50 36 01 80 42 00 00 00 00 00 00 00 00 00 00 00 51 68 01 80 42 00 00 00 00 00 00 00 00 00 00 00 52 8A 01 80 42 00 00 00 00 00 00 00 00 00 00 00 53 D4 01 80 42 00 00 00 00 00 00 00 00 00 00 00 54 57 01 80 42 00 00 00 00 00 00 00 00 00 00 00 55 09 01 80 42 00 00 00 00 00 00 00 00 00 00 00 56 EB 01 80 42 00 00 00 00 00 00 00 00 00 00 00 57 B5 01 80 42 00 00 00 00 00 00 00 00 00 00 00 58 F4 01 80 42 00 00 00 00 00 00 00 00 00 00 00 59 AA 01 80 42 00 00 00 00 00 00 00 00 00 00 00 5A 48 01 80 42 00 00 00 00 00 00 00 00 00 00 00 5B 16 01 80 42 00 00 00 00 00 00 00 00 00 00 00 5C 95 01 80 42 00 00 00 00 00 00 00 00 00 00 00 5D CB 01 80 42 00 00 00 00 00 00 00 00 00 00 00 5E 29 01 80 42 00 00 00 00 00 00 00 00 00 00 00 5F 77 01 80 42 00 00 00 00 00 00 00 00 00 00 00 60 88 01 80 42 00 00 00 00 00 00 00 00 00 00 00 61 D6 01 80 42 00 00 00 00 00 00 00 00 00 00 00 62 34 01 80 42 00 00 00 00 00 00 00 00 00 00 00 63 6A 01 80 42 00 00 00 00 00 00 00 00 00 00 00 64 E9 01 80 42 00 00 00 00 00 00 00 00 00 00 00 65 B7 01 80 42 00 00 00 00 00 00 00 00 00 00 00 66 55 01 80 42 00 00 00 00 00 00 00 00 00 00 00 67 0B 01 80 42 00 00 00 00 00 00 00 00 00 00 00 68 4A 01 80 42 00 00 00 00 00 00 00 00 00 00 00 69 14 01 80 42 00 00 00 00 00 00 00 00 00 00 00 6A F6 01 80 42 00 00 00 00 00 00 00 00 00 00 00 6B A8 01 80 42 00 00 00 00 00 00 00 00 00 00 00 6C 2B 01 80 42 00 00 00 00 00 00 00 00 00 00 00 6D 75 01 80 42 00 00 00 00 00 00 00 00 00 00 00 6E 97 01 80 42 00 00 00 00 00 00 00 00 00 00 00 6F C9 01 80 42 00 00 00 00 00 00 00 00 00 00 00 70 15 01 80 42 00 00 00 00 00 00 00 00 00 00 00 71 4B 01 80 42 00 00 00 00 00 00 00 00 00 00 00 72 A9 01 80 42 00 00 00 00 00 00 00 00 00 00 00 73 F7 01 80 42 00 00 00 00 00 00 00 00 00 00 00 74 74 01 80 42 00 00 00 00 00 00 00 00 00 00 00 75 2A 01 80 42 00 00 00 00 00 00 00 00 00 00 00 76 C8 01 80 42 00 00 00 00 00 00 00 00 00 00 00 77 96 01 80 42 00 00 00 00 00 00 00 00 00 00 00 78 D7 01 80 42 00 00 00 00 00 00 00 00 00 00 00 79 89 01 80 42 00 00 00 00 00 00 00 00 00 00 00 7A 6B 01 80 42 00 00 00 00 00 00 00 00 00 00 00 7B 35 01 80 42 00 00 00 00 00 00 00 00 00 00 00 7C B6 01 80 42 00 00 00 00 00 00 00 00 00 00 00 7D E8 01 80 42 00 00 00 00 00 00 00 00 00 00 00 7E 0A 01 80 42 00 00 00 00 00 00 00 00 00 00 00 7F 54 01 80 42 00 00 00 00 00 00 00 00 00 00 00 80 61 01 80 42 00 00 00 00 00 00 00 00 00 00 00 81 3F 01 80 42 00 00 00 00 00 00 00 00 00 00 00 82 DD 01 80 42 00 00 00 00 00 00 00 00 00 00 00 83 83 01 80 42 00 00 00 00 00 00 00 00 00 00 00 84 00 01 80 42 00 00 00 00 00 00 00 00 00 00 00 85 5E 01 80 42 00 00 00 00 00 00 00 00 00 00 00 86 BC 01 80 42 00 00 00 00 00 00 00 00 00 00 00 87 E2 01 80 42 00 00 00 00 00 00 00 00 00 00 00 88 A3 01 80 42 00 00 00 00 00 00 00 00 00 00 00 89 FD 01 80 42 00 00 00 00 00 00 00 00 00 00 00 8A 1F 01 80 42 00 00 00 00 00 00 00 00 00 00 00 8B 41 01 80 42 00 00 00 00 00 00 00 00 00 00 00 8C C2 01 80 42 00 00 00 00 00 00 00 00 00 00 00 8D 9C 01 80 42 00 00 00 00 00 00 00 00 00 00 00 8E 7E 01 80 42 00 00 00 00 00 00 00 00 00 00 00 8F 20 01 80 42 00 00 00 00 00 00 00 00 00 00 00 90 FC 01 80 42 00 00 00 00 00 00 00 00 00 00 00 91 A2 01 80 42 00 00 00 00 00 00 00 00 00 00 00 92 40 01 80 42 00 00 00 00 00 00 00 00 00 00 00 93 1E 01 80 42 00 00 00 00 00 00 00 00 00 00 00 94 9D 01 80 42 00 00 00 00 00 00 00 00 00 00 00 95 C3 01 80 42 00 00 00 00 00 00 00 00 00 00 00 96 21 01 80 42 00 00 00 00 00 00 00 00 00 00 00 97 7F 01 80 42 00 00 00 00 00 00 00 00 00 00 00 98 3E 01 80 42 00 00 00 00 00 00 00 00 00 00 00 99 60 01 80 42 00 00 00 00 00 00 00 00 00 00 00 9A 82 01 80 42 00 00 00 00 00 00 00 00 00 00 00 9B DC 01 80 42 00 00 00 00 00 00 00 00 00 00 00 9C 5F 01 80 42 00 00 00 00 00 00 00 00 00 00 00 9D 01 01 80 42 00 00 00 00 00 00 00 00 00 00 00 9E E3 01 80 42 00 00 00 00 00 00 00 00 00 00 00 9F BD 01 80 42 00 00 00 00 00 00 00 00 00 00 00 A0 42 01 80 42 00 00 00 00 00 00 00 00 00 00 00 A1 1C 01 80 42 00 00 00 00 00 00 00 00 00 00 00 A2 FE 01 80 42 00 00 00 00 00 00 00 00 00 00 00 A3 A0 01 80 42 00 00 00 00 00 00 00 00 00 00 00 A4 23 01 80 42 00 00 00 00 00 00 00 00 00 00 00 A5 7D 01 80 42 00 00 00 00 00 00 00 00 00 00 00 A6 9F 01 80 42 00 00 00 00 00 00 00 00 00 00 00 A7 C1 01 80 42 00 00 00 00 00 00 00 00 00 00 00 A8 80 01 80 42 00 00 00 00 00 00 00 00 00 00 00 A9 DE 01 80 42 00 00 00 00 00 00 00 00 00 00 00 AA 3C 01 80 42 00 00 00 00 00 00 00 00 00 00 00 AB 62 01 80 42 00 00 00 00 00 00 00 00 00 00 00 AC E1 01 80 42 00 00 00 00 00 00 00 00 00 00 00 AD BF 01 80 42 00 00 00 00 00 00 00 00 00 00 00 AE 5D 01 80 42 00 00 00 00 00 00 00 00 00 00 00 AF 03 01 80 42 00 00 00 00 00 00 00 00 00 00 00 B0 DF 01 80 42 00 00 00 00 00 00 00 00 00 00 00 B1 81 01 80 42 00 00 00 00 00 00 00 00 00 00 00 B2 63 01 80 42 00 00 00 00 00 00 00 00 00 00 00 B3 3D 01 80 42 00 00 00 00 00 00 00 00 00 00 00 B4 BE 01 80 42 00 00 00 00 00 00 00 00 00 00 00 B5 E0 01 80 42 00 00 00 00 00 00 00 00 00 00 00 B6 02 01 80 42 00 00 00 00 00 00 00 00 00 00 00 B7 5C 01 80 42 00 00 00 00 00 00 00 00 00 00 00 B8 1D 01 80 42 00 00 00 00 00 00 00 00 00 00 00 B9 43 01 80 42 00 00 00 00 00 00 00 00 00 00 00 BA A1 01 80 42 00 00 00 00 00 00 00 00 00 00 00 BB FF 01 80 42 00 00 00 00 00 00 00 00 00 00 00 BC 7C 01 80 42 00 00 00 00 00 00 00 00 00 00 00 BD 22 01 80 42 00 00 00 00 00 00 00 00 00 00 00 BE C0 01 80 42 00 00 00 00 00 00 00 00 00 00 00 BF 9E 01 80 42 00 00 00 00 00 00 00 00 00 00 00 C0 27 01 80 42 00 00 00 00 00 00 00 00 00 00 00 C1 79 01 80 42 00 00 00 00 00 00 00 00 00 00 00 C2 9B 01 80 42 00 00 00 00 00 00 00 00 00 00 00 C3 C5 01 80 42 00 00 00 00 00 00 00 00 00 00 00 C4 46 01 80 42 00 00 00 00 00 00 00 00 00 00 00 C5 18 01 80 42 00 00 00 00 00 00 00 00 00 00 00 C6 FA 01 80 42 00 00 00 00 00 00 00 00 00 00 00 C7 A4 01 80 42 00 00 00 00 00 00 00 00 00 00 00 C8 E5 01 80 42 00 00 00 00 00 00 00 00 00 00 00 C9 BB 01 80 42 00 00 00 00 00 00 00 00 00 00 00 CA 59 01 80 42 00 00 00 00 00 00 00 00 00 00 00 CB 07 01 80 42 00 00 00 00 00 00 00 00 00 00 00 CC 84 01 80 42 00 00 00 00 00 00 00 00 00 00 00 CD DA 01 80 42 00 00 00 00 00 00 00 00 00 00 00 CE 38 01 80 42 00 00 00 00 00 00 00 00 00 00 00 CF 66 01 80 42 00 00 00 00 00 00 00 00 00 00 00 D0 BA 01 80 42 00 00 00 00 00 00 00 00 00 00 00 D1 E4 01 80 42 00 00 00 00 00 00 00 00 00 00 00 D2 06 01 80 42 00 00 00 00 00 00 00 00 00 00 00 D3 58 01 80 42 00 00 00 00 00 00 00 00 00 00 00 D4 DB 01 80 42 00 00 00 00 00 00 00 00 00 00 00 D5 85 01 80 42 00 00 00 00 00 00 00 00 00 00 00 D6 67 01 80 42 00 00 00 00 00 00 00 00 00 00 00 D7 39 01 80 42 00 00 00 00 00 00 00 00 00 00 00 D8 78 01 80 42 00 00 00 00 00 00 00 00 00 00 00 D9 26 01 80 42 00 00 00 00 00 00 00 00 00 00 00 DA C4 01 80 42 00 00 00 00 00 00 00 00 00 00 00 DB 9A 01 80 42 00 00 00 00 00 00 00 00 00 00 00 DC 19 01 80 42 00 00 00 00 00 00 00 00 00 00 00 DD 47 01 80 42 00 00 00 00 00 00 00 00 00 00 00 DE A5 01 80 42 00 00 00 00 00 00 00 00 00 00 00 DF FB 01 80 42 00 00 00 00 00 00 00 00 00 00 00 E0 04 01 80 42 00 00 00 00 00 00 00 00 00 00 00 E1 5A 01 80 42 00 00 00 00 00 00 00 00 00 00 00 E2 B8 01 80 42 00 00 00 00 00 00 00 00 00 00 00 E3 E6 01 80 42 00 00 00 00 00 00 00 00 00 00 00 E4 65 01 80 42 00 00 00 00 00 00 00 00 00 00 00 E5 3B 01 80 42 00 00 00 00 00 00 00 00 00 00 00 E6 D9 01 80 42 00 00 00 00 00 00 00 00 00 00 00 E7 87 01 80 42 00 00 00 00 00 00 00 00 00 00 00 E8 C6 01 80 42 00 00 00 00 00 00 00 00 00 00 00 E9 98 01 80 42 00 00 00 00 00 00 00 00 00 00 00 EA 7A 01 80 42 00 00 00 00 00 00 00 00 00 00 00 EB 24 01 80 42 00 00 00 00 00 00 00 00 00 00 00 EC A7 01 80 42 00 00 00 00 00 00 00 00 00 00 00 ED F9 01 80 42 00 00 00 00 00 00 00 00 00 00 00 EE 1B 01 80 42 00 00 00 00 00 00 00 00 00 00 00 EF 45 01 80 42 00 00 00 00 00 00 00 00 00 00 00 F0 99 01 80 42 00 00 00 00 00 00 00 00 00 00 00 F1 C7 01 80 42 00 00 00 00 00 00 00 00 00 00 00 F2 25 01 80 42 00 00 00 00 00 00 00 00 00 00 00 F3 7B 01 80 42 00 00 00 00 00 00 00 00 00 00 00 F4 F8 01 80 42 00 00 00 00 00 00 00 00 00 00 00 F5 A6 01 80 42 00 00 00 00 00 00 00 00 00 00 00 F6 44 01 80 42 00 00 00 00 00 00 00 00 00 00 00 F7 1A 01 80 42 00 00 00 00 00 00 00 00 00 00 00 F8 5B 01 80 42 00 00 00 00 00 00 00 00 00 00 00 F9 05 01 80 42 00 00 00 00 00 00 00 00 00 00 00 FA E7 01 80 42 00 00 00 00 00 00 00 00 00 00 00 FB B9 01 80 42 00 00 00 00 00 00 00 00 00 00 00 FC 3A 01 80 42 00 00 00 00 00 00 00 00 00 00 00 FD 64 01 80 42 00 00 00 00 00 00 00 00 00 00 00 FE 86 01 80 42 00 00 00 00 00 00 00 00 00 00 00 FF D8 The second to last byte seems to be a sequential number that starts over at 00 when it reaches FF. I have included the whole range from 00 to FF to make it easier to guess the crc/checksum method.

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  • Why doesn't genstrings convert NSLocalizedStringFromTable entries to table.strings?

    - by juan tendero
    In my source code I have some lines like NSLocalizedStringFromTable(@"Info", @"en", @"Title of this view"). When I subsequently call genstrings -o en.lproj ./Classes/*.m I would not get the expected file en.strings but Localized.strings, although I've read in the genstrings-manpage that it would generate a table.strings file from NSLocalizedStringFromTable(a, table, c) function. Am I wrong? How would I create a table.strings file then?

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  • How to avoid this very heavy query that slows down the application?

    - by Juan Paredes
    Hi, We have a web application running in a production enviroment and at some point the client complained about how slow the application got. When we checked what was going on with the application and the database we discover this "precious" query that was being executed by several users at the same time (thus inflicting an extremely high load on the database server): SELECT NULL AS table_cat, o.owner AS table_schem, o.object_name AS table_name, o.object_type AS table_type, NULL AS remarks FROM all_objects o WHERE o.owner LIKE :1 ESCAPE :"SYS_B_0" AND o.object_name LIKE :2 ESCAPE :"SYS_B_1" AND o.object_type IN(:"SYS_B_2", :"SYS_B_3") ORDER BY table_type, table_schem, table_name Our application does not execute this query, I believe it is an Hibernate internal query. I've found little information on why Hibernate does this extremely heavy query, so any help in how to avoid it very much appreciated! The production enviroment information: Red Hat Enterprise Linux 5.3 (Tikanga), JDK 1.5, web container OC4J (whitin Oracle Application Server), Oracle Database 10.1.0.4, JDBC Driver for JDK 1.2 and 1.3, Hibernate version 3.2.6.ga, connection pool library C3P0 version 0.9.1. Thank you.

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  • Android fragments problems different layouts

    - by juan
    I have two layouts: one for portait with one container and another for landscape with two containers. In the first layout I show a fragment and when the user select one element, I replace the fragment with another (with FragmentTransation.Replace). <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" > <LinearLayout android:id="@+id/container1" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="vertical" /> </RelativeLayout> In the second layout I want to show the two fragments at one time, one in the first container and the second in the second container. <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:orientation="horizontal" > <LinearLayout android:id="@+id/container1" android:layout_width="0dp" android:layout_height="match_parent" android:layout_weight="3" android:orientation="vertical" /> <LinearLayout android:id="@+id/container2" android:layout_width="0dp" android:layout_height="match_parent" android:layout_weight="7" android:orientation="vertical" /> </LinearLayout> But I can't make this works with configuration changes. I try use different names for containers, try add fragments when only bundle is null,... Someone have a working code of this case?

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  • Pass a variable to a Symfony Form

    - by Juan Besa
    Hi, I am building a web application using Symfony 1.4 and Doctrine for a school and I want to make a very simple form to add a course to a student. The main problem I have is that in the drop down list I only want to show the courses in which the student is currently not enrolled. I already have a function in the model (in Student.class.php) which returns all the courses in which the student is not enrolled but the problem is I don't know how to pass the student to the configure() of the form. I have tried several options like passing it with the constructor of the form to a global variable or a special set method but none of them have worked. Is there any form to pass the student to the configure() method? Thanks!

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  • How do I log from inside my web application in Tomcat 6.

    - by Carlos
    How do I log from within my web application deployed on Tomcat 6? Where should I expect the logging output to go (internal tomcat log files, or will another logfile be generated)? I see a ton of documentation but am having a hard time finding a direct answer to the above questions. Where should I expect the logging to show up (currently it is log4j is not generating a log file and it is not showing up in my console). I am trying to follow http://www.laliluna.de/articles/log4j-tutorial.html . ### direct log messages to stdout ### log4j.appender.stdout=org.apache.log4j.ConsoleAppender log4j.appender.stdout.Target=System.out log4j.appender.stdout.layout=org.apache.log4j.PatternLayout log4j.appender.stdout.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n ### file appender log4j.appender.file=org.apache.log4j.RollingFileAppender log4j.appender.file.maxFileSize=100KB log4j.appender.file.maxBackupIndex=5 log4j.appender.file.File=test.log log4j.appender.file.threshold=info log4j.appender.file.layout=org.apache.log4j.PatternLayout log4j.appender.file.layout.ConversionPattern=%d{ABSOLUTE} %5p %c{1}:%L - %m%n log4j.rootLogger=debug, stdout In my application I define a log object: private static org.apache.log4j.Logger log = Logger.getLogger(MyClass.class); log.error("LOGGING!"); Thanks for the help.

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  • Languages and development methodologies

    - by Carlos
    Having never worked with Ruby on Rails, I looked it up on Wikipedia. It says It is intended to be used with an Agile development methodology that is used by web developers for rapid development. This got me asking how a given language/framework can be more appropriate for given development methodologies. Are there certain languages that are more friendly for pair programming, for instance? Are there language features that make certain methodologies are more appropriate? Are there features that make certain methodologies impossible? My initial reaction is to dismiss the connection (the design process is a business process, which is more dependent on business needs that language features). But I'm an only programmer within the firm, and I'm a partner, so I get to decide the business needs. What do you think? Also, if the SO community finds that certain languages point towards certain methodologies, what methodology is most common for c#, which is what I use most of the time?

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  • Try-Catch-Throw in the same Java class

    - by Carlos
    Is it possible to catch a method in the current class the try-catch block is running on? for example: public static void arrayOutOfBoundsException(){ System.out.println("Array out of bounds"); } ..... public static void doingSomething(){ try { if(something[i] >= something_else); } catch (arrayOutOfBoundsException e) { System.out.println("Method Halted!, continuing doing the next thing"); } } If this is possible how will it be the correct way to call the catch method? If this is not possible, could anyone point me in the right direction, of how to stop an exception from halting my program execution in Java without having to create any new classes in the package, or fixing the code that produces ArrayOutOfBoundsException error. Thanks in Advance, A Java Rookie

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  • UIImage: make an image look like a shadow

    - by Carlos Vargas
    How do I make a UIImageView show the "shadow" of the the UIImage in it? I have a dog.png file, but I just want to show the shadow of the UIImage so when I press a button it reveals the real image of the dog. so I want something like this: and after I press the button It shows the real Image: Please give me a hand on this.

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  • How to resolve this very heavy query that slows down the application?

    - by Juan Paredes
    Hi, We have a web application running in a production enviroment and at some point the client complained about how slow the application got. When we checked what was going on with the application and the database we discover this "precious" query that was being executed by several users at the same time (thus inflicting a extremely high load on the database server): SELECT NULL AS table_cat, o.owner AS table_schem, o.object_name AS table_name, o.object_type AS table_type, NULL AS remarks FROM all_objects o WHERE o.owner LIKE :1 ESCAPE :"SYS_B_0" AND o.object_name LIKE :2 ESCAPE :"SYS_B_1" AND o.object_type IN(:"SYS_B_2", :"SYS_B_3") ORDER BY table_type, table_schem, table_name Our application does not execute this query, I believe it is an Hibernate internal query. I've found little information on why Hibernate does this extremely heavy query, so any help is very much appreciated! The production enviroment information: Red Hat Enterprise Linux 5.3 (Tikanga), JDK 1.5, web container OC4J (whitin Oracle Application Server), Oracle Database 10g Release 10.0.0.1, JDBC Driver for JDK 1.2 and 1.3, Hibernate version 3.2.6.ga. Thank you.

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  • PHP client for asmx service

    - by Carlos Mora
    A few days ago I was in charge of the development of some webServices for a client, the thing is that the client also asked for a php client that consumes the webservices. The service were published online on a server, with public access, right now I can see the wsdl from any computer, but when trying to consume it with PHP it shows me an error that says something about HTTP header and blablabla, that happened before I connected with a VPN to the server where the service is being hosted, after doing the VPN just by curiosity I reloaded the php client, and I don't know why... It did worked.... Q: Can anybody tell me why did this happened?

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  • C#, finding the largest prime factor of a number

    - by Juan
    Hello! I am new at programming and I am practicing my C# programming skills. My application is meant to find the largest prime factor of a number entered by the user. But my application is not returning the right answer and I dont really know where the problem is. Can you please help me? using System; using System.Collections.Generic; using System.Linq; using System.Text; namespace ConsoleApplication1 { class Program { static void Main(string[] args) { Console.WriteLine("Calcular máximo factor primo de n. De 60 es 5."); Console.Write("Escriba un numero: "); long num = Convert.ToInt64(Console.ReadLine()); long mfp = maxfactor(num); Console.WriteLine("El maximo factor primo es: " + num); Console.Read(); } static private long maxfactor (long n) { long m=1 ; bool en= false; for (long k = n / 2; !en && k > 1; k--) { if (n % k == 0 && primo(k)) { m = k; en = true; } } return m; } static private bool primo(long x) { bool sp = true; for (long i = 2; i <= x / 2; i++) { if (x % i == 0) sp = false; } return sp; } } }

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  • How can I pause a BackgroundWorker? Or something similar...

    - by juan
    I was using a BackgroundWorker to download some web sites by calling WebClient.DownloadString inside a loop. I wanted the option for the user to cancel in the middle of downloading stuff, so I called CancelAsync whenever I found that CancellationPending was on in the middle of the loop. But now I noticed that the function DownloadString kinda freezes sometimes, so I decided to use DownloadStringAsync instead (all this inside the other thread created with BackgroundWorker). An since and don't want to rewrite my whole code by having to exit the loop and the function after calling DownloadStringAsync, I made a while loop right after calling it that does nothing but checks for a variable bool Stop that I turn true either when the DownloadStringCompleted event handler is called or when the user request to cancel the operation. Now, the weird thing is that it works fine on the debug version, but on the release one, the program freezes in the while loop like if it were the main thread.

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  • SVN Repository folders don't match my solution folder structure in Visual Studio or folder structure

    - by Carlos
    I have a .NET solution which was badly organised, so I moved some projects around to appropriate folders. In the solution, I simply fixed the paths to the new locations, and everything is working in my working copy. I used AnkhSVN to commit the solution to the repository, which worked out fine as well. However, when I look in the repo explorer, the folders inside are organised in the old way. What do I need to do?

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  • HttpURLConnection inside a loop

    - by Carlos Garces
    Hi! I'm trying to connect to one URL that I know that exist but I don't know when. I don't have access to this server so I can't change anything to receive a event. The actual code is this. URL url = new URL(urlName); for(int j = 0 ; j< POOLING && disconnected; j++){ HttpURLConnection connection = (HttpURLConnection) url.openConnection(); int status = connection.getResponseCode(); if(status == HttpURLConnection.HTTP_OK || status == HttpURLConnection.HTTP_NOT_MODIFIED){ //Some work }else{ //wait 3s Thread.sleep(3000); } } Java not is my best skill and I'm not sure if this code is good from the point of view of performance. I'm opening a new connection every 3 seconds? or the connection is reused? If I call to disconnect() I ensure that no new connections are open in the loop, but... it will impact in performance?. Suggestions? What is the fast/best ways to know it a URL exist?

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  • How to declare and implement a COM interface on C# that inherits from another COM interface?

    - by Carlos Loth
    I'm trying to understand what is the correct why to implement COM interfaces from C# code. It is straightforward when the interface doesn't inherit from other base interface. Like this one: [ComImport, Guid("2047E320-F2A9-11CE-AE65-08002B2E1262"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)] public interface IShellFolderViewCB { long MessageSFVCB(uint uMsg, int wParam, int lParam); } However things start to become weired when I need to implement an interface that inherits from other COM interfaces. For example, if I implement the IPersistFolder2 interface which inherits from IPersistFolder which inherits from IPersist as I usually on C# code: [ComImport, Guid("0000010c-0000-0000-C000-000000000046"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)] public interface IPersist { void GetClassID([Out] out Guid classID); } [ComImport, Guid("000214EA-0000-0000-C000-000000000046"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)] public interface IPersistFolder : IPersist { void Initialize([In] IntPtr pidl); } [ComImport, Guid("1AC3D9F0-175C-11d1-95BE-00609797EA4F"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)] public interface IPersistFolder2 : IPersistFolder { void GetCurFolder([Out] out IntPtr ppidl); } The operating system is not able to call the methods on my object implementation. When I'm debugging I can see the constructor of my IPersistFolder2 implementation is called many times, however the interface methods I've implemented aren't called. I'm implementing the IPersistFolder2 as follows: [Guid("A4603CDB-EC86-4E40-80FE-25D5F5FA467D")] public class PersistFolder: IPersistFolder2 { void IPersistFolder2.GetClassID(ref Guid classID) { ... } void IPersistFolder2.Initialize(IntPtr pidl) { ... } void IPersistFolder2.GetCurFolder(out IntPtr ppidl) { ... } } What seems strange is when I declare the COM interface imports as follow, it works: [ComImport, Guid("0000010c-0000-0000-C000-000000000046"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)] internal interface IPersist { void GetClassID([Out] out Guid classID); } [ComImport, Guid("000214EA-0000-0000-C000-000000000046"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)] internal interface IPersistFolder : IPersist { new void GetClassID([Out] out Guid classID); void Initialize([In] IntPtr pidl); } [ComImport, Guid("1AC3D9F0-175C-11d1-95BE-00609797EA4F"), InterfaceType(ComInterfaceType.InterfaceIsIUnknown)] internal interface IPersistFolder2 : IPersistFolder { new void GetClassID([Out] out Guid classID); new void Initialize([In] IntPtr pidl); void GetCurFolder([Out] out IntPtr ppidl); } I don't know why it works when I declare the COM interfaces that way (hidding the base interface methods using new). Maybe it is related to the way IUnknown works. Does anyone know what is the correct way of implementing COM interfaces in C# that inherits from other COM interfaces and why?

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  • boost graph adjacency_list, retrieving a node's parents

    - by Juan
    I want to find in an adjacency graph from the bgl how give a Vertexdescriptor and get the set of nodes that are parents of this given node. i would like to do this in directed graph, it seems you could use a bidirectional graph but i want to be able to restrict it so that there are no cycles.

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  • Range issue with ui-slider

    - by Carlos
    Hi, I’m trying to set up a range with a slider. I would prefer if both cursors did not overlap in the same value. In other words, how do I get the sliders to freeze and stay put when the minimum value slider and the maximum value slider come next to each other. Any ideas? Thank you in advance.

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