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  • How to convert a gi-normous integer (in string format) to hex format? (C#)

    - by eviljack
    Given a potentially huge integer value (in c# string format), I want to be able to generate it's hex equivalent. Normal methods don't apply here as we are talking arbitrarily large numbers, 50 digits or more. The techniques I've seen which use a technique like this: // Store integer 182 int decValue = 182; // Convert integer 182 as a hex in a string variable string hexValue = decValue.ToString("X"); // Convert the hex string back to the number int decAgain = int.Parse(hexValue, System.Globalization.NumberStyles.HexNumber); won't work because the integer to convert is too large. For example I need to be able to convert a string like this: 843370923007003347112437570992242323 to it's hex equivalent. these don't work: http://stackoverflow.com/questions/1139957/c-convert-int-to-hex-and-back-again http://stackoverflow.com/questions/74148/how-to-convert-numbers-between-hex-and-decimal-in-c

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  • How do I convert the below PHP code to VB.NET?

    - by Greg
    How do I convert the below PHP code to VB.NET? <?php $X_HOST ="foo.com"; $X_URL = "/index.php"; $X_PORT ="8080"; $X_USERNAME = "foo"; $X_PASSWORD = "bar"; $s_POST_DATA = "Channel=UK.VODAFONE"; // Channel $s_POST_DATA .= "&Shortcode=12345"; // Shortcode $s_POST_DATA .= "&SourceReference=3456"; // Source Reference $s_POST_DATA .= "&MSISDN=447811111111"; // Phone $s_POST_DATA .= "&Content=test"; // Content $s_POST_DATA .= "&DataType=0"; // Data Type $s_POST_DATA .= "&Premium=1"; // Premium $s_POST_DATA .= "&CampaignID=4321"; // CampaignID $s_Request = "POST ".$X_URL." HTTP/1.0\r\n"; $s_Request .="Host: ".$X_HOST.":".$X_PORT."\r\n"; $s_Request .="Authorization: Basic ".base64_encode($X_USERNAME.":".$X_PASSWORD)."\r\n"; $s_Request .="Content-Type: application/x-www-form-urlencoded\r\n"; $s_Request .="Content-Length: ".strlen($s_POST_DATA)."\r\n"; $s_Request .="\r\n".$s_POST_DATA; //Sends out the request to the server. $fp = fsockopen ($X_HOST, $X_PORT, $errno, $errstr, 30) or die("Error!!!"); fputs ($fp, $s_Request); while (!feof($fp)) { $s_GatewayResponse .= fgets ($fp, 128); } fclose ($fp); //Array of official response codes. $a_Responses = array( "100" => "Server has returned an unspecified error.", "101" => "Server successfully received the request.", "102" => "Server has returned an database error", "103" => "Server has returned an syntax error." ); echo "<HTML>\n<BODY>\n\n"; //Checks for an official response code. foreach ($a_Responses as $s_ResponseCode => $s_ResponseDescription) { if (stristr($s_GatewayResponse, "\n$s_ResponseCode\n")) { echo "A response code of $s_ResponseCode was returned – "; echo $s_ResponseDescription"; $b_CodeReturned = true; } } //Checks for an authorization failure where an official response code has //not been recognized. if (!$b_CodeReturned) { if (stristr($s_GatewayResponse, "HTTP/1.1 401")) { echo "The server rejected your username/password (HTTP 401)."; } else { echo "No recognised response code was returned by the server."; } } echo "\n\n</BODY>\n</HTML>"; ?> and <?php $s_ref = $HTTP_POST_VARS["Reference"]; // Reference $s_trg = $HTTP_POST_VARS["Trigger"]; // trigger $s_shc = $HTTP_POST_VARS["Shortcode"]; // shortcode $s_pho = $HTTP_POST_VARS["MSISDN"]; // MSISDN $s_con = $HTTP_POST_VARS["Content"]; // Content $s_chn = $HTTP_POST_VARS["Channel"]; // Channel $s_pay = $HTTP_POST_VARS["DataType"]; // Data Type $s_dat = $HTTP_POST_VARS["DateReceived"]; // Date Received $s_cam = $HTTP_POST_VARS["CampaignID"]; // CampaignID $b_IsValid = getValidateRequest($s_ref, $s_trg, $s_shc, $s_pho, $s_con, $s_cam, $s_chn, $s_pay, $s_dat); if ($b_IsValid) { $s_ResponseCode = "success"; } else { $s_ResponseCode = "fail"; } exit($s_ResponseCode); /*******************************************************************************/ function getValidateRequest ($s_req_ref, $s_req_trg, $s_req_shc, $s_req_pho, $s_req_con, $s_req_cam, $s_req_chn, $s_req_pay, $s_req_dat) { /* * Stub function to be replaced with whatever process is needed to * process/validate request from server by specific client requirements. */ return(true); } ?> lastly <?php $s_ref = $HTTP_POST_VARS["Reference"]; // Reference $s_sta = $HTTP_POST_VARS["Status"]; // Status $s_dat = $HTTP_POST_VARS["DateDelivered"]; // Date Delivered $b_IsValid = getValidateReceipt($s_ref, $s_sta, $s_dat); if ($b_IsValid) { $s_ResponseCode = "success"; } else { $s_ResponseCode = "fail"; } exit($s_ResponseCode); /*******************************************************************************/ function getValidateReceipt ($s_req_ref, $s_req_sta, $s_req_dat) { /* * Stub function to be replaced with whatever process is needed to * process/validate receipts from server by specific client requirements. */ return(true); } ?> Thank you very much in advance Regards Greg

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  • How to record sound from a microphone in VB6?

    - by Clay Nichols
    We've been recording sound for over a decade using what seems like a very clunky method using the Winmm.dll and the MCIsendString. I've read that this doesn't set the recording quality value correctly (not sure if that article was ever true or is still true). I was wondering if there is any better way to record sound.

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  • Convert SelectedObjectCollection to Collection of Specific Type

    - by Jonathan Wood
    I have a WinForms multiselect listbox, and each item in the listbox is of type MyClass. I am also writing a method that needs to take a parameter that is a collection of MyClass. It could be of type MyClass[], List<MyClass>, IList<MyClass>, IEnumerable<MyClass>, etc. Any of those would work fine. Somehow, I need to pass the selected items in the listbox to my method. But how would I convert SelectedObjectCollection to any of the MyClass collection types described above?

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  • Convert Hexadecimal String to Data

    - by AriX
    Hi Stack Overflow, I have found a whole lot of different solutions to this problem, but not all of them work, and a lot of them seem somewhat hacky and inefficient. Basically I have a string of hexadecimal data (i.e. "55 AA 41 2A 00 94 55 AA BB BB 00 FF") which I would like to convert to raw data. What is the best way to do this? UPDATE: Vicky's solution worked great for me, but I changed it to work with hexadecimal strings that don't have spaces in between and changed the style a bit. int i = 0; char *hexString = "55AA412A009455AABBBB00FF" char *hexPtr = hexString; unsigned int *result = calloc(strlen(hexString)/2 + 1, sizeof *result); while (sscanf(hexPtr, "%02x", &result[i++])) { hexPtr += 2; if (hexPtr >= hexString + strlen(hexString)) break; } return result;

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  • can the python wave module accept StringIO object

    - by user368005
    i'm trying to use the wave module to read wav files in python. whats not typical of my applications is that I'm NOT using a file or a filename to read the wav file, but instead i have the wav file in a buffer. And here's what i'm doing import StringIO buffer = StringIO.StringIO() buffer.output(wav_buffer) file = wave.open(buffer, 'r') but i'm getting a EOFError when i run it... File "/System/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/wave.py", line 493, in open return Wave_read(f) File "/System/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/wave.py", line 163, in __init__ self.initfp(f) File "/System/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/wave.py", line 128, in initfp self._file = Chunk(file, bigendian = 0) File "/System/Library/Frameworks/Python.framework/Versions/2.5/lib/python2.5/chunk.py", line 63, in __init__ raise EOFError i know the StringIO stuff works for creation of wav file and i tried the following and it works import StringIO buffer = StringIO.StringIO() audio_out = wave.open(buffer, 'w') audio_out.setframerate(m.getRate()) audio_out.setsampwidth(2) audio_out.setcomptype('NONE', 'not compressed') audio_out.setnchannels(1) audio_out.writeframes(raw_audio) audio_out.close() buffer.flush() # these lines do not work... # buffer.output(wav_buffer) # file = wave.open(buffer, 'r') # this file plays out fine in VLC file = open(FILE_NAME + ".wav", 'w') file.write(buffer.getvalue()) file.close() buffer.close()

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  • Correct way to Convert 16bit PCM Wave data to float

    - by fredley
    I have a wave file in 16bit PCM form. I've got the raw data in a byte[] and a method for extracting samples, and I need them in float format, i.e. a float[] to do a Fourier Transform. Here's my code, does this look right? I'm working on Android so javax.sound.sampled etc. is not available. private static short getSample(byte[] buffer, int position) { return (short) (((buffer[position + 1] & 0xff) << 8) | (buffer[position] & 0xff)); } ... float[] samples = new float[samplesLength]; for (int i = 0;i<input.length/2;i+=2){ samples[i/2] = (float)getSample(input,i) / (float)Short.MAX_VALUE; }

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  • How `is_base_of` works?

    - by Alexey Malistov
    Why the following code works? typedef char (&yes)[1]; typedef char (&no)[2]; template <typename B, typename D> struct Host { operator B*() const; operator D*(); }; template <typename B, typename D> struct is_base_of { template <typename T> static yes check(D*, T); static no check(B*, int); static const bool value = sizeof(check(Host<B,D>(), int())) == sizeof(yes); }; //Test sample class Base {}; class Derived : private Base {}; //Exspression is true. int test[is_base_of<Base,Derived>::value && !is_base_of<Derived,Base>::value]; Note that B is private base. Note that operator B*() is const. How does this work? Why this works? Why static yes check(D*, T); is better than static yes check(B*, int); ?

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  • Convert Unix Epoch Time to Seconds in SQL or .NET

    - by user293249
    First let me thank you all for your help. What I need is a function that takes in a EPOCH time stamp, like 1452.235687 and converts it to a readable timestamp like '01-01-1970 00:00:00'. More specifically I only need the time not the date. If at all possible I would prefer a .NET function instead of a SQL stored procedure. However an SQL stored procedure would work fine as well. Thank you again,

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  • How to get the running of time of my program with gettimeofday()

    - by Mechko
    So I get the time at the beginning of the code, run it, and then get the time. struct timeval begin, end; gettimeofday(&begin, NULL); //code to time gettimeofday(&end, NULL); //get the total number of ms that the code took: unsigned int t = end.tv_usec - begin.tv_usec; Now I want to print it out in the form "**code took 0.007 seconds to run" or something similar. So two problems: 1) t seems to contain a value of the order 6000, and I KNOW the code didn't take 6 seconds to run. 2) How can I convert t to a double, given that it's an unsigned int? Or is there an easier way to print the output the way I wanted to?

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  • Hot to get generic type from object type

    - by Murat
    My Classes are; class BaseClass { } class DerivedClass1 : BaseClass { } class GenericClass<T> { } class DerivedClass2 : BaseClass { GenericClass<DerivedClass1> subItem; } I want to access all fields of DerivedClass2 class. I use System.Reflection and FieldInfo.GetValue() method; Bu I cant get subItem field. FieldInfo.GetValue() method return type is "object". And I cant cast to GenericClass<DerivedClass1> or I cant get DerivedClass1 type. I try this with BaseClass BaseClass instance = FieldInfo.Getvalue(this) as GenericClass<BaseClass>; but instance is null. How to get instance with type or how to get only type?

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  • Why do calls to waveOutGetPosition hang?

    - by MusiGenesis
    I'm using the winmm.dll API method waveOutGetPosition to get the current position of the playback of a WAV file. Sometimes this works as expected for me, but eventually one of the calls never returns and my application locks up. I found this thread with a few users who have experienced the same problem: http://social.msdn.microsoft.com/Forums/en-US/windowsgeneraldevelopmentissues/thread/c6a1e80e-4a18-47e7-af11-56a89f638ad7 but no solution. Has anyone run into this problem before?

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  • What does LAME text does in MP3 file?

    - by Dims
    I see here http://en.wikipedia.org/wiki/MP3 that MP3 file consists of MP3 headers interchanged with MP3 data. MP3 header consist of few bytes. But here is my MP3 file dump with ID3 tag cut. Header is highlighted with blue. You can see that "LAME3.96" text is highlighted with green. What does it does there? Is this a part of MP3 elementary stream? Or this is the part of some headers I didn't tag?

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  • What exactly does raw microphone data represent?

    - by esperantist
    I'm using PyAudio, a PortAudio wrapper for Python. I'm getting data from a microphone. Data which is represented by a continuous stream of bytes divided into chunks (of a size determined by me). I've tried to plot the signal, assuming the bytes represent the current signal amplitude, but I get an interesting image that I can't easily describe. ^^ It seems to be composed of two waves, one shifted from the other. What exactly do the particular bytes represent, and how does this change when I'm recording only one channel, instead of two? Any explanations, suggestions, code snippets, anything, very welcome! (I'm new at this.) Thanks!

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  • How can I perform a web query in C# similar to the Data > Import External Data > New Web Query in Mi

    - by TNT
    I need to pull data from a table on a website. I can easily do this in VBA using the Web Query, but I need to do this in C#. I'm just having some trouble figuring out how to properly convert the code. I got something close, but it's returning HTML with the data. I just want the data. Any help would be great. The block of code giving me issues is below: Private Function GetData(ByVal theURL As String, ByVal theRow As Integer, ByVal thePosition As Integer, ByVal theColumn As String, ByVal theTable As Integer) With ActiveSheet.QueryTables.Add(Connection:="URL;" + theURL, Destination:=Sheet2.Range(theColumn & theRow + 1)) .Name = "op?s=" + Mid(theURL, thePosition + 1) + "_1" .PreserveFormatting = True .AdjustColumnWidth = True .WebTables = theTable .Refresh BackgroundQuery:=False End With End Function

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  • Rapid calls to fread crashes the application

    - by Slynk
    I'm writing a function to load a wave file and, in the process, split the data into 2 separate buffers if it's stereo. The program gets to i = 18 and crashes during the left channel fread pass. (You can ignore the couts, they are just there for debugging.) Maybe I should load the file in one pass and use memmove to fill the buffers? if(params.channels == 2){ params.leftChannelData = new unsigned char[params.dataSize/2]; params.rightChannelData = new unsigned char[params.dataSize/2]; bool isLeft = true; int offset = 0; const int stride = sizeof(BYTE) * (params.bitsPerSample/8); for(int i = 0; i < params.dataSize; i += stride) { std::cout << "i = " << i << " "; if(isLeft){ std::cout << "Before Left Channel, "; fread(params.leftChannelData+offset, sizeof(BYTE), stride, file + i); std::cout << "After Left Channel, "; } else{ std::cout << "Before Right Channel, "; fread(params.rightChannelData+offset, sizeof(BYTE), stride, file + i); std::cout << "After Right Channel, "; offset += stride; std::cout << "After offset incr.\n"; } isLeft != isLeft; } } else { params.leftChannelData = new unsigned char[params.dataSize]; fread(params.leftChannelData, sizeof(BYTE), params.dataSize, file); }

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