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  • Get pointer to member function from within member function in C++

    - by Eli
    Currently in the program I am attempting to write I need to be able to get a pointer to a member function within a member function of the same class. The pointer needs to be passed to a function as a void (*)(). Example: //CallFunc takes a void (*)() argument class testClass { public: void aFunc2; void aFunc1; } void testClass:aFunc2(){ callFunc(this.*aFunc1); // How should this be done? } void testClass:aFunc1(){ int someVariable = 1; } I'm trying to do this in GCC 4.0.1. Also, the member function being called can't be static because it references non-static variables in the class that it is part of.

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  • Java Convert ColorSpace of BufferedImage to CS_GRAY without using ConvertColorOp

    - by gmatt
    I know its possible to convert an image to CS_GRAY using public static BufferedImage getGrayBufferedImage(BufferedImage image) { BufferedImageOp op = new ColorConvertOp(ColorSpace .getInstance(ColorSpace.CS_GRAY), null); BufferedImage sourceImgGray = op.filter(image, null); return sourceImgGray; } however, this is a chokepoint of my entire program. I need to do this often, on 800x600 pixel images and takes about 200-300ms for this operation to complete, on average. I know I can do this alot faster by using one for loop to loop through the image data and set it right away. The code above on the other hand constructs a brand new 800x600 BufferedImage that is gray scale. I would rather just transform the image I pass in. Does any one know how to do this with a for loop and given that the image is RGB color space?

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  • code to edit the text ib an EditText widgit

    - by user293663
    Hello, I am a newbi programmer and am having trouble with a measurement conversion program I am working on. What I would like to do is have several EditText boxes. When one is filled in and a calculate button is hit then the rest will be populated with a converted number. The part I am getting stuck on is outputting the answers to EditText widgets. ex: There are three EditText Widgets. a user inputs the number 6 into the first one (labeled inches) and presses calculate. I would like the next box to display .5 (labeled feet) and the last to display .1666 (this would be yards) .setText() apparently does not work to modify the text in an EditText any help would be greatly appreciated.

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  • How do I keep a scanner from throwing exceptions when the wrong type is entered? (java)

    - by David
    Here's some sample code: import java.util.Scanner; class In { public static void main (String[]arg) { Scanner in = new Scanner (System.in) ; System.out.println ("how many are invading?") ; int a = in.nextInt() ; System.out.println (a) ; } } if i run the program and give it an int like 4then everything goes fine. if, on the other hand, i answer too many it doesn't laugh at my funny joke. instead i get this: (as expected) Exception in thread "main" java.util.InputMismatchException at java.util.Scanner.throwFor(Scanner.java:819) at java.util.Scanner.next(Scanner.java:1431) at java.util.Scanner.nextInt(Scanner.java:2040) at java.util.Scanner.nextInt(Scanner.java:2000) at In.main(In.java:9) is there a way so that i can make it so that it either ignores entries that aren't ints or re prompts with "how many are invading?"? i'd like to know how to do both of these.

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  • Does Ruby on Rails "has_many" array provide data on a "need to know" basis?

    - by Jian Lin
    On Ruby on Rails, say, if the Actor model object is Tom Hanks, and the "has_many" fans is 20,000 Fan objects, then actor.fans gives an Array with 20,000 elements. Probably, the elements are not pre-populated with values? Otherwise, getting each Actor object from the DB can be extremely time consuming. So it is on a "need to know" basis? So does it pull data when I access actor.fans[500], and pull data when I access actor.fans[0]? If it jumps from each record to record, then it won't be able to optimize performance by doing sequential read, which can be faster on the hard disk because those records could be in the nearby sector / platter layer -- for example, if the program touches 2 random elements, then it will be faster just to read those 2 records, but what if it touches all elements in random order, then it may be faster just to read all records in a sequential way, and then process the random elements. But how will RoR know whether I am doing only a few random elements or all elements in random?

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  • Small Python optional arguments question

    - by ooboo
    I have two functions: def f(a,b,c=g(b)): blabla def g(n): blabla c is an optional argument in function f. If the user does not specify its value, the program should compute g(b) and that would be the value of c. But the code does not compile - it says name 'b' is not defined. How to fix that? Someone suggested: def g(b): blabla def f(a,b,c=None): if c is None: c = g(b) blabla But this doesn't work, because maybe the user intended c to be None and then c will have another value.

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  • Linking Libraries in Xcode

    - by Dan
    Hey all, I'm using a powerbook (osx 10.5) and recently downloaded and installed FFTW 3.2 (link text). I've been able to compile and run some simple programs based on the online tutorial using the terminal: g++ main.cpp -lfftw3 -lm however, I can't get the same program to compile in Xcode. I get a linking error, "symbol(s) not found". There is a file called libfftw3.a in /usr/local/lib. How can this be linked? Furthermore, apparently the libraries have to be linked in a particular order, i.e. see: link text thanks for any help

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  • NetBeans IDE 6.8 not working nicely with cygwin 1.7.5.1

    - by Milktrader
    I'm trying to use NetBeans to compile C code and have the following versions from cygwin gcc 3.4.5 g++ 3.4.5 GNU Make 3.81 GNU gdb 6.8.0 Here are the messages from trying to compile the Welcome program /usr/bin/make -f nbproject/Makefile-Debug.mk SUBPROJECTS= .build-conf make[1]: Entering directory `/cygdrive/c/Users/Milktrader/Documents/NetBeansProjects/Welcome_1' /usr/bin/make -f nbproject/Makefile-Debug.mk dist/Debug/MinGW-Windows/welcome_1.exe make[2]: Entering directory /cygdrive/c/Users/Milktrader/Documents/NetBeansProjects/Welcome_1' mkdir -p build/Debug/MinGW-Windows make[2]: mkdir: Command not found make[2]: *** [build/Debug/MinGW-Windows/welcome.o] Error 127 make[2]: Leaving directory/cygdrive/c/Users/Milktrader/Documents/NetBeansProjects Welcome_1' make[1]: * [.build-conf] Error 2 make[1]: Leaving directory `/cygdrive/c/Users/Milktrader/Documents/NetBeansProjects/Welcome_1' make: * [.build-impl] Error 2 BUILD FAILED (exit value 2, total time: 1s)\ Is it worth downloading a previous cygwin version (1.5)? Blog tutorials (including the NetBeans site) have this older version in their examples.

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  • How to break on unhandled exceptions in Silverlight

    - by Bruno Martinez
    In console .Net applications, the debugger breaks at the point of the throw (before stack unwinding) for exceptions with no matching catch block. It seems that Silverlight runs all user code inside a try catch, so the debugger never breaks. Instead, Application.UnhandledException is raised, but after catching the exception and unwinding the stack. To break when unhandled exceptions are thrown and not catched, I have to enable first chance exception breaks, which also stops the program for handled exceptions. Is there a way to remove the Silverlight try block, so that exceptions get directly to the debugger?

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  • WiX, how to prevent files from uninstalling though we forgot to set Permanent="yes"

    - by Doc Brown
    We have a product installer created with Wix, containing a program package ("V1") and some configuration files. Now, we are going to make a major upgrade with a new product code, where the old version of the product is uninstalled and "V2" is installed. What we want is to save one of the configuration files from uninstalling, since it is needed for the V2, too. Unfortunately, we forgot to set the Permanent="yes" option when we delivered V1 (read this question for more information). Here comes the question: is there an easy way of preventing the uninstall of the file anyhow? Of course, we could add a custom action to the script to backup the file before uninstallation, and another custom action to restore it afterwards, but IMHO that seems to be overkill for this task, and might interfere with other parts of the MSI registration process.

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  • PVM terminates after Adding Host

    - by Tyug
    On Ubuntu 9.10 using PVM 3.4.5-12 (the PVM package when you use apt-get) The program terminates after adding a host. laptop> pvm pvm> add bowtie-slave add bowtie-slave terminated laptop> Current Configuration only $PVM_RSH = bin/usr/ssh I can ssh perfectly fine into the slave without a password, and run commands on it. Any ideas? Thanks in advance! Here are the sample logs: Laptop log [t80040000] 02/11 10:23:32 laptop (127.0.1.1:xxxxx) LINUX 3.4.5 [t80040000] 02/11 10:23:32 ready Thu Feb 11 10:23:32 2010 [t80040000] 02/11 10:23:32 netoutput() sendto: errno=22 [t80040000] 02/11 10:23:32 em=0x2c24f0 [t80040000] 02/11 10:23:32 [49/à][6e/à][76/à][61/à][6c/à][69/à][64/à][20/à][61/à][72/à] [t80040000] 02/11 10:23:32 netoutput() sendto: Invalid argument [t80040000] 02/11 10:23:32 pvmbailout(0) bowtie-log [t80080000] 02/11 10:23:25 bowtie-slave (xxx.x.x.xxx:xxxxx) LINUX64 3.4.5 [t80080000] 02/11 10:23:25 ready Thu Feb 11 10:23:25 2010 [t80080000] 02/11 10:28:26 work() run = STARTUP, timed out waiting for master [t80080000] 02/11 10:28:26 pvmbailout(0)

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  • Does the order I declare pointers really matter in C? getcwd() problem...

    - by chucknelson
    On a Solaris 5.8 machine, I have the following code: [non-working code] char *buf; char *dir; size_t psize; psize = (size_t) 1024; dir = getcwd(buf, psize); On this unix machine, the above does not work and I get a segmentation fault when trying to run the program. It only works if I declare dir before buf: [working code] char *dir; char *buf; ... dir = getcwd(buf, psize); When using another flavor of Unix, such as Mac OS X, I don't get any of these what seem to be very strict rules on how to write the code. Can anyone explain what's going on with the above example? Thanks!

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  • iphone scanning a dat file for data

    - by Brodie4598
    I am trying to remake a program I have made in C# in OBJ-C.In C# I used streamreader to search the data file for the line I am looking for then convert that line into a string that I can work with. I have looked at NSScanner but I'm not sure if thats quite waht I'm looking for but I'm by no means a cocoa expert. All I would like to be able to do is have it search a data file for an occurance of a string, then when/if it finds an occurance of that string, it returns the line that string was found on as a string. Any ideas?

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  • Are there any modern platforms with non-IEEE C/C++ float formats?

    - by Patrick Niedzielski
    Hi all, I am writing a video game, Humm and Strumm, which requires a network component in its game engine. I can deal with differences in endianness easily, but I have hit a wall in attempting to deal with possible float memory formats. I know that modern computers have all a standard integer format, but I have heard that they may not all use the IEEE standard for floating-point integers. Is this true? While certainly I could just output it as a character string into each packet, I would still have to convert to a "well-known format" of each client, regardless of the platform. The standard printf() and atod() would be inadequate. Please note, because this game is a Free/Open Source Software program that will run on GNU/Linux, *BSD, and Microsoft Windows, I cannot use any proprietary solutions, nor any single-platform solutions. Cheers, Patrick

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  • Disconnect a bluetooth socket in Android

    - by rejoperejo
    Hi, I'm developing a program in which, from an Android Phone, I have to connect as a client to a Bluetooth medical sensor. I'm using the official Bluetooth API and no problem during connection (SPP profile), but when I end the socket, the sensor is still connected to my phone (although I have close the connection). Are there any way to make a Bluetooth disconnection? I think there is an intent called ACTION_ACL_CONNECTED, which does that. Can anyone explain me how to use this? Thanks in advance.

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  • HOw I can verify my SQL / SQL Pl syntax

    - by rima
    Hi all Sorry my English is bad.I hope u can get what I want. I have lots of *.sql files that i want to write a program to compile them and if there is any issue(problem or mistake) report me. One of my friend write an IDE for java,as I remember he use javac to generate the codes error,in other hand maybe u see when u try to write code in a Visual stadio or Netbean the IDE generate errors for u.so now I want to know any one have any idea how I can do it for my sql files? In other mean I want to write a Editor for SQL files(PL/SQL) that compile my code and tell me what is my error. this problem raise up when I try to compile all of them in SQL PLUS,it's so boring. please help me...

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  • how to send keystrokes to maplestory?

    - by blood
    hi i play a game called maplestory because a LOT of my friends do and i want to talk to them online and they will only chat on maplestory because they are playing it. i would like to build a program that will send my chats to maplestory and it will be a small little chat window because i can't do much well im chatting on Maplestory. i have tryed sending my fake input to maplestory but their anti-hack shield blocks it, i can't find a way by it with out running a by pass to their anti-hack shield which i don't really want to do :( so i need a way to send stuff by so i can chat. please don't tell me to use a by pass i really would like to find a way to leave it running. also i only really need keyboard input not really the mouse because to chat you only have to hit enter then type text then enter to send, but hey it might come in useful. also if the way only works for the top window i can just make something that swhitchs back and forth.

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  • Unable to remove package from Delphi 2005

    - by Robo
    I needed to reinstall a package, DrRX.bpl. I removed it from the package list, and trying to install a newer version of the same package. I've replaced the old component's dir with the new one. When I open the new DrRX.bpl and click install, I get the error "Package C:\Program Files\Borland\BDS\3.0\components\rx work\output\DrRx.bpl cannot be installed because another package with the same basename is already loaded (DrRx.bpl)" I cannot find any reference to DrRX in my package list, DrRX does not appear in the Tool Palette. How do I locate where Delphi thinks this is installed, and remove it, so I can reinstall the package?

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  • Using the value of a variable as another variables name in Ruby

    - by hrickards
    Hi, I'm just starting out in learning Ruby and I've written a program that generates some numbers and assigns them to variables @one, @two, @three etc. The user can then specify a variable to change by inputting it's name (e.g one). I then need to do something like '@[valueofinout] = asd'. How would I do this, and is there a better way as the way I'm thinking of seems to be discouraged? I've found x = "myvar" myvar = "hi" eval(x) -> "hi" but I don't completely understand why the second line is needed. In my case would I use something like @one = "21" input = "one" input = "@" + input changeto = "22" eval(input) -> changeto Thanks

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  • Making the shadow from a ScatterViewItem a different shape

    - by Vargen
    I am developing a program for Surface using Expression Blend and Visual Studio. I have a custom user control with an ellipse and a label in a grid. This will need to be placed in a scatterViewItem. My problem is that the scatterviewitem will cast a rectangle shaped shadow under the ellipse shaped content. I can disable the shadow completely, but is there any way to make the shadow inherit the shape from its parent? Or can i set the shape of the scatterviewItem itself in any way?

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  • Replace a word in an XML file through StreamReader in XNA?

    - by kcoppock
    Okay, so this is sort of a hack...but it may have to be. I'm writing an app in XNA, which from my research into this problem apparently doesn't support XML version 1.1. I'm reading in the contents of an ePub document, and one of the newer books contains its content directory as a version 1.1 XML document. This causes my program to crash. However, the structure is the same as the rest, the only thing that should be keeping it from working is the hard-coded "1.0" in the XmlDocument class. Is it possible that I could read in the file from the stream, see if it contains: <?xml version="1.1" encoding="UTF-8" standalone="no"?> and simply replace it with "1.0"? Then I could pull it in as an XmlDocument. I'm not doing any writing to the file, or any complex structural reading, just looking for a few specific nodes, and pulling in the values, so I don't know what the ramifications of this would be.

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  • Android: Saving custom button and spinner

    - by Jacob Huggart
    Hello All, I am new to Android programming and was handed a fairly large program that is almost complete, but needed support for switching between portrait and landscape view. I added android:configChanges="keyboardHidden|orientation" to the manifest and used onConfigurationChanged to save the view data and that works. However, there is a button that displays the date selected (when pressed a calendar to select the date comes up) and a spinner that displays the current view and is used to select a new view. Those two items are being cleared/reset and do not work at all after the screen flip. I have been attempting to use onSaveInstanceState and onRestoreInstanceState to fix that, but I cannot figure out how to get it to work. Any advice?

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  • iPhone: Chained views

    - by Michael
    I want to have dynamically created views and be able to scroll(change views like in camera roll) either from my program or user should also be able to do that. The views should contain only a simple text. Each view has to replace other, so they are like chained. The other example is the screenshots of applications in app store application details. I don't know which classes to check/start so if anyone can give me an idea of how this could be designed I would appreciate it.

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  • Flex Debugger wont launch - Only on particular project.

    - by John Isaacks
    When trying to launch Flex debaugger on my project, it does not launch and I get an error instead. Every other project in different workspaces launches just fine. This is the only one giving me an issue. Here is the error: Process terminated without establishing connection to debugger. Command: "C:\Program Files\Adobe\Flex Builder 3\sdks\3.2.0\bin\adl.exe" D:\fromLapTop\lapDocs\Flex\Workspaces\MothersRings\MothersRingsAir\bin-debug\MothersRingsAir-app.xml D:\fromLapTop\lapDocs\Flex\Workspaces\MothersRings\MothersRingsAir\bin-debug Output from command: PreloadSwf paths must be local trusted: D:/fromLapTop/lapDocs/Flex/Workspaces/WebRequestNotifier/.metadata/.plugins/com.adobe.flash.profiler/ProfilerAgent.swf?host=localhost&port=9999error while loading initial content Anyone have any ideas on how I can fix this? Thanks!

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  • Visual Studio 2008 Explicit Reference Error

    - by Alan
    I have a project which references a dll in the same solution (called "Common"). Common has two types of errors with the same names but different namespaces i.e. Common.Login.UserDeleted Common.Imaging.UserDeleted When I type UserDeleted visual studio recognizes both of these and asks for which it is ("ambiguous reference"). I right-click UserDeleted and select one of the two above, yet it then says that the type or reference doesn't exist! It doesn't make any sense. Why is this happening? I can't compile my program until I find a solution to this, thanks

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