Ok, this probably has a really simple answer, but I've never tried to do it before: How do you launch a web page from within an app? You know, "click here to go to our FAQ", and when they do it launches their default web browser and goes to your page. I'm working in C/C++ in Windows, but if there's a broader, more portable way to do it I...
Do you have any sugestions of tools to ease the task of understanding C/C++ code? We just inherited a large piece of software written by others and we need to quickly get up to speed on it. Any advice on tools that might simplify this task? ...
I'm working on a loosely coupled cluster for some data processing. The network code and processing code is in place, but we are evaluating different methodologies in our approach. Right now, as we should be, we are I/O bound on performance issues, and we're trying to decrease that bottleneck. Obviously, faster switches like Infiniband wo...
I'm trying to find a good way to print leading 0's, such as 01001 for a zipcode. While the number would be stored as 1001, what is a good way to do it? I thought of using either case statements/if then to figure out how many digits the number is and then convert it to an char array with extra 0's for printing but I can't help but think...
I’m trying to debug a memory leak problem. I’m using mtrace() to get a malloc/free/realloc trace. I’ve ran my prog and have now a huge log file. So far so good. But I have problems interpreting the file. Look at these lines: @ /usr/java/ibm-java2-x86_64-50/jre/bin/libj9prt23.so:[0x2b270a384a34] + 0x1502570 0x68 @ /usr/java/ibm-java2-x86...
In many C/C++ macros I'm seeing the code of the macro wrapped in what seems like a meaningless do while loop. Here are examples. #define FOO(X) do { f(X); g(X); } while (0) #define FOO(X) if (1) { f(X); g(X); } else I can't see what the do while is doing. Why not just write this without it? #define FOO(X) f(X); g(X) ...
Ok, this is a bit of a cheeky question. I want to build a simple text editor (using my own text mode screen handling). I just want a good example of data structures that can be used to represent the text buffer, and some simple examples of char/text insertion/deletion. I can handle all the rest of the code myself (file i/o, console i/o e...
We have some old C code here that's built with nmake. Is there an automated way to pull the Makefile into Visual Studio 2005 and create a project? Some searching on MSDN indicates VS6 could do this, but it looks like VS7/8 dropped the feature. If necessary I can build the project from scratch using the project.mak file as a reference, ...
Other than -Wall what other warnings have people found useful? http://gcc.gnu.org/onlinedocs/gcc-4.3.2/gcc/Warning-Options.html ...
I wrote a program in C with Ubuntu Linux and now I need to port it over to a UNIX machine (or what I believe to be a UNIX box). It compiles fine on my Ubuntu with GCC but when I try to compile it with GCC on the UNIX box, it gives this error: a.c: In function `goUpDir': a.c:44: parse error before `char' a.c:45: `newDir' undeclared (fir...
I have a double value f and would like a way to nudge it very slightly larger (or smaller) to get a new value that will be as close as possible to the original but still strictly greater than (or less than) the original. It doesn't have to be close down to the last bit—it's more important that whatever change I make is guaranteed to pro...
I have an application that launches a webpage in the "current" browser when the user selects it. This part of my app works fine in the Windows version but I can't figure out how to do this in Linux build. Right now the Linux version is hardcoded for Firefox in a specific directory and runs a new instance of it each time and doesn't show...
Yet again, my teacher was unable to answer my question. I knew who may be able to... So, I've never really learned C. In C++, I would, obviously, use a cout statement all of the time. In a recent assignment, my teacher told us to make sure to put setbuf( stdout , NULL ); at the top of main() in order to get an unbuffered output, thu...
I have a LAMP (PHP) web app which need to interface with programs on an IBM 3270 mainframe (via Microsoft SNA Server). One solution I'm looking at is screen-scraping via 3270. (I'm integrating the present with the past!) Many years ago, I wrote C code which used HLLAPI as the basis for such a task. Is HLLAPI still the best way to ap...
After following the instructions in INSTALL.W64 I have two problems: The code is still written to the "out32" folder. I need to be able to link to both 32-bit and 64-bit versions of the library on my workstation, so I don't want the 64-bit versions to clobber the 32-bit libs. The output is still 32-bit! This means that I get "unresolve...
So I have a daemon running on a linux system, and I want to have a record of its activities: a log. The question is, what is the "best" way to accomplish this? My first idea is to simply open a file and write to it. FILE* log = fopen("logfile.log", "w"); /* daemon works...needs to write to log */ fprintf(log, "foo%s\n", (char*)bar); /*...
I was wonder if any knows how to open up a windows *.dmp file after a application crash written C/C++. ...
It looks like some work has been done to make pthread-win32 work with x64, but there are no build instructions. I have tried simly building with the Visual Studio x64 Cross Tools Command Prompt, but when I try to link to the lib from an x64 application, it can't see any of the function exports. It seems like it is still compiling the lib...
This seems like a pretty softball question, but I always have a hard time looking up this function because there seem there are so many variations regarding the referencing of char and tchar. ...
Hi, After I call getpwuid(uid), I have a reference to a pointer. Should I free that when I don't use it anymore? Reading the man pages, it says that it makes reference to some static area, that may be overwritten by subsequent calls to the same functions, so I'm sure sure if I should touch that memory area. Thanks. ...