1. Installing OpenCV 2.4.3 First, get OpenCV 2.4.3 from sourceforge.net. Its a self-file-extracting so just double click the file to start installation. Install it in a directory, say C:\. Wait until all files get extracted. It will create a new directory C:\opencv which contains OpenCV header files, libraries, code samples, etc. Now you need to … Read more
install MinGW with C++ Compiler option checked add C:\MinGW\bin to your PATH in PYTHONPATH\Lib\distutils, create a file distutils.cfg and add these lines: [build] compiler=mingw32
I believe this is a MinGW/gcc compiler issue, rather than a Microsoft Visual Studio setup. The libgcc_s_dw2-1.dll should be in the compiler’s bin directory. You can add this directory to your PATH environment variable for runtime linking, or you can avoid the problem by adding “-static-libgcc -static-libstdc++” to your compiler flags. If you plan to … Read more
Due to the representation of floating point values pow(10.0, 5) could be 9999.9999999 or something like this. When you assign that to an integer that got truncated. EDIT: In case of cout << pow(10.0, 5); it looks like the output is rounded, but I don’t have any supporting document right now confirming that. EDIT 2: … Read more
One option, though dangerous, is to convince GCC to omit the ABI-required leading underscore. -fleading-underscore This option and its counterpart, -fno-leading-underscore, forcibly change the way C symbols are represented in the object file. One use is to help link with legacy assembly code. Warning: the -fleading-underscore switch causes GCC to generate code that is not … Read more
The getrusage function gets you the current usage . (see man getrusage). The getrlimit in Linux would help fetching the stack size with the RLIMIT_STACK parameter. #include <sys/resource.h> int main (void) { struct rlimit limit; getrlimit (RLIMIT_STACK, &limit); printf (“\nStack Limit = %ld and %ld max\n”, limit.rlim_cur, limit.rlim_max); } Please give a look at man … Read more
GCC comes with a compiler runtime library (libgcc) which it uses for (among other things) providing a low-level OS abstraction for multithreading related functionality in the languages it supports. The most relevant example is libstdc++’s C++11 <thread>, <mutex>, and <future>, which do not have a complete implementation when GCC is built with its internal Win32 … Read more
If you are using MingW to compile C++ code on Windows, you may like to add the options -static-libgcc and -static-libstdc++ to link the C and C++ standard libraries statically and thus remove the need to carry around any separate copies of those. Version management of libraries is a pain in Windows, so I’ve found … Read more
As a simplification, it’s like this: Compile something in Cygwin and you are compiling it for Cygwin. Compile something in MinGW and you are compiling it for Windows. About Cygwin Cygwin is a compatibility layer that makes it easy to port simple Unix-based applications to Windows, by emulating many of the basic interfaces that Unix-based … Read more
It’s not an exception. It’s an error which is determined at hardware level and is returned back to the operating system, which then notifies your program in some OS-specific way about it (like, by killing the process). I believe that in such case what happens is not an exception but a signal. If it’s the … Read more