To get information about the number of processor cores in the system, you may use the Windows environment variable NUMBER_OF_PROCESSORS. Below is a fragment of C++ code where the WinAPI GetEnvironmentVariable method is used to extract and display the contents of this environment variable.
#include <windows.h>
#include <tchar.h>
#include <stdio.h>
#define VARNAME TEXT("NUMBER_OF_PROCESSORS")
#define BUFSIZE 4096
int main()
{
TCHAR buf[BUFSIZE];
DWORD dwRet = GetEnvironmentVariable(VARNAME, buf, BUFSIZE);
if (dwRet > 0 && dwRet < BUFSIZE)
_tprintf(_T("Number of processors: %s\n"), buf);
return 0;
}
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