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How to check Windows or process is 64bit

typedef BOOL (WINAPI *LPFN_ISWOW64PROCESS) (HANDLE, PBOOL);
bool Is64BitWindows()
{
#if defined(_WIN64)
	return true;  // 64-bit programs run only on Win64
#elif defined(_WIN32)
 
	// 32-bit programs run on both 32-bit and 64-bit Windows
	// so must sniff
	BOOL f64 = FALSE;
	LPFN_ISWOW64PROCESS fnIsWow64Process;
 
	fnIsWow64Process = (LPFN_ISWOW64PROCESS)GetProcAddress(GetModuleHandle(TEXT("kernel32")), "IsWow64Process");
	if (NULL != fnIsWow64Process)
	{
		return !!(fnIsWow64Process(GetCurrentProcess(), &f64) && f64);
	}
 
	return false;
#else
	return false; // Win64 does not support Win16
#endif
}

http://stackoverflow.com/questions/336633/how-to-detect-windows-64-bit-platform-with-net

Other functions, for finding CPU and whether the process is 64bit.

typedef void(WINAPI *LPFN_GetNativeSystemInfo)(LPSYSTEM_INFO);
LPCWSTR GetPlatformW()
{
	static WCHAR sT[64];
	static bool done = false;
	if (done)
		return sT;
 
	LPFN_GetNativeSystemInfo fnGetNativeSystemInfo = (LPFN_GetNativeSystemInfo)GetProcAddress(
		GetModuleHandle(TEXT("kernel32")), "GetNativeSystemInfo");
 
	if (NULL == fnGetNativeSystemInfo)
	{
		lstrcpy(sT, L"Unknown");
	}
	else
	{
		SYSTEM_INFO si = { 0 };
		fnGetNativeSystemInfo(&si);
		switch (si.wProcessorArchitecture)
		{
		case PROCESSOR_ARCHITECTURE_AMD64:	lstrcpy(sT, L"AMD64");	break;
		case PROCESSOR_ARCHITECTURE_ARM:	lstrcpy(sT, L"ARM");	break;
		case PROCESSOR_ARCHITECTURE_IA64:	lstrcpy(sT, L"IA64");	break;
		case PROCESSOR_ARCHITECTURE_INTEL:	lstrcpy(sT, L"INTEL");	break;
		default:lstrcpy(sT, L"Unknown"); break;
		}
	}
	return sT;
}
 
bool Is64BitProcess()
{
#if defined(_WIN64)
	return true;
#else
	return false;
#endif
}

I tried to run this code only on AMD64. I don’t know what happens in ARM or IA64 platforms.