Windows Process List - Win32 code in C to retrieve the list of the processes using the CreateToolhelp32Snapshot() function

winproclist.c

#include <windows.h>
#include <tlhelp32.h>
#include <tchar.h>

void PrintHeader()
{
	_tprintf(TEXT("%10s %40s\n"), TEXT("Process ID"), TEXT("Process Name"));
}

void PrintProcessEntry(PROCESSENTRY32 pe)
{
	_tprintf(TEXT("%10d %40s\n"), pe.th32ProcessID, pe.szExeFile);
}

int main()
{
	HANDLE processSnapshotHandle;
	PROCESSENTRY32 processEntry;
	processSnapshotHandle = CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);
	if (processSnapshotHandle != INVALID_HANDLE_VALUE)
	{
		processEntry.dwSize = sizeof(PROCESSENTRY32);
		if (Process32First(processSnapshotHandle, &processEntry))
		{
			PrintHeader();
			PrintProcessEntry(processEntry);
			while (Process32Next(processSnapshotHandle, &processEntry))
				PrintProcessEntry(processEntry);
		}
		CloseHandle(processSnapshotHandle);
	}
	return 0;
}