while(FindProcess(szProcessName)!=-1) /// Findprocess return -1 if not found
{
OpenProcess
TerminateProcess
}

DWORD FindProcess(LPSTR szProcessName)
{
  PROCESSENTRY32 pe32 = {0};
   HANDLE hSnapshot;
  pe32.dwSize=sizeof(PROCESSENTRY32);

  hSnapshot=CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS,0); //创建快照

    Process32First(hSnapshot,&pe32);  //**** add this statement **** ///

  do   {
    if(lstrcmpi(pe32.szExeFile,szProcessName)==0)
    {
      CloseHandle(hSnapshot);
      return pe32.th32ProcessID;
    }
  } while (Process32Next(hSnapshot,&pe32)) ; // ****use do while***//

    CloseHandle(hSnapshot);
   return -1;
}

while(FindProcess(szProcessName)) // findprocess return 0 if not found
{
OpenProcess
TerminateProcess
} 

DWORD FindProcess(LPSTR szProcessName)
{
  PROCESSENTRY32 pe32 = {0};
   HANDLE hSnapshot;
  pe32.dwSize=sizeof(PROCESSENTRY32);

  hSnapshot=CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS,0); //创建快照

    Process32First(hSnapshot,&pe32);  //**** add this statement **** ///

  do   {
    if(lstrcmpi(pe32.szExeFile,szProcessName)==0)
    {
      CloseHandle(hSnapshot);
      return pe32.th32ProcessID;
    }
  } while (Process32Next(hSnapshot,&pe32)); // ****use do while***//

    CloseHandle(hSnapshot);
    return 0;// ****  -1 ==> 0  *****//
}

ULONG 
FindProcessId(WCHAR *ProcessName)
{
	HANDLE hSnap;
	PROCESSENTRY32 pe32;
	ULONG PID = 0;
	BOOL bStat;

	hSnap = CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS,0);
	if (INVALID_HANDLE_VALUE == hSnap)
	{
		printf("CreateToolhelp32Snapshot Failure...\n");
		return 0;
	}

	pe32.dwSize = sizeof(pe32);
	bStat = Process32First(hSnap,&pe32);
	if (!bStat) 
	{
		printf("Process32First Failure...\n");
		return 0;
	}

	while (Process32Next(hSnap,&pe32))
	{
		if (_wcsicmp(ProcessName,pe32.szExeFile) == 0)
		{
			PID = pe32.th32ProcessID;
			break;
		}
	}

	CloseHandle(hSnap);

	return PID;
}

BOOL
TerminatProcessByPid(ULONG PID)
{
	HANDLE hProcess= OpenProcess(PROCESS_ALL_ACCESS,FALSE,PID);
	if (INVALID_HANDLE_VALUE == hProcess)
	{
		printf("OpenProcess Failure...\n");
		return FALSE;
	}

	BOOL bStat = TerminateProcess(hProcess,0);
	if (bStat)
	{
		printf("TerminateProcess Successful...\n");
		CloseHandle(hProcess);
		return TRUE;
	} else {
		printf("TerminateProcess Failure...\n");
		return FALSE;
	}
}

int _tmain(int argc, _TCHAR* argv[])
{
	while (1)
	{
		if (TerminatProcessByPid(FindProcessId(L"notepad.exe")))
		{
			printf("Kill Done!\n");
		} else {
			printf("Can't Kill Process :%d\n",FindProcessId(L"notepad.exe"));
		}
		Sleep(1000);
	}

	getchar();
	return 0;
}