通过进程名获得进程ID

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#include<windows.h>
#include<iostream>
#include<tlhelp32.h>
#include<TCHAR.h>
using namespace std;
HANDLE GetProcessHandle(int nID)//通过进程ID获取进程句柄
{
    return OpenProcess(PROCESS_ALL_ACCESS, FALSE, nID);
}
HANDLE GetProcessHandle(LPCTSTR pName)//通过进程名获取进程句柄
{
    HANDLE hSnapshot = CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);
    if (INVALID_HANDLE_VALUE == hSnapshot) {
        return NULL;
    }
    PROCESSENTRY32 pe = { sizeof(pe) };
    BOOL fOk;
    for (fOk = Process32First(hSnapshot, &pe); fOk; fOk = Process32Next(hSnapshot, &pe)) {
        if (!_tcscmp(pe.szExeFile, pName)) {
            CloseHandle(hSnapshot);
            return GetProcessHandle(pe.th32ProcessID);
        }
    }
    return NULL;
}
int main()
{
    HANDLE h=GetProcessHandle("taskmgr.exe");
    if(h==NULL)
    {
        printf("no");
    }
    else 
    {
        printf("yes");
    }
    return 0;
}