windows c++ 根据进程名获取进程全路径

       代码有些拙略，能够根据进程名字获取进程的全路径。但是以32位编译的代码不能获取64位进程信息，GetLastError等于299。

#include <Windows.h>
#include <TlHelp32.h>
#include <iostream>
#include <conio.h>

using namespace std;

char* GetProcessPath(char* szProcessName)
{
    PROCESSENTRY32 pe32;
    pe32.dwSize = sizeof(pe32);

    HANDLE hSnapShot = CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);
    if (hSnapShot == INVALID_HANDLE_VALUE)
    {
        cout << "CreateToolhelp32Snapshot Error" << endl;
        return "";
    }

    BOOL bRet = Process32First(hSnapShot, &pe32);
    while(bRet)
    {
        if (_strnicmp(szProcessName, pe32.szExeFile, strlen(szProcessName)) == 0)
        {
            hSnapShot = CreateToolhelp32Snapshot(TH32CS_SNAPMODULE, pe32.th32ProcessID);
            if (hSnapShot == INVALID_HANDLE_VALUE)
            {
                DWORD dwErr = GetLastError();
                cout << "CreateToolhelp32Snapshot Error: " << dwErr << endl;
                return "";
            }
            MODULEENTRY32 me32;
            me32.dwSize = sizeof(MODULEENTRY32);

            if (!Module32First(hSnapShot, &me32))
            {
                DWORD dwErr = GetLastError();
                cout << "Module32First error:" << dwErr << endl;
                return "";
            }
            cout << "ProcessPath = " << me32.szExePath << endl;
            return me32.szExePath;
        }
        bRet = ::Process32Next(hSnapShot, &pe32);
    }
}

void main()
{
    char szProcessName[MAX_PATH];
    cin >> szProcessName;
    GetProcessPath(szProcessName);
    _getch();
}