C++根据进程获取主窗口的句柄

// processenum.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include <Windows.h>
#include <stdio.h>
#include <tchar.h>
#include <Psapi.h>
#include <string.h>
#pragma comment ( lib, "Psapi.lib" )

HWND lmshwnd;

BOOL CALLBACK EnumWindowsProc(HWND hwnd,DWORD lParam)
{
DWORD mpid;
GetWindowThreadProcessId(hwnd,&mpid);

if (mpid==lParam)
{
int i=GetWindowTextLength(hwnd);
char szhello[255];
char lmschar[255]=_T("名称");
GetWindowText(hwnd,szhello,i+1);
if (strstr(szhello,lmschar))
{
printf("%s\n",szhello);
lmshwnd=hwnd;
}

}
return TRUE;
}

void PrintProcessNameAndID( DWORD processID )
{
TCHAR szProcessName[MAX_PATH] = TEXT("unknow");
//根据进程ID,打开进程返回进程的句柄
HANDLE hProcess = OpenProcess( PROCESS_QUERY_INFORMATION|PROCESS_VM_READ,FALSE,processID );
//得到进程名
if (NULL!=hProcess )
{
HMODULE hMod;
DWORD cbNeeded;
//EnumProcessModules根据句柄获取实例，保存到hMod中
if (EnumProcessModules( hProcess,&hMod,sizeof(hMod),&cbNeeded) )
{
//获取根据进程句柄获取进程名称 szProcessName
GetModuleBaseName( hProcess, hMod, szProcessName,sizeof(szProcessName)/sizeof(TCHAR) );
}
}
//打印进程名和进程ID,其进程句柄为hProcess
TCHAR *lmsname=TEXT("LMSVirtualLab.EXE");
if (!strcmp(szProcessName,lmsname))
{
_tprintf( TEXT("%s (PID: %x)\n"),szProcessName,processID);
EnumWindows((WNDENUMPROC)EnumWindowsProc,processID);
//HDESK hDesk=OpenDesktop(_T(""),0,FALSE,DESKTOP_ENUMERATE);
//EnumDesktopWindows(hDesk,(WNDENUMPROC)EnumWindowsProc,processID);
}

CloseHandle( hProcess );
}

int _tmain(int argc, _TCHAR* argv[])
{
// 得到进程ID的列表
DWORD aProcesses[1024], cbNeeded, cProcesses;
unsigned int i;
//列举所有进程的ID，返回到aProcesses数组中
if ( !EnumProcesses( aProcesses, sizeof(aProcesses), &cbNeeded ) )
return 0;
//计算一共返回了多少个进程ID
cProcesses = cbNeeded / sizeof(DWORD);
//打印每个进程的名称和对应的ID
for ( i = 0; i < cProcesses; i++ )
{
if( aProcesses[i] != 0 )
{
PrintProcessNameAndID(aProcesses[i]);
}
}
printf("%x\n",lmshwnd);
ShowWindow(lmshwnd,SW_MAXIMIZE);
return 0;
}