根据进程名称获取窗口句柄

// WinWnd.cpp : 定义 DLL 应用程序的导出函数。
//

#include "stdafx.h"
#include "WinWnd.h"
#include<stdio.h>
#include<Windows.h>
#include<TlHelp32.h>
#include<iostream>

using namespace std;
typedef struct tagWNDINFO
{
	DWORD dwProcessId;
	HWND hWnd;
} WNDINFO, *LPWNDINFO;



//2.枚举所有进程

BOOL CALLBACK MyEnumProc(HWND hWnd, LPARAM lParam)//枚举所有进程
{
	DWORD dwProcId;
	GetWindowThreadProcessId(hWnd, &dwProcId);
	LPWNDINFO pInfo = (LPWNDINFO)lParam;
	//cout << "dwProcId:" << dwProcId << " pInfo->dwProcessId:" << pInfo->dwProcessId << endl;
	if (dwProcId == pInfo->dwProcessId)
	{

		HWND p = GetParent(hWnd);
		HWND ph = GetParent(p);
		if (ph != 0) {
			pInfo->hWnd = ph;
			return FALSE;
		}

	}

	return TRUE;
}



//3.获取给定进程ID的窗口handle

HWND GetProcessMainWnd(DWORD dwProcessId)//获取给定进程ID的窗口handle
{
	WNDINFO wi;
	wi.dwProcessId = dwProcessId;
	wi.hWnd = NULL;
	EnumWindows(MyEnumProc, (LPARAM)&wi);

	return wi.hWnd;
}

HWND GetWndHwnd(char *strExeName)
{
	PROCESSENTRY32 pe32;
	//在使用这个结构前，先设置它的大小  
	pe32.dwSize = sizeof(pe32);
	//给系统内所有的进程拍个快照  
	HANDLE hProcessSnap = ::CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, 0);
	if (hProcessSnap == INVALID_HANDLE_VALUE)
	{
		//printf("CreateToolhelp32Snapshot 调用失败.\n");  
		return NULL;
	}
	//遍历进程快照，轮流显示每个进程的信息  
	BOOL bMore = ::Process32First(hProcessSnap, &pe32);
	while (bMore)
	{
		//if(pe32.szExeFile == exeName)//找到了进程
		if (strcmp(_strdup(pe32.szExeFile), strExeName) == 0)
		{

			HWND game_window_hwnd = GetProcessMainWnd(pe32.th32ProcessID);
			if (NULL != game_window_hwnd)
			{
				::CloseHandle(hProcessSnap);
				return game_window_hwnd;
			}
		}
		bMore = ::Process32Next(hProcessSnap, &pe32);
	}
	//不要忘记清除掉snapshot对象  
	::CloseHandle(hProcessSnap);
	return NULL;
}


int GetWndFromPid(char * proName)
{
	return int(GetWndHwnd(proName));
}

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