WINDOWS API ——CREATETOOLHELP32SNAPSHOT——查找进程

原文：http://www.cnblogs.com/wind-net/archive/2012/10/26/2741458.html

//根据进程名获取进程ID
DWORD GetPidByProcessName(TCHAR *pProcess) 
{ 
HANDLE hSnapshot; 
PROCESSENTRY32 lppe; 
//创建系统快照 
hSnapshot = ::CreateToolhelp32Snapshot(TH32CS_SNAPPROCESS, NULL); //#include<Tlhelp32.h>

if (hSnapshot == NULL) 
return 0;

//初始化 lppe 的大小 
lppe.dwSize = sizeof(lppe);

//查找第一个进程 
if (!::Process32First(hSnapshot, &lppe))
return false; 
do 
{ 
if(StrCmp(lppe.szExeFile, pProcess) == 0)//#include<shlwapi.h>
{ 
return lppe.th32ProcessID;
} 
} 
while (::Process32Next(hSnapshot, &lppe)); //查找下一个进程

return 1;
}

//根据进程ID获取窗口句柄
HWND GetHwndByPid(DWORD dwProcessID)
{
//返回Z序顶部的窗口句柄
HWND hWnd = ::GetTopWindow(0);

while ( hWnd )
{
DWORD pid = 0;
//根据窗口句柄获取进程ID
DWORD dwTheardId = ::GetWindowThreadProcessId( hWnd,&pid);

if (dwTheardId != 0)
{
if ( pid == dwProcessID )
{
return hWnd;
}
}
//返回z序中的前一个或后一个窗口的句柄
hWnd = ::GetNextWindow(hWnd , GW_HWNDNEXT);

}
return hWnd;
}

//前端显示并置顶窗口
void ShowForeGround(HWND hWnd)
{

if (hWnd)
{
//显示窗口
::ShowWindow(hWnd, SW_NORMAL);

//前端显示
::SetForegroundWindow(hWnd);

//窗口置顶
::SetWindowPos(hWnd,HWND_TOPMOST,0,0,0,0,SWP_NOMOVE|SWP_NOSIZE);
}
else
{
::MessageBox(NULL, _T("未找到窗口"), _T("提示"),MB_OK);
}
}

void CMFCApplication1Dlg::OnBnClickedMfcbutton1()
{
// TODO: 在此添加控件通知处理程序代码
DWORD dwPid = GetPidByProcessName(_T("notepad.exe"));
HWND hWnd = GetHwndByPid(dwPid);
ShowForeGround(hWnd);
}