using process to look for hwnd
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i use CreateToolhelp32Snapshot function to seach all the process id , but i can not use process id to look for the main frame hwnd!! can anyone tell me how to find that Thanks hi
Use
EnumWindowsto enumerate all top level windows. For each window enumerated use theGetWindowThreadProcessIdfunction to filter the windows to those belonging to the desired process. Steve -
Use
EnumWindowsto enumerate all top level windows. For each window enumerated use theGetWindowThreadProcessIdfunction to filter the windows to those belonging to the desired process. Steve -
There are a lot of hWnds in a top level window, such as Static, Button, EditBox etc. Using EnumWindow to look for hWnd wastes a lot of resources of system, and makes the system slowly. Can anybody give me a good idea!! thanks. hi
EnumWindowsonly enumerates top level windows. The procedure I outlined doesn't waste system resources - It's how it's done! Steve -
EnumWindowsonly enumerates top level windows. The procedure I outlined doesn't waste system resources - It's how it's done! Steve -
Here's an example that uses the technique: ------------------------------------------ // Win32App.cpp : Defines the entry point for the application. // #include "stdafx.h" #include #include #include #include typedef std::vector HWNDS; namespace { struct EnumInfo { DWORD dwProcessID; HWNDS *pHWNDS; }; BOOL CALLBACK EnumWindowsProc( HWND hWnd, LPARAM lParam ) { const EnumInfo *pInfo = reinterpret_cast(lParam); DWORD dwProcessID; GetWindowThreadProcessId(hWnd, &dwProcessID); if ( dwProcessID == pInfo->dwProcessID ) { pInfo->pHWNDS->push_back(hWnd); } return TRUE; } } BOOL GetProcessTopLevelWindows( DWORD dwProcessId, HWNDS *pOut ) { assert(pOut); EnumInfo ei = {dwProcessId, pOut}; return EnumWindows(&EnumWindowsProc, reinterpret_cast(&ei)); } struct ShowWindowTitle { bool operator()(HWND hWnd) const { int Len = GetWindowTextLength(hWnd); if ( Len>0 ) { char *pText = reinterpret_cast(_alloca(Len+1)); GetWindowText(hWnd, pText, Len+1); MessageBox(NULL, pText, "Window title", MB_OK); return true; } return false; } }; int APIENTRY WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow) { HWNDS wins; if ( GetProcessTopLevelWindows(2216, &wins) ) // PID HARDCODED! { std::for_each(wins.begin(), wins.end(), ShowWindowTitle()); } return 0; } Steve