我是Win32 API的初學者,但我對C++有着豐富的經驗。爲了學習目的,我根據參考資料,教程和示例創建了一個非常簡單的Win32應用程序。如何防止Win32應用程序在主窗口關閉後在後臺運行?
問題是,在主窗口關閉後,其進程仍在後臺運行。我怎樣才能防止這一點?在我的WndProc函數中,我確實有一個使用DestroyWindow的WM_DESTROY案例,但它似乎並沒有做到這一點。代碼如下:
#include <cstdio>
#include <cstdlib>
#ifdef UNICODE
#include <tchar.h>
#endif
#include <Windows.h>
HINSTANCE hinst;
HWND hwnd;
LRESULT CALLBACK WndProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam);
#ifdef UNICODE
int WINAPI _tWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPTSTR lpCmdLine, int nCmdShow)
#else
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
#endif
{
MSG msg;
WNDCLASSEX mainclass;
BOOL bRet;
UNREFERENCED_PARAMETER(lpCmdLine);
mainclass.cbSize = sizeof(WNDCLASSEX);
mainclass.style = CS_VREDRAW | CS_HREDRAW;
mainclass.lpfnWndProc = (WNDPROC) WndProc;
mainclass.cbClsExtra = NULL;
mainclass.cbWndExtra = NULL;
mainclass.hInstance = hInstance;
mainclass.hIcon = NULL;
mainclass.hCursor = LoadCursor(NULL, IDC_ARROW);
mainclass.hbrBackground = (HBRUSH) COLOR_WINDOW;
mainclass.lpszMenuName = NULL;
mainclass.lpszClassName = TEXT("MainWindowClass");
mainclass.hIconSm = NULL;
if (!RegisterClassEx(&mainclass))
return FALSE;
hinst = hInstance;
hwnd = CreateWindowEx(
WS_EX_WINDOWEDGE,
TEXT("MainWindowClass"),
TEXT("Test Window"),
WS_CAPTION | WS_VISIBLE | WS_SIZEBOX | WS_SYSMENU | WS_MINIMIZEBOX | WS_MAXIMIZEBOX,
CW_USEDEFAULT,
CW_USEDEFAULT,
CW_USEDEFAULT,
CW_USEDEFAULT,
NULL,
NULL,
hinst,
NULL);
ShowWindow(hwnd, nCmdShow);
UpdateWindow(hwnd);
while ((bRet = GetMessage(&msg, NULL, 0, 0)) != 0)
{
if (bRet != -1)
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
}
return (int) msg.wParam;
}
LRESULT CALLBACK WndProc(HWND hwnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
PAINTSTRUCT ps;
switch(uMsg)
{
case WM_DESTROY:
DestroyWindow(hwnd);
break;
case WM_PAINT:
BeginPaint(hwnd, &ps);
EndPaint(hwnd, &ps);
break;
default:
return DefWindowProc(hwnd, uMsg, wParam, lParam);
}
return 0;
}
您可以使用調試器來幫助您。當您關閉主窗口並且程序仍在運行時,請暫停執行並查看調用堆棧以瞭解您的程序仍在忙於什麼。這可以爲您提供線索,瞭解您的程序希望您如何使其停止運行。例如,如果您發現程序仍在運行消息循環,則可以安排循環的終止條件得到滿足。 – 2012-03-05 18:14:49
這是一個更好的參考/教程/例子:[Raymond Chen的C++ scratch程序](http://blogs.msdn.com/b/oldnewthing/archive/2005/04/22/410773.aspx)。這裏是[C scratch程序的鏈接](http://blogs.msdn.com/b/oldnewthing/archive/2003/07/23/54576.aspx)。 – 2012-03-05 19:24:37