C DestroyWindow()未销毁子窗口
C DestroyWindow()未销毁子窗口,c,winapi,C,Winapi,WndProc是主窗口的窗口过程ChildProc是子窗口的窗口过程ChildProc未接收到WM\u DESTROY。我做错了什么 编辑:如果我从hChild=CreateWindowExW(…)中删除WS_子窗口window样式0) { 翻译信息(&msg); DispatchMessageW(&msg); } 返回(int)msg.wParam; } 当您调用DestroyWindow(假设具有有效的窗口句柄)-当然,所有子窗口都将被销毁。当然,所有子窗口都收到了WM\u DESTROY
WndProc
是主窗口的窗口过程ChildProc
是子窗口的窗口过程ChildProc
未接收到WM\u DESTROY
。我做错了什么
编辑:如果我从hChild=CreateWindowExW(…)中删除WS_子窗口window样式所以它是hChild=CreateWindowExW(…,WS_可见,…)代码>我确实在ChildProc
中得到了WM\u DESTROY
另外,我正在使用Windows10和VisualStudio2008
#include <windows.h>
HINSTANCE g_hInst;
LRESULT CALLBACK ChildProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
switch(msg)
{
case WM_PAINT:
{
HDC hdc;
PAINTSTRUCT ps;
hdc = BeginPaint(hwnd, &ps);
if(hdc)
{
RECT rc;
GetClientRect(hwnd, &rc);
SetBkMode(hdc, TRANSPARENT);
FillRect(hdc, &rc, GetSysColorBrush(COLOR_GRAYTEXT));
TextOut(hdc, 0, 0, TEXT("Child"), 5);
EndPaint(hwnd, &ps);
}
}
break;
case WM_DESTROY:
MessageBoxW(0, L"Child WM_DESTROY", 0, MB_OK);
break;
default:
return DefWindowProcW(hwnd, msg, wParam, lParam);
}
return 0;
}
LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
static HWND hChild;
switch(msg)
{
case WM_CREATE:
{
WNDCLASSEXW wc;
SecureZeroMemory(&wc, sizeof(WNDCLASSEXW));
wc.cbSize = sizeof(WNDCLASSEXW);
wc.hCursor = LoadCursorW(0, IDC_ARROW);
wc.hInstance = g_hInst;
wc.lpfnWndProc = ChildProc;
wc.lpszClassName = L"Childclass////";
if(!RegisterClassExW(&wc)) return -1;
hChild = CreateWindowExW(0, L"Childclass////", 0, WS_VISIBLE | WS_CHILD,
0, 0, 200, 100, hwnd, 0, g_hInst, 0);
if(!hChild) return -1;
}
break;
case WM_DESTROY:
PostQuitMessage(0);
break;
default:
return DefWindowProcW(hwnd, msg, wParam, lParam);
}
return 0;
}
int WINAPI wWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPWSTR lpCmdLine, int nCmdShow)
{
WNDCLASSEXW wc;
HWND hwnd;
MSG msg;
SecureZeroMemory(&wc, sizeof(WNDCLASSEXW));
wc.cbSize = sizeof(WNDCLASSEXW);
wc.hbrBackground = (HBRUSH)(COLOR_WINDOW + 1);
wc.hCursor = LoadCursorW(0, IDC_ARROW);
wc.hIcon = LoadIconW(0, IDI_APPLICATION);
wc.hInstance = hInstance;
wc.lpfnWndProc = WndProc;
wc.lpszClassName = L"Mainclass";
if(!RegisterClassExW(&wc)) return 0;
g_hInst = hInstance;
hwnd = CreateWindowExW(0, L"Mainclass", L"Main window", WS_OVERLAPPEDWINDOW, 240, 240, 400, 200, 0, 0, hInstance, 0);
if(!hwnd) return 0;
ShowWindow(hwnd, nCmdShow);
UpdateWindow(hwnd);
while(GetMessageW(&msg, 0, 0, 0) > 0)
{
TranslateMessage(&msg);
DispatchMessageW(&msg);
}
return (int)msg.wParam;
}
#包括
辛辛斯特;
LRESULT回调ChildProc(HWND HWND,UINT msg,WPARAM WPARAM,LPARAM LPARAM)
{
开关(msg)
{
案例WM_油漆:
{
HDC-HDC;
PAINTSTRUCT-ps;
hdc=开始喷漆(hwnd和ps);
如果(hdc)
{
RECT-rc;
GetClientRect(hwnd和rc);
SetBkMode(hdc,透明);
FillRect(hdc,&rc,getsyscolorbush(COLOR_GRAYTEXT));
文本输出(hdc,0,0,文本(“子”),5);
端漆(hwnd和ps);
}
}
打破
案例WM_销毁:
MessageBoxW(0,L“子WM_DESTROY”,0,MB_OK);
打破
违约:
返回DefWindowProcW(hwnd、msg、wParam、lParam);
}
返回0;
}
LRESULT回调WndProc(HWND HWND,UINT msg,WPARAM WPARAM,LPARAM LPARAM)
{
静态HWND-hChild;
开关(msg)
{
案例WM_创建:
{
WNDCLASSEXW wc;
SecureZeroMemory(&wc,sizeof(WNDCLASSEXW));
wc.cbSize=sizeof(WNDCLASSEXW);
wc.hCursor=LoadCursorW(0,IDC_箭头);
wc.hInstance=g_hInst;
wc.lpfnWndProc=ChildProc;
wc.lpszClassName=L“Childclass//”;
if(!RegisterClassExW(&wc))返回-1;
hChild=CreateWindowExW(0,L“Childclass//”,0,WS_可见| WS_CHILD,
0,0,200,100,hwnd,0,g_hInst,0);
如果(!hChild)返回-1;
}
打破
案例WM_销毁:
PostQuitMessage(0);
打破
违约:
返回DefWindowProcW(hwnd、msg、wParam、lParam);
}
返回0;
}
int WINAPI wWinMain(HINSTANCE HINSTANCE、HINSTANCE hPrevInstance、LPWSTR lpCmdLine、int nCmdShow)
{
WNDCLASSEXW wc;
HWND-HWND;
味精;
SecureZeroMemory(&wc,sizeof(WNDCLASSEXW));
wc.cbSize=sizeof(WNDCLASSEXW);
wc.hbrBackground=(HBRUSH)(彩色窗口+1);
wc.hCursor=LoadCursorW(0,IDC_箭头);
wc.hIcon=LoadIconW(0,IDI_应用);
wc.hInstance=hInstance;
wc.lpfnWndProc=WndProc;
wc.lpszClassName=L“Mainclass”;
如果(!RegisterClassExW(&wc))返回0;
g_hInst=hInstance;
hwnd=CreateWindowExW(0,L“Mainclass”,L“Main window”,WS_OVERLAPPEDWINDOW,240,240,400,200,0,0,hInstance,0);
如果(!hwnd)返回0;
显示窗口(hwnd、nCmdShow);
更新窗口(hwnd);
while(GetMessageW(&msg,0,0,0)>0)
{
翻译信息(&msg);
DispatchMessageW(&msg);
}
返回(int)msg.wParam;
}
当您调用DestroyWindow
(假设具有有效的窗口句柄)-当然,所有子窗口都将被销毁。当然,所有子窗口都收到了WM\u DESTROY
ChildProc未接收到WM\u DESTROY
这是错误的。我绝对肯定它收到了
我做错了什么
调试诊断并从错误位置调用PostQuitMessage
您决定ChildProc“未接收”WM_DESTROY
,只是因为您未查看消息框。但如果您调用PostQuitMessage(0),它甚至会在显示之前关闭在它之前编码>
当一个窗口被销毁时,WM_DESTROY
首先被发送到拥有的窗口(如果有),然后发送到被销毁的窗口,最后发送到子窗口(如果有)
因此,如果您使用子窗口-收到的第一个父窗口WM_DESTROY
,您调用PostQuitMessage
,然后子窗口调用MessageBox
,该子窗口刚刚返回,没有显示之前的PostQuitMessage
调用
如果您使用自有窗口-它首先接收WM_DESTROY
并显示MessageBox
normal。只有在您关闭它之后,父窗口才能接收WM_DESTROY
最终并调用PostQuitMessage
要解决此问题,首先需要从WM\u NCDESTROY
调用PostQuitMessage
-父窗口在所有拥有的和子窗口之后接收此消息
第二步,MessageBox
不是调试诊断的最佳选择。最好在调试器中使用DbgPrint
、OutputDebugString
或断点
感谢@RemyLebeau链接到Raymond Chen博客-如果事先已经调用了PostQuitMessage()
,MessageBox()将不会显示任何内容:
关于模态的另一个重要方面是WM\u退出
消息
总是打破模态循环
因此,如果在MessageBox()
之前调用PostQuitMessage()
,后者将收到WM\u QUIT
消息,取消其用户界面,重新发布WM\u QUIT
,然后退出。当您调用Destroy window
时(假设具有有效的窗口句柄)-当然所有子窗口都将被销毁。当然,所有子窗口都收到了WM\u DESTROY
ChildProc未接收到WM\u DESTROY
这是错误的。我绝对肯定它收到了
我做错了什么
调试诊断并从错误位置调用PostQuitMessage
您决定ChildProc“未接收”WM_DESTROY
,只是因为您未查看消息框。但如果您调用PostQuitMessage(0),它甚至会在显示之前关闭代码>