我有这个代码,这是我正在创建的用户界面系统的一部分,它将具有多个Windows
bool UISystem::HandleMessage(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
UIWindow* target = NULL;
for(vector<UIWindow*>::iterator it = windowList.begin(); it < windowList.end(); it++)
{
if((*it)->windowHandle == hwnd)
{
target = *it;
break;
}
}
if(target == NULL)
{ return false; }
switch(msg)
{
case WM_DESTROY:
return true;
case WM_PAINT:
return true;
default:
return false;
}
}
LRESULT WINAPI UISystem::WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
/*if(UISYSTEM->HandleMessage(hwnd, msg, wParam, lParam))
{
}*/
return DefWindowProc(hwnd, msg, wParam, lParam);
}
当该代码按原样实现(包括uisystem :: wndproc中的注释块)时,正确显示了一个窗口,但是,如果我在uisystem中删除此块:: wndproc中的此块,那么从createwindow返回了一个无效的句柄值得赞赏,因为这确实使我感到困惑,我试图在uisystem中执行其他任何代码:: wndproc中的任何其他代码之前,都试图致电defwindowproc,但是我所有的adtemps都失败了
这是uiwindow的构造函数:
UIWindow::UIWindow(int x, int y, int width, int height, string & text)
{
int frameWidth = GetSystemMetrics(SM_CXSIZEFRAME);
int frameHeight = GetSystemMetrics(SM_CYSIZEFRAME);
int menuHeight = GetSystemMetrics(SM_CYMENU);
int windowXPos = (GetSystemMetrics(SM_CXSCREEN) - width) / 2;
int windowYPos = (GetSystemMetrics(SM_CYSCREEN) - height) / 2;
int windowWidth = width + frameWidth * 2;
int windowHeight = height + frameHeight * 2 + menuHeight;
bounds.X = x;
bounds.Y = y;
bounds.Width = width;
bounds.Height = height;
title = text;
MSG msg;
WNDCLASSEX wc = {sizeof(WNDCLASSEX), CS_VREDRAW|CS_HREDRAW|CS_OWNDC,
&UISystem::WndProc, 0, 0, hInstance, NULL, NULL, (HBRUSH)(COLOR_WINDOW + 1),
NULL, "AurousWindow", NULL};
RegisterClassEx(&wc);
windowHandle = CreateWindow("AurousWindow", title.c_str(), WS_OVERLAPPEDWINDOW, windowXPos, windowYPos, windowWidth, windowHeight, NULL, NULL, hInstance, NULL);
SetWindowRgn(windowHandle, CreateRectRgn(0, 0, width, height), TRUE);
ShowWindow(windowHandle, nShow);
UpdateWindow(windowHandle);
//RECT rec = {0, 0, width, height};
while(GetMessage(&msg, NULL, 0, 0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
}
不确定这是否是根问题,但是您应该解决的一件事是删除:
while(GetMessage(&msg, NULL, 0, 0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
来自:
UIWindow::UIWindow(int x, int y, int width, int height, string & text)
,只要您的窗户存在,并且将阻止Uiwindow的正确构造。实际上,此对象(UIWindow)正在内部访问:UISYSTEM :: handlemessage,但是由于其构造函数永远不会结束,因此它可能是无效的或处于未定义的状态。