[英]How can I create a window (HWND) without using CreateWindow(Ex)?
[英]using CreateWindow to create a MDI child window
这有效
mcs.szTitle = L"untitled";
mcs.szClass = childClassName;
mcs.hOwner = GetModuleHandle(NULL);
mcs.x = mcs.cx = CW_USEDEFAULT;
mcs.y = mcs.cy = CW_USEDEFAULT;
mcs.style = WS_HSCROLL;
hChild = (HWND)SendMessage(hMDIClient, WM_MDICREATE, 0, (LONG)&mcs);
但是我不能向它发送指向具有我要使用的WndProc的对象的指针(请参见此处将WndProc包装在类中),就像这样
hChild = CreateWindow(childClassName, L"", WS_VISIBLE, CW_USEDEFAULT, CW_USEDEFAULT, 400, 250, hMDIClient, NULL, GetModuleHandle(NULL), this);
但是,这样做会导致windo出错,不会出现zlose,没有最小化,没有最大化,我无法调整其大小,并且如果我创建另一个mdi子窗口,则前一个将变为可取消选择状态。
是否可以使用SendMessage或CreateWindow,传递this指针并仍然创建有效的MDI Child窗口?
我这样做解决了
hChild = CreateMDIWindow(childClassName, L"", WS_EX_WINDOWEDGE, 49, 50, 51, 52, hMDIClient, GetModuleHandle(NULL), (LPARAM)this);
然后在静态WndProc中
LRESULT CALLBACK CWindowHandler::MsgRouter(HWND hwnd, UINT message,
WPARAM wparam, LPARAM lparam)
{
CREATESTRUCT* wnd = 0;
MDICREATESTRUCT* mdiStruct = 0;
CMDIChildWindowBase* wndBase;
if(message == WM_NCCREATE)
{
wnd = (CREATESTRUCT*)(lparam);
mdiStruct = (MDICREATESTRUCT*)wnd->lpCreateParams;
wndBase = (CMDIChildWindowBase*)mdiStruct->lParam;
SetWindowLongPtr(hwnd, GWLP_USERDATA, reinterpret_cast<LONG_PTR>(wndBase));
// save window handle
wndBase->SetHWND(hwnd);
}
else
wndBase = reinterpret_cast<CMDIChildWindowBase *>(::GetWindowLong(hwnd, GWL_USERDATA));
// call the windows message handler
if(wndBase)
return wndBase->WndProcs(message, wparam, lparam);
return DefWindowProc(hwnd, message, wparam, lparam);
}
因此,在创建MDIChild时,WndProc中的lparam将是指向CREATESTRUCT的指针,CREATESTRUCT的lpCreateParams将是MIDICREATESTRUCT,其lParam将是指向对象的指针。
唷。
将MDICREATESTRUCT
传递给WM_MDICREATE
,可以在MDICREATESTRUCT.lParam
字段中提供对象指针:
mcs.szTitle = L"untitled";
mcs.szClass = childClassName;
mcs.hOwner = GetModuleHandle(NULL);
mcs.x = mcs.cx = CW_USEDEFAULT;
mcs.y = mcs.cy = CW_USEDEFAULT;
mcs.style = WS_HSCROLL;
mcs.lParam = (LPARAM) this; // <-- here
hChild = (HWND) SendMessage(hMDIClient, WM_MDICREATE, 0, (LPARAM)&mcs);
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