Manual alternative to message map?
I am trying to create a GUI to display information read from a file. So I will need some number of pushbuttons, text fields, and radio buttons - but I won't know how many I need until run-time.
I am using Visual Studio 6.0. My toolset is fairly non-negotiable, so please refrain from suggesting Java, or any C++ toolkit that does not come pre-installed in Visual Studio. My problem is that most of the tutorials I have found online focus on using the WYSIWYG editor - which requires knowing what controls are needed up front.
I found a code sample that allows me to add controls manually (exerpts below):
class CalcApp : public CWinApp
{
...
};
class CWindow : public CFrameWnd
{
...
afx_msg void HandleButton2();
afx_msg HBRUSH OnCtlColor( CDC* pDC, CWnd* pWnd, UINT nCtlColor );
DECLARE_MESSAGE_MAP();
virtual BOOL PreTranslateMessage(MSG* msg);
};
.cpp file:
BEGIN_MESSAGE_MAP( CWindow, CFrameWnd )
ON_BN_CLICKED(IDC_BUTTON1, HandleButton1)
ON_BN_CLICKED(IDC_BUTTON2, HandleButton2)
END_MESSAGE_MAP()
CWindow::CWindow()
{
Create(NULL, "Title",
WS_OVERLAPPED | WS_MINIMIZEBOX | WS_SYSMENU,
CRect(CPoint(50,50),CSize(180,300)));
...
button2 = new CButton();
button2 -> Create("&Quit",
WS_CHILD|WS_VISIB开发者_运维技巧LE|WS_TABSTOP,
CRect(CPoint(2,202),CSize(152,38)),
this, IDC_BUTTON2);
}
void CWindow::HandleButton2()
{
DestroyWindow ();
}
BOOL CalcApp::InitInstance()
{
m_pMainWnd = new CWindow();
m_pMainWnd->ShowWindow(m_nCmdShow);
m_pMainWnd->UpdateWindow();
return TRUE;
}
What I'm having trouble figuring out is how to handle the message processing without using the BEGIN_MESSAGE_MAP(), etc macros - which, again, require knowing how many handlers you need up front.
The only solution I've been able to find looks like this:
LRESULT CALLBACK WndProc(HWND hWnd, UINT Msg, WPARAM wParam, LPARAM lParam);
INT WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,
LPSTR lpCmdLine, int nCmdShow)
{
...
WndClsEx.lpfnWndProc = WndProc;
RegisterClassEx(&WndClsEx);
hWnd = CreateWindowEx(WS_EX_OVERLAPPEDWINDOW,
ClsName,
WindowCaption,
WS_OVERLAPPEDWINDOW,
100,
120,
640,
480,
NULL,
NULL,
hInstance,
NULL);
ShowWindow(hWnd, nCmdShow);
UpdateWindow(hWnd);
while( GetMessage(&Msg, NULL, 0, 0) )
{
TranslateMessage(&Msg);
DispatchMessage(&Msg);
}
return Msg.wParam;
}
//---------------------------------------------------------------------------
LRESULT CALLBACK WndProc(HWND hWnd, UINT Msg, WPARAM wParam, LPARAM lParam)
{
switch(Msg)
{
case WM_DESTROY:
PostQuitMessage(WM_QUIT);
break;
default:
return DefWindowProc(hWnd, Msg, wParam, lParam);
}
return 0;
}
Which is great, except.. I don't have a WinMain...
My understanding is that you can either do a "Win32" application (the WinMain code above) or an "MFC" application (the CButton code above). But I can only find examples of manually adding controls for MFC, and I can only find examples of manually processing messages for Win32.
Can you point me to one of the things I'm missing here? Ideally, I want a solution for handling my own messages with MFC, but I'd settle for a good tutorial on creating controls with Win32...
Once upon a time I did something like this. I allocated a rage of control ids (not used in resource.h). Added controls with these ids dynamically to the page.
To handle the event I took over the OnCommand on the Windows and listened for controls with ids in the range I was looking for.
(I need to search old code to be more specific)
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