The second dialog is modal with the first.
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Question
DialogBox() in WndProc()?
I would like my dialog box to display another dialog when a message is received. What is the effect of the following code on the calling thread? Is it allowed? Will it kill the message handling of the thread managing the MyDlgClass dialog? Should I have bidirectional messages instead (and manage the first dialog with CreateDialog)?
void MyShowDialog()
{
.
.
DialogBox(hInstance, "MyDlgClass", NULL, MyDlgProc);
.
.
}
INT_PTR CALLBACK MyDlgProc(HWND hWnd, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
.
case WM_INITDIALOG:
DialogBox(hInstance, "MyOtherDlgClass", NULL, MyOtherDlgProc);
break;
.
.
}
Thanks.
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Answers
It's OK, you can do this. Internally Windows creates message loop for each modal dialog. When you call second modal dialog, Windows disables parent dialog, but it's message loop is active, so parent dialog can redraw itself. Child dialog runs with it's own message loop, when it is closed, parent is activated.
No, this is the same thread, but another message loop. When your program runs, MyDloProc function instance is loaded to the stack. If this instance is handling WM_INITDIALOG, another dialog is opened. This MyDlgProc instance remains on the stack waiting for child dialog to be closed. However, message loop continues to run, and this dialog handles other messages, for example, WM_PAINT. When dialog is redrawn, another instance of MyDlgProc is loaded onto the stack, handles WM_PAINT message and unloaded.
This looks tricky because we don'r see the whole picture, we see only our message handlers called from somewhere. Adding some TRACE messages allows to understand this better.
I understand; thank you very much! I awarded you the points. But there is still a small point I would like to have info on. Is there something special I must do if I "block" the handler for WM_INITDIALOG? As I see it, since the first dialog is not initialized (the handler did not return), the dialog will not be shown... Or is it simply irrelevent since the return value of WM_INITDIALOG only affects the keyboard focus, which will be disabled as long as the second modal dialog will be visible?
Thanks again.
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by: _Rob_Posted on 2003-08-04 at 06:28:47ID: 9069906
It looks like the second dialog is going to be modal with the first. Is that what you want? Or should the user be able to work with both dialogs at once?
/rob