How to handle message send from view class to dialog? - mfc

Question

I have SDI application that hand view, doc and mainframe. In view class, I have button to open another dialog, let say Chartering dialog. I would like to open that dialog and send initial value from view to assign some variable at dialog, but I can not catch message event at dialog class. Below as my code:
// button onclick to show new dialog
charteringDlg = new CharteringDlg();
// show chartering dialog
if(charteringDlg->Create(IDD_DIALOG_CHATTERING, GetDesktopWindow()))
{
bChartering = true;
charteringDlg->MoveWindow(900,300,450,300);
charteringDlg->ShowWindow(SW_SHOW);
int temp = 12;
GetMain()->SendMessage(UWM_MYMESSAGE_CHARTERING, 0,(LPARAM)&temp);
}
and in chartering dialog I handle message like below
ON_MESSAGE(UWM_MYMESSAGE_CHARTERING, &CharteringDlg::OnSetShowTemp)
chartering function
LRESULT CharteringDlg::OnSetShowTemp(WPARAM, LPARAM lParam)
{
int * s = (int *)lParam;
return 0;
}
I set break point at OnSetShowTemp() function but it cannot jump there.
Any idea would be great appreciated.

Answer 1

For assigning an initial value to one of your dialog's members you don't need to send it a message.
You can just assign the value directly:
So instead of
GetMain()->SendMessage(UWM_MYMESSAGE_CHARTERING, 0,(LPARAM)&temp);
you should have something like:
charteringDlg->thevalueorwhatever = 12;
And BTW:
GetMain()->SendMessage(UWM_MYMESSAGE_CHARTERING, 0,(LPARAM)&temp);
is wrong anyway, you should send the message to the dialog and not to the main window:
charteringDlg->SendMessage(UWM_MYMESSAGE_CHARTERING, 0,(LPARAM)&temp);