Finding DialogBox handle...

jyc · #1 04-May-2009, 13:59

Hello there,

I'm new here ! Hello! I'm a student currenlty working on a project (Very rushed) in C++ (i only had JAVA and command-line C programming experience..) Excuse me if the following question sounds trivial, I really need URGENT HELP! Many thanks in advance.

The only window created in my program uses DialogBoxIndirectParam. Is there anyway I can point the WSAAsyncSelect method to send messages to the DialogBox? Following are snippets of the code:

CPP / C++ / C Code:

	DialogBoxIndirectParam (GetModuleHandle (0), &t, 0, (DLGPROC)EditorProc, (LPARAM)effect);
	WSAAsyncSelect (ListenSocket, FindWindow(NULL, "Editor") , 1000, (FD_ACCEPT | FD_CONNECT | FD_READ | FD_CLOSE));

And the CALLBACK method:

CPP / C++ / C Code:

INT_PTR CALLBACK EditorProc (HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)

Basically, I want EditorProc to handle both the dialog loop and the Sockets..is it possible?

Many thanks!

Jyc.

Mexican Bob · #2 04-May-2009, 19:36

This is easier than it sounds. In your WM_INITDIALOG, you simply use the dwInitParam (that you're not currently using) to pass the "hwndDlg" member of the DialogProc...

CPP / C++ / C Code:

INT_PTR CALLBACK DialogProc(          HWND hwndDlg,
    UINT uMsg,
    WPARAM wParam,
    LPARAM lParam
);

Here's the general idea. Create a static variable:

CPP / C++ / C Code:

static DWORD* hDlg = NULL;

...in your DialogBoxIndirectParam call you PASS THE PARAM (note the "Param" part of the function name?) to it.

CPP / C++ / C Code:


...(LPARAM)hDlg);

...in your WM_INITDIALOG message you:

CPP / C++ / C Code:


....case WM_INITDIALOG:
         hDlg = (DWORD)hwndDlg;
         ...
         break;

--OR--

CPP / C++ / C Code:

....case WM_INITDIALOG:
         (*(DWORD*)(lParam)) = (DWORD)hwndDlg;
         ...
         break;

And, then, when you need to use it, you cast it to the appropriate type and use it.

CPP / C++ / C Code:

HWND hwnd = (HWND)hDlg;
GetDialogItem(hDlg, ...);

...or something like that. "Qualifier" I wrote this from my MacBook without a Windows box around.

Consider this stupid simple example as an example of using casting for the types that you will likely see as opaque pointers in Win32 code.

CPP / C++ / C Code:

#include <windows.h>
#include <stdio.h>

static DWORD* hDlg = NULL;

void bogus()
{
    printf("bogus\n");
}

int main()
{
    hDlg = (DWORD*)&bogus;
    ((void (*)(void))hDlg)();
    return 0;
}

MxB

jyc · #3 05-May-2009, 05:21

many thanks!

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Finding DialogBox handle...

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Re: Finding DialogBox handle...