[RESOLVED] how can i call LRESULT CALLBACK WindowProc() function?

[Cambalinho]

in these case, i'm using a console aplication, so i don't have the windows class. then how can i call the LRESULT CALLBACK WindowProc() function?

[VictorN]

What for?

[Cambalinho]

What for?

is 1 thing that i need
i have these code:

#include <iostream>
#include <windows.h>
#include <conio.h>

using namespace std;

LRESULT CALLBACK conProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
    switch(msg)
    {
        case WM_DESTROY:
            MessageBox(NULL, "The window was destroyed", "bye", MB_OK);
            break;
        case WM_CREATE:
            MessageBox(NULL, "The window was created", "hello", MB_OK);
    }
    return DefWindowProc(hWnd, msg, wParam, lParam );
}

int main()
{
    SetWindowLong(GetConsoleWindow(), GWL_WNDPROC, (LONG)conProc);
    std::cout << GetLastError();
    getch();
    return 0;
}

but i get 1 error "Error code: 5 - Access is denied" on GetLastError()
can you advice me?

[Paul McKenzie]

is 1 thing that i need
i have these code:

Why are you not checking the return value of GetConsoleWindow()?

Why are you not checking the SetWindowLong() return code? You are not supposed to call GetLastError() if the function is successful.

Please read the documentation about the return code:
http://msdn.microsoft.com/en-us/libr...(v=vs.85).aspx

Regards,

Paul McKenzie

[Cambalinho]

Why are you not checking the return value of GetConsoleWindow()?

Why are you not checking the SetWindowLong() return code? You are not supposed to call GetLastError() if the function is successful.

Please read the documentation about the return code:
http://msdn.microsoft.com/en-us/libr...(v=vs.85).aspx

Regards,

Paul McKenzie

the give me a value diferent than NULL: 0x1f082e
and the SetWindowLong() give 0(zero). meaning that something isn't correct

[Paul McKenzie]

the give me a value diferent than NULL: 0x1f082e
and the SetWindowLong() give 0(zero). meaning that something isn't correct

Did you read the documentation carefully?

If the previous value of the specified 32-bit integer is zero, and the function succeeds, the return value is zero, but the function does not clear the last error information. This makes it difficult to determine success or failure.

To deal with this, you should clear the last error information by calling SetLastError with 0 before calling SetWindowLong. Then, function failure will be indicated by a return value of zero and a GetLastError result that is nonzero

You should post your current code, the code that checks for errors and return codes in the correct way. Your first code you posted is not correct.

Regards,

Paul McKenzie

[VictorN]

What "messages" would you like to get for your console window?

[Cambalinho]

What "messages" would you like to get for your console window?

mouse, keyboard, paint, move, what is possible
whats why i wanted use that function for i get more easy the messages

[VictorN]

mouse, keyboard, paint, move, what is possible

Well, I never worked with console windows... Therefore I ask you: are you sure these messages come to console?
Did you check it (with Spy++ or some other tool?)

[Cambalinho]

Well, I never worked with console windows... Therefore I ask you: are you sure these messages come to console?
Did you check it (with Spy++ or some other tool?)

i don't know use the Spy++ but i have it

[Paul McKenzie]

mouse, keyboard, paint, move, what is possible
whats why i wanted use that function for i get more easy the messages

But as I stated, you must take those messages you intercepted and give them to the original console window procedure when you are done with them. You can't just throw the messages away as your code is doing now.

Regards,

Paul McKenzie

[Cambalinho]

But as I stated, you must take those messages you intercepted and give them to the original console window procedure when you are done with them. You can't just throw the messages away as your code is doing now.

Regards,

Paul McKenzie

#include <iostream>
#include <windows.h>
#include <conio.h>
#include <string>
using namespace std;

LRESULT CALLBACK ConsoleWndProc(HWND hWnd, UINT msg, WPARAM wParam, LPARAM lParam)
{    
    switch(msg)
    {
        case WM_DESTROY:
            MessageBox(NULL, "The window was destroyed", "bye", MB_OK);
            break;
        case WM_CREATE:
            MessageBox(NULL, "The window was created", "hello", MB_OK);
    }
    return CallWindowProc((WNDPROC ) ConsoleWndProc, hWnd, msg, wParam, lParam);
}

int main()
{
    string a;
    cout << GetConsoleWindow() << endl;//the value is diferent from 0(zero)\NULL
    SetLastError(0);
    cout << SetWindowLong(GetConsoleWindow(), GWL_WNDPROC, (LONG)ConsoleWndProc);//here i recive 0(zero)
    cout << GetLastError();
    cin >> a;
    return 0;
}

but how can i do it, if the SetWindowLong() function is give problems?
i have sure about the GetConsoleWindow(), because i get the HDC from it and works fine. i have used the HDC

[VictorN]

Then learn how to use it and do use!

[2kaud]

but i get 1 error "Error code: 5 - Access is denied" on GetLastError()
can you advice me?

Yes - you can't do this with consoles! Windows won't let you subclass a console window.

What exactly are you trying to achieve?

[Cambalinho]

Yes - you can't do this with consoles! Windows won't let you subclass a console window.

What exactly are you trying to achieve?

just get the messages for add events in my class
i'm trying another code but i don't know how works

MSG msg;
    BOOL bRet;
    //...
    while( (bRet = GetMessage( &msg, NULL, 0, 0 )) != 0)
    { 
        if (bRet == -1)
        {
            // handle the error and possibly exit
        }
        else
        {
            TranslateMessage(&msg); 
            DispatchMessage(&msg); 
        }
    }

i belive these is the other way, but isn't working
can you advice?
i only need get the messages from console