Different compilation behavior with GCC and MSVC

Question

I have subclassed some of the button controls, as I myself draw the entire user interface (in the hdc dialog box). This is done in order to avoid flickering, the goal is that all drawings are executed through a single memDC - preventing the user interface from being updated stepwise.

So, I draw everything against the background of the dialog, then place some buttons above the areas of the user interface that should respond to mouse events. So far, so good. Or so I thought.

I subclassed the buttons using the following WndProc, expecting Windows to do everything as usual except for the drawing.

LRESULT CALLBACK invisibleBtnProc(HWND hwndBtn, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
    long oldProc = GetWindowLong(hwndBtn, GWL_USERDATA);

    switch (uMsg)
    {
        case WM_PAINT:
            ValidateRect(hwndBtn, NULL);
            return 0;

        case WM_ERASEBKGND:
            return 1;
    }
    return CallWindowProc((WNDPROC)oldProc, hwndBtn, uMsg, wParam, lParam);
}

Buttons are created and subclassed by the following code:

for (i=0; i<n; i++)
{
    btn = CreateWindow(WC_BUTTON, L"", WS_VISIBLE|WS_CHILD, 0,0,0,0, hwndDlg, (HMENU)(firstBigBtnId+i), hInst, NULL);
    long btnProcCur = GetWindowLong(btn, GWL_WNDPROC);
    SetWindowLong(btn, GWL_USERDATA, btnProcCur);

    SetWindowLong(btn, GWL_WNDPROC, (long) invisibleBtnProc);
}

MinGW Code:: Blocks, . ( , )

, MSVC VS2010 . , - . , , 'button'.

WMF (emf? ), - , , , , -.

:

, , , - , . . - ( , InvalidateRect ) . .

, ?

EDIT: SCCCE ( GCC, )

#include <windows.h>

/*  Declare Windows procedure  */
LRESULT CALLBACK WindowProcedure (HWND, UINT, WPARAM, LPARAM);

RECT btnRect;
const int btnSize = 150;
const int btnId = 1000;
HINSTANCE hInst;


/*  Make the class name into a global variable  */
char szClassName[ ] = "CodeBlocksWindowsApp";

int WINAPI WinMain (HINSTANCE hThisInstance,
                     HINSTANCE hPrevInstance,
                     LPSTR lpszArgument,
                     int nCmdShow)
{
    HWND hwnd;               /* This is the handle for our window */
    MSG messages;            /* Here messages to the application are saved */
    WNDCLASSEX wincl;        /* Data structure for the windowclass */

    /* The Window structure */
    wincl.hInstance = hThisInstance;
    wincl.lpszClassName = szClassName;
    wincl.lpfnWndProc = WindowProcedure;      /* This function is called by windows */
    wincl.style = CS_DBLCLKS;                 /* Catch double-clicks */
    wincl.cbSize = sizeof (WNDCLASSEX);

    /* Use default icon and mouse-pointer */
    wincl.hIcon = LoadIcon (NULL, IDI_APPLICATION);
    wincl.hIconSm = LoadIcon (NULL, IDI_APPLICATION);
    wincl.hCursor = LoadCursor (NULL, IDC_ARROW);
    wincl.lpszMenuName = NULL;                 /* No menu */
    wincl.cbClsExtra = 0;                      /* No extra bytes after the window class */
    wincl.cbWndExtra = 0;                      /* structure or the window instance */
    /* Use Windows default colour as the background of the window */
    wincl.hbrBackground = (HBRUSH) COLOR_BACKGROUND;

    /* Register the window class, and if it fails quit the program */
    if (!RegisterClassEx (&wincl))
        return 0;

    /* The class is registered, let create the program*/
    hwnd = CreateWindowEx (
           0,                   /* Extended possibilites for variation */
           szClassName,         /* Classname */
           "Code::Blocks Template Windows App",       /* Title Text */
           WS_OVERLAPPEDWINDOW, /* default window */
           CW_USEDEFAULT,       /* Windows decides the position */
           CW_USEDEFAULT,       /* where the window ends up on the screen */
           544,                 /* The programs width */
           375,                 /* and height in pixels */
           HWND_DESKTOP,        /* The window is a child-window to desktop */
           NULL,                /* No menu */
           hThisInstance,       /* Program Instance handler */
           NULL                 /* No Window Creation data */
           );

    /* Make the window visible on the screen */
    ShowWindow (hwnd, nCmdShow);

    /* Run the message loop. It will run until GetMessage() returns 0 */
    while (GetMessage (&messages, NULL, 0, 0))
    {
        /* Translate virtual-key messages into character messages */
        TranslateMessage(&messages);
        /* Send message to WindowProcedure */
        DispatchMessage(&messages);
    }

    /* The program return-value is 0 - The value that PostQuitMessage() gave */
    return messages.wParam;
}


LRESULT CALLBACK invisibleBtnProc(HWND hwndBtn, UINT uMsg, WPARAM wParam, LPARAM lParam)
{
    long oldProc = GetWindowLong(hwndBtn, GWL_USERDATA);

    switch (uMsg)
    {
        case WM_PAINT:
            ValidateRect(hwndBtn, NULL);
            return 0;

        case WM_ERASEBKGND:
            return 1;
    }
    return CallWindowProc((WNDPROC)oldProc, hwndBtn, uMsg, wParam, lParam);
}

void onSize(HWND hwnd, WPARAM wParam, LPARAM lParam)
{
    RECT mRect;
    GetClientRect(hwnd, &mRect);
    btnRect.left = (mRect.right - btnSize) / 2;
    btnRect.top = (mRect.bottom - btnSize) / 2;
    btnRect.right = btnRect.left + btnSize;
    btnRect.bottom = btnRect.top + btnSize;

    HWND btn;
    btn = GetDlgItem(hwnd, btnId);
    MoveWindow(btn, btnRect.left, btnRect.top, btnSize, btnSize, false);

    InvalidateRect(hwnd, NULL, false);
}

void onPaint(HWND hwnd, WPARAM wParam, LPARAM lParam)
{
    HDC hdc;
    PAINTSTRUCT ps;
    HBRUSH bkBrush, redBrush;
    RECT mRect;

    GetClientRect(hwnd, &mRect);

    hdc = BeginPaint(hwnd, &ps);

        bkBrush = CreateSolidBrush(RGB(51,51,51) );
        redBrush = CreateSolidBrush(RGB(255,0,0) );
        FillRect(hdc, &mRect, bkBrush);
        FillRect(hdc, &btnRect, redBrush);
        DeleteObject(bkBrush);
        DeleteObject(redBrush);

    EndPaint(hwnd, &ps);
}

/*  This function is called by the Windows function DispatchMessage()  */
LRESULT CALLBACK WindowProcedure (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    switch (message)                  /* handle the messages */
    {
    case WM_CREATE:
            HWND tmp;
            tmp = CreateWindow("Button", "Press Me", WS_VISIBLE|WS_CHILD, 0,0,0,0, hwnd, (HMENU)btnId, hInst, NULL);
            long oldProc;
            oldProc = GetWindowLong(tmp, GWL_WNDPROC);
            SetWindowLong(tmp, GWL_USERDATA, oldProc);
            SetWindowLong(tmp, GWL_WNDPROC, (long)invisibleBtnProc);
            return 0;

        case WM_DESTROY:
            PostQuitMessage (0);       /* send a WM_QUIT to the message queue */
            break;

        case WM_SIZE:
            onSize(hwnd, wParam, lParam);
            return 0;

        case WM_PAINT:
            onPaint(hwnd, wParam, lParam);
            return 0;

        case WM_COMMAND:
            switch (LOWORD(wParam))
            {
                case btnId:
                    MessageBeep(MB_ICONEXCLAMATION);
                    break;
            }
            return 0;

        default:                      /* for messages that we don't deal with */
            return DefWindowProc (hwnd, message, wParam, lParam);
    }

    return 0;
}

Answer 1

BS_OWNERDRAW Windows, , . .

. .

tmp = CreateWindow("Button", "Press Me", WS_VISIBLE|WS_CHILD|BS_OWNERDRAW, 0,0,0,0, hwnd, (HMENU)btnId, hInst, NULL);

invisibleBtnProc

case WM_DRAWITEM:
    ValidateRect(hwndBtn, NULL);
    return TRUE;