[C++] treeview eigen windowprocedure werkt niet

[Overspeed]

Op de één of andere manier krijg ik het niet voor elkaar om de window procedure van de treeview te laten werken...

De MessageBoxen in de switch van TreeViewWindowProc worden niet uitgevoerd.

De code:

code:

#include <windows.h>
#include <commctrl.h>

static TCHAR szAppName[] = TEXT("blaat");
static TCHAR szClassName[] = TEXT("MyWindowClass");
static TCHAR szTreeViewClass[] = TEXT("MyTreeViewClass");

HWND hTreeview;
HINSTANCE hInstance;

LRESULT CALLBACK MyWndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    switch (message)
    {
    case WM_CREATE:
        break;
    case WM_SIZE:
        MoveWindow(hTreeview, 0, 30, 200, HIWORD(lParam), false);
        break;
    case WM_DESTROY:
        PostQuitMessage(0);
        break;
    default:
        return DefWindowProc(hWnd, message, wParam, lParam);
    }
    return 0;
}

LRESULT CALLBACK TreeViewWindowProc(HWND hTreeview, UINT message, WPARAM wParam, LPARAM lParam)
{
    switch (message)
    {
    case WM_CREATE:
        MessageBox(hTreeview, TEXT("WM_CREATE"), TEXT("Melding"), MB_OK);
        break;
    case WM_SIZE:
        MessageBox(hTreeview, TEXT("WM_SIZE"), TEXT("Melding"), MB_OK);
        break;
    default:
        return DefWindowProc(hTreeview, message, wParam, lParam);
    }
    return 0;
}

void RegisterTreeViewClass(HINSTANCE hInstance, LPCTSTR Name)
{
    WNDCLASSEX wcWindow;

    wcWindow.cbSize = sizeof(wcWindow);
    wcWindow.lpfnWndProc = (WNDPROC) TreeViewWindowProc;
    wcWindow.style = CS_HREDRAW|CS_VREDRAW;
    wcWindow.cbClsExtra = 0;
    wcWindow.cbWndExtra = 0;
    wcWindow.hInstance = hInstance;
    wcWindow.hIcon = NULL;
    wcWindow.hIconSm = NULL;
    wcWindow.hCursor = LoadCursor(NULL, IDC_ARROW);
    wcWindow.hbrBackground = (HBRUSH) COLOR_HIGHLIGHT;
    wcWindow.lpszMenuName = NULL;
    wcWindow.lpszClassName = Name;

    RegisterClassEx(&wcWindow);
}

void MyRegisterClass(HINSTANCE hInstance, LPCTSTR Name)
{
    WNDCLASSEX wc;

    wc.cbSize = sizeof(wc);
    wc.lpfnWndProc = (WNDPROC) MyWndProc;
    wc.style = CS_HREDRAW|CS_VREDRAW;
    wc.cbClsExtra = 0;
    wc.cbWndExtra = 0;
    wc.hInstance = hInstance;
    wc.hIcon = NULL;
    wc.hIconSm = NULL;
    wc.hCursor = LoadCursor(NULL, IDC_ARROW);
    wc.hbrBackground = (HBRUSH) COLOR_WINDOW;
    wc.lpszMenuName = NULL;
    wc.lpszClassName = Name;

    RegisterClassEx(&wc);

}


HWND CreateTreeview(HWND hWnd, HINSTANCE hInstance)
{
    hTreeview = CreateWindow(WC_TREEVIEW, "",
    WS_VISIBLE|WS_CHILD|WS_BORDER|TVS_LINESATROOT|TVS_HASLINES|TVS_HASBUTTONS, 0, 30, 270, 500,
    hWnd, NULL, hInstance, NULL);

    return hTreeview;
}


HWND MyInitWindow(HINSTANCE hInstance, int nShowCmd)
{
    HWND hWnd;

    hWnd = CreateWindow(szClassName,
                        szAppName,
                        WS_OVERLAPPEDWINDOW,
                        CW_USEDEFAULT,
                        0,
                        CW_USEDEFAULT,
                        0,
                        NULL,
                        NULL,
                        hInstance,
                        NULL);
    if (hWnd)
    {
        ShowWindow(hWnd, nShowCmd);
        UpdateWindow(hWnd);
    }

    return hWnd;
}

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nShowCmd)
{
    HWND hWnd;
    MSG msg;
    INITCOMMONCONTROLSEX ictrl;

    ictrl.dwICC = ICC_TREEVIEW_CLASSES;
    ictrl.dwSize = sizeof(ictrl);
    InitCommonControlsEx(&ictrl);

    MyRegisterClass(hInstance, szClassName);
    hWnd = MyInitWindow(hInstance, nShowCmd);

    
    RegisterTreeViewClass(hInstance, szTreeViewClass);
    hTreeview = CreateTreeview(hWnd, hInstance);

    while (GetMessage(&msg, NULL, 0, 0))
    {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }

    return msg.wParam;
}

[.oisyn]

simpel: je WM_CREATE retourneert NULL, waardoor het maken van de treeview gecanceled wordt

vang WM_CREATE niet af (dus gooi m door naar DefWindowProc), of retourneer TRUE