问题描述

想用按钮叫出对话框，可是不知在哪里出了问题，我是刚入门，各位高人帮我看看，大谢了。

#include

#define ID_START 2

LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM);
BOOL CALLBACK StartMenuProc (HWND, UINT, WPARAM, LPARAM);

int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
PSTR szCmdLine, int iCmdShow)
{
static TCHAR szAppName[] = TEXT ("WBD");
MSG msg;
HWND hwnd;
WNDCLASS wndclass;

wndclass.style = CS_HREDRAW | CS_VREDRAW;
wndclass.lpfnWndProc = WndProc;
wndclass.cbClsExtra = 10;
wndclass.cbWndExtra = 20;
wndclass.hbrBackground = (HBRUSH)GetStockObject (WHITE_BRUSH);
wndclass.hInstance = hInstance;
wndclass.hIcon = LoadIcon (NULL, szAppName);
wndclass.hCursor = LoadCursor (NULL, IDC_ARROW);
wndclass.lpszMenuName = NULL;
wndclass.lpszClassName = szAppName;

if (!RegisterClass (&wndclass))
{
    MessageBox (NULL, TEXT ("Need NT"), szAppName, MB_ICONERROR);

    return 0;
}

hwnd = CreateWindow (szAppName, TEXT ("WBD"), WS_OVERLAPPEDWINDOW,
    CW_USEDEFAULT, CW_USEDEFAULT,
    CW_USEDEFAULT, CW_USEDEFAULT,
    NULL, NULL, hInstance, NULL);

ShowWindow (hwnd, iCmdShow);
UpdateWindow (hwnd);

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

}

return msg.wParam;

}

LRESULT CALLBACK WndProc (HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
static HINSTANCE hInstance;
static HWND hwndButton;
static RECT rect;
static int cxChar, cyChar;
HDC hdc;
PAINTSTRUCT ps;
static TCHAR szStart[] = TEXT ("Start");
switch (message)
{
case WM_CREATE:
hInstance = ((LPCREATESTRUCT)lParam)->hInstance;
cxChar = LOWORD (GetDialogBaseUnits ());
cyChar = HIWORD (GetDialogBaseUnits ());

    hwndButton = CreateWindow (TEXT ("button"), szStart,
        WS_CHILD | WS_VISIBLE | BS_PUSHBUTTON,
        30 * cxChar, 30 * cyChar,
        20 * cxChar, 7 * cyChar / 4,
        hwnd, (HMENU)ID_START,
        ((LPCREATESTRUCT)lParam)->hInstance, NULL);
    return 0;

case WM_SIZE:
    rect.left   = 24 * cxChar;
    rect.top    = 2 * cyChar;
    rect.right = LOWORD (lParam);
    rect.bottom = HIWORD (lParam);
    return 0;

case WM_PAINT:
    InvalidateRect (hwnd,&rect,TRUE);

    hdc = BeginPaint (hwnd, &ps);
    SelectObject (hdc, GetStockObject (SYSTEM_FIXED_FONT));
    SetBkMode (hdc, TRANSPARENT);

    EndPaint (hwnd, &ps);
    return 0;

case WM_DRAWITEM:

case WM_COMMAND:
    switch (LOWORD (wParam))
    {
    case ID_START:
        DialogBox (hInstance, TEXT ("StartMenu"), hwnd, StartMenuProc);
        break;
    }
        return 0;

case WM_DESTROY:
    PostQuitMessage (0);
    return 0;
}
return DefWindowProc (hwnd, message, wParam, lParam);

}
BOOL CALLBACK StartMenuProc (HWND hDlg, UINT message, WPARAM wParam, LPARAM lParam)
{
switch (message)
{
case WM_INITDIALOG :
return TRUE;

case WM_COMMAND:
    switch (LOWORD (wParam))
    {
    case IDOK:
    //case IDCANCEL:
        EndDialog (hDlg, 0);
        return TRUE;
    }
    break;
}
return FALSE;

}

解决方案

这一段代码有问题吧
另外，调试一下看看能否执行到 ID_START 分支？

 case WM_DRAWITEM:

case WM_COMMAND:
    switch (LOWORD (wParam))
    {
    case ID_START:
        DialogBox (hInstance, TEXT ("StartMenu"), hwnd, StartMenuProc);
        break;
    }
        return 0;

解决方案二：

事先你准备好了DialogBox需要的对话框资源了么？
建议你用VC++的win32程序向导创建一个程序，在此基础上修改。

解决方案三：

这段代码莫非是利物浦的教材？

解决方案四：

RS文件有吗？查一下。就是写一个资源文件，然后编译