Question

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

LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, WPARAM);

int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR szCmdLine, int    iCmdShow)

{
static TCHAR szAppName[] = TEXT ("HelloWin");
HWND  hwnd;
MSG msg;
WNDCLASS wndclass;

wndclass.style =  CS_HREDRAW | CS_VREDRAW ;
wndclass.lpfnWndProc = WndProc ;
wndclass.cbClsExtra = 0 ;
wndclass.cbWndExtra= 0 ;
wndclass.hInstance = hInstance;
wndclass.hIcon = LoadIcon (NULL, IDI_APPLICATION);
wndclass.hCursor = LoadCursor (NULL,IDC_ARROW);
wndclass.hbrBackground = (HBRUSH) GetStockObject (WHITE_BRUSH);
wndclass.lpszMenuName = NULL;
wndclass.lpszClassName = szAppName;

if (!RegisterClass (&wndclass))
{
   MessageBox (NULL, TEXT ("This program requires Windows NT!"), szAppName, MB_ICONERROR);
}
hwnd = CreateWindow (szAppName,
                    TEXT ("The Hello Program"),
                    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)
{
HDC  hdc;
PAINTSTRUCT ps;
RECT  rect;

switch (message)
/*case WM_CREATE;
PlaySound (TEXT("hellowin.wav"), NULL, SND_FILENAME|SND_ASYNCE);
return 0; */
{case WM_PAINT:
hdc = BeginPaint (hwnd,&ps);
GetClientRect (hwnd, &rect);
DrawText (hdc, TEXT ("Hello, Win 98!"), -1, &rect, DT_SINGLELINE|DT_CENTER|DT_VCENTER);
EndPaint (hwnd, &ps);
return 0;

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

您好，我试图复制出Petzold的编程Windows。在大多数情况下，它进展顺利。但是当我尝试编译时，我得到了wndclass.lpfnWndProc的错误。我试着查看它是否可能是一个操作系统问题，但无济于事。顺便错误说了一些关于无效转换为LRESULT .....但我找不到任何解决方案，所以我想知道它是否是一个操作系统问题（长点或什么）或什么。如果有任何网站可能有助于更好地“现代化”这本书，我们将不胜感激。谢谢扎克

Answer 1

修好这两个拼写错误后：

LRESULT CALLBACK WndProc ( HWND, UINT, WPARAM, LPARAM );
LRESULT CALLBACK WndProc ( HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam )

我发现代码编译并运行得很好：

C:\TEMP>cl test.c user32.lib gdi32.lib
Microsoft (R) 32-bit C/C++ Optimizing Compiler Version 15.00.30729.01 for 80x86
Copyright (C) Microsoft Corporation.  All rights reserved.

test.c
Microsoft (R) Incremental Linker Version 9.00.30729.01
Copyright (C) Microsoft Corporation.  All rights reserved.

/out:test.exe
test.obj
user32.lib
gdi32.lib

C:\TEMP>test.exe

Petzold编程Windows中的代码（使窗口错误）

1 个答案: