Question

我是新手学习使用c ++创建WIN32程序，但是，当我按照书中的说明尝试创建我的第一个程序时，我遇到了以下问题

#include <windows.h>

const char g_szClassName[] = "myWindowClass";

//Step 4: the Window Procedure
LRESULT CALLBACK WndProc (HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
switch(msg)
{
    case WM_CLOSE:DestroyWindow(hwnd); break;
    case WM_DESTROY:PostQuitMessage(0); break;
    deafult:
        return DefWindowProc(hwnd, msg, wParam, lParam);
}
return 0;
}

int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow)
{
WNDCLASSEX wc;
HWND hwnd;
MSG Msg;

//Step 1: Registering the Window Class
wc.cbSize       =sizeof(WNDCLASSEX);
wc.style        =0;
wc.lpfnWndProc  =WndProc;
wc.cbClsExtra   =0;
wc.cbWndExtra   =0;
wc.hInstance    =hInstance;
wc.hIcon        =LoadIcon(NULL, IDI_APPLICATION);
wc.hCursor      =LoadCursor(NULL, IDC_ARROW);
wc.hbrBackground=(HBRUSH)(COLOR_WINDOW+1);
wc.lpszMenuName =NULL;
wc.lpszClassName=g_szClassName;
wc.hIconSm      =LoadIcon(NULL, IDI_APPLICATION);

if(!RegisterClassEx(&wc))
{
    MessageBox(NULL, "Window Registration Failed!", "Error!", MB_ICONEXCLAMATION | MB_OK);
    return 0;
}

//Step 2: Creating the Window
hwnd = CreateWindowEx(WS_EX_CLIENTEDGE, g_szClassName, "The title of my window", WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT, 240, 120, NULL, NULL, hInstance, NULL);
if(hwnd == NULL)
{
    MessageBox(NULL, "Window Creation Failed!", "Error!", MB_ICONEXCLAMATION | MB_OK);
    return 0;
}

ShowWindow(hwnd, nCmdShow);
UpdateWindow(hwnd);

//Step 3: The Message Loop
while(GetMessage(&Msg, NULL, 0, 0) > 0)
{
    TranslateMessage(&Msg);
    DispatchMessage(&Msg);
}
return Msg.wParam;
}

但它一直在返回“窗口创建失败！”，我不知道它有什么问题，我做了很多校对。请帮帮我！

Answer 1

case WM_CLOSE:DestroyWindow(hwnd); break;
case WM_DESTROY:PostQuitMessage(0); break;
deafult:
    return DefWindowProc(hwnd, msg, wParam, lParam);

可能很难看到它，并且因为它是一个正常的标签而编译它是残忍的（尽管我收到来自-Wunused-label的警告），但你拼错了default。这会导致WM_NCCREATE无法处理，从而导致窗口创建失败。

值得注意的是，您处理WM_CLOSE的方式与DefWindowProc相同，只需调用DestroyWindow即可。你可以忽略这种情况，但最终还是会在窗口关闭时发生同样的事情。

需要有关基本Windows C的帮助

1 个答案: