C++ windows.h - window 打不开

Question

#include<windows.h>
#include<iostream>
#include<tchar.h>

LRESULT CALLBACK WindowProcedure(HWND, UINT, WPARAM, LPARAM);

TCHAR szClassName[ ] = _T("ClassName");

int WINAPI WinMain(HINSTANCE hThisInstance, HINSTANCE hPrevInstance, LPSTR lpszArgument, int nCmdShow)
{
    HWND hwnd;
    MSG messages;
    WNDCLASSEX wincl;
    wincl.hInstance = hThisInstance;
    wincl.lpszMenuName = szClassName;
    wincl.lpfnWndProc = WindowProcedure;
    wincl.style = CS_DBLCLKS;
    wincl.cbSize = sizeof(WNDCLASSEX);
    wincl.hIcon = LoadIcon(NULL, IDI_APPLICATION);
    wincl.hIconSm = LoadIcon(NULL, IDI_APPLICATION);
    wincl.hCursor = LoadCursor(NULL, IDC_ARROW);
    wincl.cbClsExtra = 0;
    wincl.cbWndExtra = 0;
    wincl.hbrBackground = (HBRUSH) COLOR_BACKGROUND;
    if (!RegisterClassEx(&wincl))
        return 0;
    hwnd = CreateWindowEx(0, szClassName, _T("ClassName"), WS_OVERLAPPEDWINDOW, CW_USEDEFAULT, CW_USEDEFAULT, 544, 375, HWND_DESKTOP, NULL, hThisInstance, NULL);
    ShowWindow(hwnd, nCmdShow);
    while(GetMessage(&messages, NULL, 0, 0))
    {
        TranslateMessage(&messages);
        DispatchMessage(&messages);
    }
    return messages.wParam;
}

LRESULT CALLBACK WindowProcedure(HWND hwnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    switch(message)
    {
        case WM_DESTROY:
            PostQuitMessage(0);
            break;
        default:
            return DefWindowProc(hwnd, message, wParam, lParam);
    }
    return 0;
}

window 不显示 up/open。我已经连续尝试了 6 个小时才找到问题所在，它并没有在控制台中给我一个错误，它只是创建了 .exe window 而不是另一个 window。我是新手，所以不知道该怎么做或如何回复。

Answer 1

这种说法是错误的：

wincl.lpszMenuName = szClassName;

需要改为：

wincl.lpszClassName = szClassName;

您没有检查 CreateWindowEx() 是否失败 (returns NULL):

hwnd = CreateWindowEx(...);
if (hWnd == NULL) ... // <-- ADD THIS

在这种情况下，确实会失败，因为你没有正确注册class名称，所以创建window会报ERROR_CANNOT_FIND_WND_CLASS （1407）错误来自GetLastError().

C++ windows.h - window 打不开

C++ windows.h - window doesnt open

c++

windows

winapi