这是我的代码,在 WinMain 入口点我注册了一个类并尝试创建一个窗口,但 CreateWindow() 函数总是返回 NULL。但是 RegisterClass() 函数确实成功了。我做错了什么?
#include <Windows.h>
#include <stdio.h>
LRESULT CALLBACK event(HWND, UINT, WPARAM, LPARAM)
{
return 0;
}
int CALLBACK WinMain(
_In_ HINSTANCE hInstance,
_In_ HINSTANCE hPrevInstance,
_In_ LPSTR lpCmdLine,
_In_ int nCmdShow
)
{
WNDCLASS wndClass;
wndClass.hbrBackground = (HBRUSH)GetStockObject(WHITE_BRUSH);
wndClass.hCursor = LoadCursor(NULL, IDC_ARROW);
wndClass.hIcon = LoadIcon(NULL, IDI_APPLICATION);
wndClass.hInstance = hInstance;
wndClass.lpszMenuName = NULL;
wndClass.lpfnWndProc = event;
wndClass.lpszClassName = L"ME";
wndClass.cbClsExtra = 0;
wndClass.cbWndExtra = 0;
wndClass.style = CS_HREDRAW | CS_VREDRAW;
int err = RegisterClass(&wndClass);
if (err < 0)
{
MessageBox(NULL, L"Can not register window class!", L"Error", 0);
return -1;
}
HWND hwnd;
hwnd = CreateWindow(L"ME",
L"Test",
WS_OVERLAPPEDWINDOW,
100,
100,
300,
300,
NULL,
NULL,
hInstance,
NULL);
if (hwnd == NULL)
{
MessageBox(NULL, L"Can not create window!", L"Error", 0);
return -1;
}
ShowWindow(hwnd, SW_NORMAL);
UpdateWindow(hwnd);
MSG msg;
while (GetMessage(&msg, NULL, 0, 0))
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return 0;
}