【Windows编程】第一个窗口程序

【Windows编程】第一个窗口程序

创建一个C++ Win32 空项目

引入头文件

#include <Windows.h>
#include <iostream>

自实现 WindowProc 函数

LRESULT CALLBACK WindowProc(
	_In_ HWND hwnd,
	_In_ UINT uMsg,
	_In_ WPARAM wParam,
	_In_ LPARAM lParam
) {
	return DefWindowProcW(hwnd, uMsg, wParam, lParam);
}

创建入口函数

int WINAPI WinMain (
	HINSTANCE hInstance,
	HINSTANCE hPreInstance,
	LPSTR lpCmdeLine,
	int nCmdShow
) {
	return 0;
}

1. 创建一个窗口类

	WNDCLASS myClass = {0};
	myClass.lpszClassName = L"myClass";
	myclass.lpfnWndProc = WindowProc;

2. 注册窗口类

	RegisterClass(&myClass);

3. 创建窗口

	HWND hwindow = CreateWindow(
		myClass.lpszClassName,
		L"myWindow",
		WS_OVERLAPPEDWINDOW,
		CW_USEDEFAULT,
		0,
		CW_USEDEFAULT,
		0,
		NULL,
		NULL,
		hInstance,
		0
	);

4. 显示窗口

	ShowWindow(hwindow, SW_SHOWNORMAL);

5. 获取消息

	MSG msg = {0};
	while (GetMessage(&msg, 0, 0, 0)) {
		DispatchMessage(&msg);
	}

6. 在窗口回调函数处理消息

	switch (uMsg) {
	case WM_CREATE:
		MessageBox(hwnd, L"窗口创建了", L"提示", MB_OK);
		break;
	case WM_CLOSE:
		MessageBox(hwnd, L"窗口关闭了", L"提示", MB_OK);
		break;
	}

7. 完善 WM_CLOSE 逻辑

	DestroyWindow(hwnd);
	PostQuitMessage(0);

最后一步：修改项目属性，进入属性 - 链接器 - 系统，子系统修改为"窗口"

完整代码

#include <Windows.h>
#include <iostream>

LRESULT CALLBACK WindowProc(
	_In_ HWND hwnd,
	_In_ UINT uMsg,
	_In_ WPARAM wParam,
	_In_ LPARAM lParam
) {
	switch (uMsg) {
	case WM_CREATE:
		MessageBox(hwnd, L"窗口创建了", L"提示", MB_OK);
		break;
	case WM_CLOSE:
		MessageBox(hwnd, L"窗口关闭了", L"提示", MB_OK);
		DestroyWindow(hwnd);
		PostQuitMessage(0);
		break;
	}
	return DefWindowProcW(hwnd, uMsg, wParam, lParam);
}

int WINAPI WinMain (
	HINSTANCE hInstance,
	HINSTANCE hPreInstance,
	LPSTR lpCmdeLine,
	int nCmdShow
) {
	WNDCLASS myClass = {0};
	myClass.lpszClassName = L"myClass";
	myClass.lpfnWndProc = WindowProc;
	RegisterClass(&myClass);
	HWND hwindow = CreateWindow(
		myClass.lpszClassName,
		L"myWindow",
		WS_OVERLAPPEDWINDOW,
		CW_USEDEFAULT,
		0,
		CW_USEDEFAULT,
		0,
		NULL,
		NULL,
		hInstance,
		0
	);
	ShowWindow(hwindow, SW_SHOWNORMAL);
	MSG msg = {0};
	while (GetMessage(&msg, 0, 0, 0)) {
		DispatchMessage(&msg);
	}
	return 0;
}