2.16 win32信息 事件 机制-创建第一个win32程序

事件和信息

事件，例如鼠标的单机 会保存很多数据 这个便是信息

Windows为了能够准确的描述这些信息，提供了一个结构体：MSG，该结构体里面记录的事件的详细信息.

typedef struct tagMSG {
  HWND   hwnd; 		//窗口句柄
  UINT   message; 		///信息类别 下面信息类型
  WPARAM wParam;
  LPARAM lParam;
  DWORD  time; 		//信息创建时间
  、
  POINT  pt; 		//创建时 鼠标的位置
} MSG, *PMSG;

信息与事件的对应关系

流程

鼠标按下--事件

创建信息-包含鼠标位置 还有类别（左单机 右单机）

将信息放入队列中 队列获取信息 对信息进行处理

将dis加工的信息传递给操作系统

系统调用窗口过程函数

第一个win32 代码编写

点击查看代码

// WindowsProject1.cpp : 定义应用程序的入口点。
//

#include "framework.h"
#include "WindowsProject1.h"
#include <Windows.h>
HINSTANCE hAppInstance;

#define MAX_LOADSTRING 100

// 此代码模块中包含的函数的前向声明:
ATOM                MyRegisterClass(HINSTANCE hInstance);
BOOL                InitInstance(HINSTANCE, int);
LRESULT CALLBACK    WndProc(HWND, UINT, WPARAM, LPARAM);
INT_PTR CALLBACK    About(HWND, UINT, WPARAM, LPARAM);
LRESULT CALLBACK WindowProc(
	IN  HWND hwnd,
	IN  UINT uMsg,
	IN  WPARAM wParam,
	IN  LPARAM lParam
)
{
	switch (uMsg)
	{
		//窗口消息
	case WM_CREATE:
	{
		DbgPrintf("WM_CREATE %d %d\n", wParam, lParam);
		CREATESTRUCT* createst = (CREATESTRUCT*)lParam;
		DbgPrintf("CREATESTRUCT %s\n", createst->lpszClass);

		return 0;
	}
	case WM_MOVE:
	{
		DbgPrintf("WM_MOVE %d %d\n", wParam, lParam);
		POINTS points = MAKEPOINTS(lParam);
		DbgPrintf("X Y %d %d\n", points.x, points.y);

		return 0;
	}
	case WM_SIZE:
	{
		DbgPrintf("WM_SIZE %d %d\n", wParam, lParam);
		int newWidth = (int)(short)LOWORD(lParam);
		int newHeight = (int)(short)HIWORD(lParam);
		DbgPrintf("WM_SIZE %d %d\n", newWidth, newHeight);

		return 0;
	}
	case WM_DESTROY:
	{
		DbgPrintf("WM_DESTROY %d %d\n", wParam, lParam);
		PostQuitMessage(0);

		return 0;
	}
	//键盘消息
	case WM_KEYUP:
	{
		DbgPrintf("WM_KEYUP %d %d\n", wParam, lParam);

		return 0;
	}
	case WM_KEYDOWN:
	{
		DbgPrintf("WM_KEYDOWN %d %d\n", wParam, lParam);

		return 0;
	}
	//鼠标消息
	case WM_LBUTTONDOWN:
	{
		DbgPrintf("WM_LBUTTONDOWN %d %d\n", wParam, lParam);
		POINTS points = MAKEPOINTS(lParam);
		DbgPrintf("WM_LBUTTONDOWN %d %d\n", points.x, points.y);

		return 0;
	}
	}
	return DefWindowProc(hwnd, uMsg, wParam, lParam);
}

int APIENTRY wWinMain(_In_ HINSTANCE hInstance,
                     _In_opt_ HINSTANCE hPrevInstance,
                     _In_ LPWSTR    lpCmdLine,
                     _In_ int       nCmdShow)
{
	hAppInstance = hInstance;
	LPCWSTR className = (LPCWSTR)"My First Window";

    WNDCLASS wndclass = { 0 };

    wndclass.hbrBackground = (HBRUSH)COLOR_MENU;
    wndclass.lpfnWndProc = WindowProc;
    wndclass.lpszClassName = className;
    wndclass.hInstance = hInstance;

    RegisterClass(&wndclass);

    // 创建窗口
    HWND hwnd = CreateWindow(
        className,
        TEXT("我的第一个窗口"),
        WS_OVERLAPPEDWINDOW,
        10,
        10,
        600,
        300,
        NULL,
        NULL,
        hInstance,
        NULL);

    if (hwnd == NULL)
        return 0;

    // 显示窗口
    ShowWindow(hwnd, SW_SHOW);

	// 更新窗口
	UpdateWindow(hwnd);
    MSG msg;
    while (GetMessage(&msg, NULL, 0, 0))
    {
        TranslateMessage(&msg);
        DispatchMessage(&msg);
    }

    return 0;
}