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;
}