What functions does windows.h have?

windows.h functions include: 1. FindWindow function, which can find a specific window handle through the window class name or window title name; 2. SendMessage function, used to send instructions to the window corresponding to the handle; 3. WindowFromPoint function and so on.

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Commonly used functions in C language windows.h library

1: FindWindow function

This function can find a specific window handle through the window class name or window title name. The return value is the handle of the window (in Windows, the handle is a system Reference to the internal data structure. For example, when you operate a window, or a Delphi form, the system will give you a handle to the window, and the system will notify you: you are operating window No. 142, and your application will Can ask the system to perform operations on window No. 142 - move the window, change the window size, minimize the window, etc. In fact, many Windows API functions take the handle as its first parameter, such as GDI (Graphics Device Interface) handle, Menu handles, instance handles, bitmap handles, etc., are not limited to window functions. In other words, a handle is an internal code through which it can refer to special elements controlled by the system, such as windows, bitmaps, icons, memory blocks , cursor, font, menu, etc.)

Function usage

#include "stdafx.h"
#include<windows.h>
int main() {
    HWND window;    //定义一个窗口句柄变量，用来储存窗口句柄
    /*FindWindow("这里填窗口类名","这里填窗口标题名")
    窗口类名和窗口标题名可以只填一个，不填的用NULL填充*/
    window = FindWindow(NULL,"文本.txt - 记事本");  //查找标题为"文本.txt - 记事本"的窗口
    SendMessage(window,WM_CLOSE,0,0);              //向窗口发送关闭指令
    return 0;
}

2: SendMessage function

The SendMessage function has just been used in the first example. The function of this function The function is to send instructions to the window corresponding to the handle

Function usage

#include "stdafx.h"
#include<windows.h>
int main() {
    POINT mouse;
    HWND window;
    while (1) {
        GetCursorPos(&mouse);
        window = WindowFromPoint(mouse);
        /*SendMessage(窗口句柄,消息类型,消息附带内容,消息附带内容)
        比如我这里选定的消息类型是WM_CHAR
        消息附带内容为WPARAM(&#39;a&#39;)
        所以消息附带内容就是模拟键盘向窗口输入a*/
        SendMessage(window,WM_CHAR,WPARAM(&#39;a&#39;),0);
        Sleep(100);
    }
    return 0;
}

3: WindowFromPoint function

In the second example we use a function called WindowFromPoint. This function The function is to obtain the handle of the clicked window through mouse click

Function usage

#include "stdafx.h"
#include<windows.h>
int main() {
    POINT mouse;        //定义一个结构体变量储存鼠标位置
    HWND window;
    while (1) {
        GetCursorPos(&mouse);   //获取到当前鼠标位置
        /*WindowFromPoint(鼠标位置变量名)*/
        window = WindowFromPoint(mouse);
        SendMessage(window,WM_CLOSE,0,0);
        Sleep(100);
    }
    return 0;
}

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