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C语言获取窗口句柄

1.C语言获取控制台程序的句柄

  • 完整代码功能为获取控制台程序的窗口句柄并在窗口用TextOutW写句话
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#include <windows.h>
#include <conio.h>
#include <tchar.h>

int main(int argc, char** argv) {

    TCHAR title[256];//控制台程序标题
    //获取控制台标题
    GetConsoleTitleW(title, 256);
    HWND hwnd1 = FindWindowW(0, title);
    HWND hwnd2 = FindWindowW(L"ConsoleWindowClass", 0);
    HWND hwnd3 = GetConsoleWindow();
    HWND hwnd4 = GetForegroundWindow();
    HWND hwnd = hwnd1;
    HDC hdc = GetDC(hwnd);

    while (TRUE)
    {
        TextOutW(hdc, 10, 10, L"Hello, Windows!", 15);
        Sleep(100);//延时100ms
        if (_getch() == 0x1b)//若按下ESC键跳出循环
        {
            break;
        }
    }
    ReleaseDC(hwnd, hdc);
    return 0;
}

2.C语言获取其他程序的窗口句柄

  • 完整代码功能为获取Notepad的窗口句柄并在窗口用TextOutW写句话
  • vs2022中的spy工具可以查看窗口类名与标题名
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#include <windows.h>
#include <conio.h>
#include <tchar.h>

int main(int argc, char** argv) 
{
    //Notepad为ClassName,Untitled - Notepad为Caption
    HWND hwnd = FindWindowW(L"Notepad", L"Untitled - Notepad");
    HDC hdc = GetDC(hwnd);

    while (TRUE)
    {
        TextOutW(hdc, 10, 10, L"Hello, Windows!", 15);
        Sleep(100);//延时100ms
        if (_getch() == 0x1b)//若按下ESC键跳出循环
        {
            break;
        }
    }
    ReleaseDC(hwnd, hdc);
    return 0;
}

3.C语言根据窗口句柄获得进程句柄

  • 完整代码功能为获取Notepad的进程句柄后，根据句柄结束notepad的进程
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#include <windows.h>
#include <stdio.h>

int main(int argc, char** argv) 
{
    HWND hWnd = FindWindowW(L"Notepad", L"Untitled - Notepad");
	printf("Window Handle is :0x%X\n", hWnd);
	//获取进程的ID
	DWORD pid;
	GetWindowThreadProcessId(hWnd, &pid);
	printf("ProcessId is:%d\n", pid);
	//获取进程的句柄
	HANDLE hProcess = OpenProcess(PROCESS_ALL_ACCESS, FALSE, pid);
	printf("Process Handle is: 0x%X\n", hProcess);
	//根据进程句柄结束进程
	TerminateProcess(hProcess,0);
	CloseHandle(hProcess);
    return 0;
}