如何模拟按下鼠标并保持在C＃中

Question

I hope to simulate a left mouse button click on another window, and hold the button for about 2 seconds. I have tried the following code:

        int WM_LBUTTONDOWN = 0x0201;
        int WM_LBUTTONUP = 0x0202;
        SendMessage(hd, WM_LBUTTONDOWN, new IntPtr(1), lParam);           
        Thread.Sleep(2000);
        SendMessage(hd, WM_LBUTTONUP, new IntPtr(1), lParam);

The parameter "hd" is the handle of another window and "lParam" contains coordinate infomation. But it didn't work as my expectation.I used breakpoint to debug the code. When "WM_LBUTTONDOWN" message was sent to another window, the push button in another window was clicked immediately, rather than be held and wait for the message "WM_LBUTTONUP".

When I used real mouse to click and hold the button, spy++ showed that there are not any other messages except "WM_MOUSEMOVE" between "WM_LBUTTONDOWN" and "WM_LBUTTONUP". Picture of Spy++ showed

So, how to simulate mouse button down and being hold in C#? Any advice would be helpful, thank you!

Answer 1

You can't simulate keyboard input by sending window messages . You need to use SendInput() instead ( C# declaration ).

See: Send keys through SendInput in user32.dll .

Answer 2

API函数“ mouse_event”可以解决问题。但是副作用是鼠标实际上会移动，在程序运行时您不能移动鼠标，否则会意外单击错误的位置。