Send mouse Click message

Question

How we can make mouse click event in a certain position without moving mouse(I mean that make computer think a position is clicked with mouse) with C++

Answer 1

The SendInput function in windows API will get you started. Have a look at the following link for the definition of the method,its input parameters and return values :
http://msdn.microsoft.com/en-us/library/windows/desktop/ms646310(v=vs.85).aspx

You can follow the links in the page to know more about the structures and data-types used in the function.

Update : You can start with something like this

#include<Windows.h>
int main()
{
    INPUT input;
    input.type=INPUT_MOUSE;
    input.mi.dx=0;
    input.mi.dy=0;
    input.mi.dwFlags=(MOUSEEVENTF_ABSOLUTE|MOUSEEVENTF_MOVE|MOUSEEVENTF_RIGHTDOWN|MOUSEEVENTF_RIGHTUP);
    input.mi.mouseData=0;
    input.mi.dwExtraInfo=NULL;
    input.mi.time=0;
    SendInput(1,&input,sizeof(INPUT));
    return 0;
}

This will automatically move your mouse to the top left corner of the screen and make a right-click. Now, if you mean to make a click somewhere on the screen without moving your mouse, I think that is not possible using SendInput(). You do not need to worry about moving the mouse as your program will do it by itself. That is what the 'MOUSEEVENTF_MOVE' flag tells the program to do. If you do not use the flag, then the click will take place at the current position of your mouse.

Answer 2

You can use SendInput() function to emulate mouse clicks and keyboard strokes:

The SendInput function inserts the events in the INPUT structures serially into the keyboard or mouse input stream. These events are not interspersed with other keyboard or mouse input events inserted either by the user (with the keyboard or mouse) or by calls to keybd_event, mouse_event, or other calls to SendInput.

You can also use SendMessage() or PostMessage() to send the button-press message, e.g.

SendMessage(hWnd, WM_LBUTTONDOWN, MK_LBUTTON, MAKELPARAM(mousePosX, mousePosY));

, but it is less reliable. Note that in this way you may also need to send WM_LBUTTONUP later, depending on the way you handle events in your application.

Also check this question, the accepted answer is pretty detailed.