How to get mouse events from outside of program window

Question

I want to drag this character. Image :

enter image description here

so i use this method to get mouse position:

WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
    ...
    switch (message){
    case WM_LBUTTONDOWN:
    case WM_MOUSEMOVE:
        GetCursorPos(&mousePosition);
        break;
    }
    ...
}

The program seems to be running well, but if the mouse is out of the characters location, it wouldn't follow the mouse cursor anymore.

How can I fix this problem?

Your link doesn't work. Permission denied.

Stefan Falk
– Stefan Falk

2014-05-03 09:52:40 +00:00
Commented May 3, 2014 at 9:52 — Stefan Falk
– Stefan Falk, Commented May 3, 2014 at 9:52

Roman Ryltsov · Accepted Answer · 2014-05-03 09:56:01Z

5

See SetCapture on MSDN:

Sets the mouse capture to the specified window belonging to the current thread. SetCapture captures mouse input either when the mouse is over the capturing window, or when the mouse button was pressed while the mouse was over the capturing window and the button is still down. Only one window at a time can capture the mouse.

SetCapture..ReleaseCapture lets you temporarily extend your mouse event handling to space outside the window [where the event originated from].

You have some sample/demo here:

switch (uMsg) 
{ 
   case WM_LBUTTONDOWN: 

        // Capture mouse input. 
        SetCapture(hwndMain); // <<--- Here we go

answered May 3, 2014 at 9:56

Roman Ryltsov

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