Thread: Middle button mouse capture in another program

I got a problem.

I am making a DLL that needs to know when, in another program, user will press the middle mouse button and the mouse coord.

Which functions can I use?

Please help me.

Is it doable to see other programs' mouse event or not?

Answering a question with a question. Now that is a true sign of intelligence. I'm pretty sure that you may be able to do this but it may not be as simple as you think. I'm sure that you can do it using some win32 api calls. However, I would try and find the memory location of the process. If you can do that then you can grab its WM_MBUTTON* messages. You must realize that I just made that sound easier than it actually is.

Now this one is error prone but it may do the trick. Keep track of the mouse's position and assume that it is whatever window has focus. BUT that assumes way too much to be a dependable way of accomplishing what you need it to.

GetMsgProc:

The GetMsgProc hook procedure is an application-defined or library-defined callback function that the system calls whenever the GetMessage function has retrieved a message from an application message queue. Before passing the retrieved message to the destination window procedure, the system passes the message to the hook procedure.

LRESULT CALLBACK GetMsgProc(

int code, // hook code
WPARAM wParam, // removal flag
LPARAM lParam // address of structure with message
);
Parameters

code

Specifies whether the hook procedure must process the message. If code is HC_ACTION, the hook procedure must process the message. If code is less than zero, the hook procedure must pass the message to the CallNextHookEx function without further processing and should return the value returned by CallNextHookEx.

wParam

Specifies whether the message has been removed from the queue. This parameter can be one of the following values:

Value Meaning
PM_NOREMOVE Specifies that the message has not been removed from the queue. (An application called the PeekMessage function, specifying the PM_NOREMOVE flag.)
PM_REMOVE Specifies that the message has been removed from the queue. (An application called GetMessage, or it called the PeekMessage function, specifying the PM_REMOVE flag.)
lParam

Points to an MSG structure that contains details about the message.

Return Values

The return value should be zero.

Remarks

The GetMsgProc hook procedure can examine or modify the message. After the hook procedure returns control to the system, the GetMessage function returns the message, along with any modifications, to the application that originally called it.
An application installs this hook procedure by specifying the WH_GETMESSAGE hook type and the address of the hook procedure in a call to the SetWindowsHookEx function.
GetMsgProc is a placeholder for the application-defined or library-defined function name.

See Also

CallNextHookEx, GetMessage, MSG, PeekMessage, SetWindowsHookEx

Could you help me with setcapture? I am.. kinda a beginner.