Suraj Bhawal Suraj Bhawal - 3 years ago 443
C# Question

Global Mouse Hook in WPF

I need to get mouse position on screen NOT inside my application.

I've used Global mouse and keyboard hook here

It works fine under winforms but won't work under wpf.

I'm using version1 of the code and used the following

UserActivityHook activity=new UserActivityHook();
activity.OnMouseActivity += activity_OnMouseActivity;


but instead of working it give me following error:


Additional information: The specified module could not be found


under for following code

public void Start(bool InstallMouseHook, bool InstallKeyboardHook)
{
// install Mouse hook only if it is not installed and must be installed
if (hMouseHook == 0 && InstallMouseHook)
{
// Create an instance of HookProc.
MouseHookProcedure = new HookProc(MouseHookProc);
//install hook
hMouseHook = SetWindowsHookEx(
WH_MOUSE_LL,
MouseHookProcedure,
Marshal.GetHINSTANCE(
Assembly.GetExecutingAssembly().GetModules()[0]),
0);
//If SetWindowsHookEx fails.
if (hMouseHook == 0)
{
//Returns the error code returned by the last unmanaged function called using platform invoke that has the DllImportAttribute.SetLastError flag set.
int errorCode = Marshal.GetLastWin32Error();
//do cleanup
Stop(true, false, false);
//Initializes and throws a new instance of the Win32Exception class with the specified error.
throw new Win32Exception(errorCode);
}
}
}


Is there any alternative for WPF or am I missing something?

Answer Source

dotctor's answer gives the mouse position, but not the event I was looking for...

So I figured out on my own. Here are my findings for future reference.

We need to change:

//install hook
hMouseHook = SetWindowsHookEx(
                WH_MOUSE_LL,
                MouseHookProcedure,
                Marshal.GetHINSTANCE(
                    Assembly.GetExecutingAssembly().GetModules()[0]),
                0);

to the following:

//install hook
hMouseHook = SetWindowsHookEx(
                WH_MOUSE_LL,
                MouseHookProcedure,
                IntPtr.Zero,
                0);

Alternatively you can just download the edited cs file from here then we can use the event

activity.OnMouseActivity += activity_OnMouseActivity;

under which we can use e.X and e.Y to get mouse position.

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