🚀 go-pugleaf

"Patryk B." <no.spam@spam.pl> wrote in message 
news:bhxmq2m9ts12.1p5w7pvxgm2as.dlg@40tude.net...

> HHOOK hWin;

That handle needs to be stored in a block of shared memory so that every 
instance of the DLL has access to it.  Use CreateFileMapping() and 
MapViewOfFile() to create such a memory block.

> extern "C" __declspec(dllexport) void _stdcall SetHook(void);
> extern "C" __declspec(dllexport) void _stdcall RemoveHook(void);
> LRESULT CALLBACK CallWndProc(int nCode, WPARAM wParam, LPARAM lParam)

You need to export your hook procedure as well:

    extern "C" __declspec(dllexport) LRESULT CALLBACK CallWndProc(int nCode, 
WPARAM wParam, LPARAM lParam);

> SetWindowLong(hWindow, GWL_EXSTYLE,GetWindowLong(hWindow, GWL_EXSTYLE)
> | WS_EX_LAYERED);

You should check if WS_EX_LAYERED is already applied before re-applying it:

    long exstyle = GetWindowLong(hWindow, GWL_EXSTYLE);
    if( (exstyle & WS_EX_LAYERED) == 0 )
        SetWindowLong(hWindow, GWL_EXSTYLE, exstyle | WS_EX_LAYERED);

> if(LOWORD(msg->wParam==WA_ACTIVE) ||
> LOWORD(msg->wParam==WA_CLICKACTIVE))
> {
> ::SetLayeredWindowAttributes(msg->hwnd, 0, 255, LWA_ALPHA);
> }

Likewise, you should check for WS_EX_LAYERED before calling 
SetLayeredWindowAttributes().

> Ok, code work like it should, inactive windows are transparent,
> active window not. But when im traying to move window it's
> move veeeery slow.

That is because your hook is getting called on every message that every 
window receives.  That is very inefficient.  You might consider using a 
WH_CBT hook instead, checking for the HCBT_ACTIVATE notification.

> When I put for example Beep() instead of setting transparency,
> pc beeping when window changing state but it not laging.

Applying and removing alpha blending is not a trivial task for the OS to 
perform.  So there is going to be some overhead to it.


Gambit