Re: Win32 function vs delegate issues with api

[Rikki Cattermole via Digitalmars-d-learn]

On 09/09/15 12:18 PM, Prudence wrote:

I have

hook = SetWindowsHookEx(WH_MOUSE, &Proc, NULL, ThreadID);

Proc is the standard hook proc:

public extern (Windows) LRESULT Proc(int code, WPARAM wParam, LPARAM
lParam)

I get a type mismatch because Proc is a delegate and SetWindowsHookEx
expects a function. Making proc static works but not the behavior I want
since all this stuff is wrapped in a class.

Is there any way to pass Proc to SetWindowsHookEx without issues of GB
and such?



Error: function windows.winuser.SetWindowsHookExA (int, extern (Windows)
int function(int, uint, int), void*, uint) is not callable using
argument types (const(int), extern (Windows) int delegate(int code, uint
wParam, int lParam), void*, uint)

I could cast Proc to a function, obviously, but I'll loose the delegate
behavior and create problems when I try to use this inside Proc?


You have the ability to store some user info along with the pointer. 
Store an integer. Use a global (private) array to map the integer to the 
actual delegate. Use a free function as the proc function.


Of course, that has some indirection thats to the lookup. You could if 
able to rewrite as the free-function and pass in the class as user data, 
you could be smart about it ;)


https://github.com/Devisualization/window/blob/master/platforms/win32/devisualization/window/window.d#L384
https://github.com/Devisualization/window/blob/master/platforms/win32/devisualization/window/window.d#L401

Win32 function vs delegate issues with api

[Prudence via Digitalmars-d-learn]

I have

hook = SetWindowsHookEx(WH_MOUSE, &Proc, NULL, ThreadID);   

Proc is the standard hook proc:

public extern (Windows) LRESULT Proc(int code, WPARAM wParam, 
LPARAM lParam)


I get a type mismatch because Proc is a delegate and 
SetWindowsHookEx expects a function. Making proc static works but 
not the behavior I want since all this stuff is wrapped in a 
class.


Is there any way to pass Proc to SetWindowsHookEx without issues 
of GB and such?




Error: function windows.winuser.SetWindowsHookExA (int, extern 
(Windows) int function(int, uint, int), void*, uint) is not 
callable using argument types (const(int), extern (Windows) int 
delegate(int code, uint wParam, int lParam), void*, uint)		


I could cast Proc to a function, obviously, but I'll loose the 
delegate behavior and create problems when I try to use this 
inside Proc?