digitalmars.D.learn - Win32 function vs delegate issues with api
- Prudence (18/18) Sep 08 2015 I have
- Rikki Cattermole (9/25) Sep 08 2015 You have the ability to store some user info along with the pointer.
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?
Sep 08 2015
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
Sep 08 2015