Re: Want to create a function which returns a value obtained from a callback function
On 23 Feb 2007 08:20:43 -0800, "Angus" <email@example.com> wrote:
I want to write a C++ function which returns a Windows handle. I need
to call a callback function to find the Window. The specific function
As the final parameter of EnumChildWindows I can pass a pointer back
to my class. so I can access class functions ok. I thought that I
could have a member variable in the class which is an HWND. Then the
this variable could be updated by EnumChildWindows if a window handle
is found. then when the function returns I just take the value in the
variable as the first found windows handle.
I suppose that would work but it doesn't feel so elegant. Has anyone
got any better ideas?
Define a class in an anonymous namespace and use it like this:
explicit Args(MyClass& obj)
// WindowFinder is a static member function
EnumChildWindows(hWnd, &WindowFinder, reinterpret_cast<LPARAM>(&args));
MyClass::WindowFinder(HWND hWnd, LPARAM lParam)
Args* args = reinterpret_cast<Args*>(lParam);
Visual C++ MVP
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