Retrieves the plug-in version.
EP_GET_VERSION
hwnd = hwndParent;
wParam = cb;
lParam = szVersion;
hwndParent
The window handle of the Plug-ins Settings dialog box.
cb
Specifies the maximum number of characters to copy to the buffer, including the NULL character.
szVersion
Pointer to the buffer that will receive the text.
The return value is the required size for a buffer that can receive the text.