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[REBOL] Re: External library interface

From: ptretter:charter at: 2-Jul-2003 19:20

Well for example here is the GetWindowText function from Microsoft WINAPI as I have used it (commented): getwindowtext: make routine! [ {The GetWindowText function copies the text of the specified window's title bar (if it has one) into a buffer.} hWnd [integer!] "[in] Handle to the window or control containing the text." lpString [string!] "[out] Pointer to the buffer that will receive the text." nMaxCount [integer!] "[in] Specifies the maximum number of characters to copy to the buffer, including the NULL character." return: [integer!] {If the function succeeds, the return value is the length, in characters, of the copied string, not including the terminating NULL character.} ] winlib "GetWindowTextA" str: make string! "" ; needed to hold windows title and passed to the getwindowtext routine. loop 200 [append str "^@"] getwindowtext-ret: handle-to-a-window getwindow-next-ret str 200