TopCatTom
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how to pass a function as parameter (creating a callback function)
hi,
I'm new to Powerbuilder Programming, so I come up with a simple question.
How can I pass a function as an argument to another function?
What I want to do is:
I want to get a list of all windows (including dialogs) that are visible on the screen. Therefore I use the API-function
long EnumWindows(long hwnd, long lParam) library 'user32.dll'
To this function I have to provide a callback function (as first parameter) that is called if EnumWindows() finds a window.
It should look somehow like this: EnumWindows(ADDRESS_OF(of_
Tom
I'm new to Powerbuilder Programming, so I come up with a simple question.
How can I pass a function as an argument to another function?
What I want to do is:
I want to get a list of all windows (including dialogs) that are visible on the screen. Therefore I use the API-function
long EnumWindows(long hwnd, long lParam) library 'user32.dll'
To this function I have to provide a callback function (as first parameter) that is called if EnumWindows() finds a window.
It should look somehow like this: EnumWindows(ADDRESS_OF(of_
Tom
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I made what you are trying. What I recomend you is to use the following APIs.
Private Function Long GetWindow(long haWnd, long wCmd) Library "user32"
Private Function Long GetWindowTextA (long hWind, ref String lpString, long cch) Library "user32"
Private Function Long GetWindowTextLengthA(long hanWnd) Library "user32"
Private Function Boolean IsWindowVisible (long handWnd) Library "user32"
I you need something else please tell me.