GetWindowText API?

[wbjohnson]

ooooook guys heres a little tinker for ya! im trying to read some fields from Flash FXP (in c#) using the Windows User32 API... GetWindowText is what il be using... so i use Microsoft Spy++ to get the Handle for one of the input boxes, lets say for arguments sake its 4134644.. (thats the handle to the text box...) Spy++ reports this as an EDIT class, good so far! so i use GetWindowText to try get the text from the text box.... empty string?? mmmmm so im stratching my head... i know ill test my code and use: static extern int GetWindowTextLength(IntPtr hWnd) this has got to work! i should get a length back now!! NOPE! nothing is coming back from ANY EDIT class field HOWEVER if i use GetWindowText on anything else, Labels, Window Titles it works!! What am i doing wrong here? Am i using the wrong API call to get data from an Edit Field? its driving me mad!!! lol

[Dave Kreskowiak]

wbjohnson wrote:

this has got to work!

No, it doesn't! Just because the control derives from EDIT does NOT mean that you can use this, or any other method you want for getting the text out of the control. It will only work if the control responds to WM_GETTEXT, which not every EDIT control does.

Dave Kreskowiak Microsoft MVP - Visual Basic

[wbjohnson]

ah hah!! that explains alot! thanks! can i send the WM_GETTEXT command and then read the message buffer? assuming the control supports this command? Cheers dude!:-D

[Dave Kreskowiak]

Yes. You might want to try these[^]. You might also want to look at the limitations of GetWindowText[^].

Dave Kreskowiak Microsoft MVP - Visual Basic

[wbjohnson]

[DllImport("user32.dll")] public static extern int SendMessage(IntPtr hWnd, IntPtr Msg, IntPtr wParam, [MarshalAs(UnmanagedType.LPArray)] byte[] lParam); int __titleLength = SendMessage(hWnd, WM_GETTEXTLENGTH, IntPtr.Zero, null); byte[] __data = new byte[__titleLength]; SendMessage(hWnd, WM_GETTEXT, new IntPtr(__data.Length), __data); foreach (byte __b in __data) Console.Write((char)__b); this loks like its working!!!