I would like to “read” information from a window not related to my program. If I have a process ID and a window handle:
Process Proc = Process.GetProcessById(ProcID); IntPtr hdl = Proc.MainWindowHandle;
And I have information from spy++ telling me that the control-ID of the element I’m interested in is 00000003EA, how can I access it with C#?
Thanks for your help!
In case anyone is interested, this is how I got it working:
Process p = Process.GetProcessById(ProcID); IntPtr hdl = p.MainWindowHandle; byte buffer = new byte; //Assume that 1024 bytes are enough! Better would be to get the text length.. UTF8Encoding enc = new UTF8Encoding(); uint Test = GetDlgItemText((int)hdl, Convert.ToInt32("0x000003EA", 16), buffer, 1024); string TextFromOtherWindow = enc.GetString(buffer); [DllImport("user32.dll")] public static extern uint GetDlgItemText( int hDlg, //A handle to the dialog box that contains the control. int nIDDlgItem, //The identifier of the control whose title or text is to be retrieved. byte lpString, //The buffer to receive the title or text. int nMaxCount //The maximum length, in characters, of the string to be copied to the //buffer pointed to by lpString. If the length of the string, including //the null character, exceeds the limit, the string is truncated. );
byte buffer is the buffer where the text from the other window is written back to. I assumed that the text is no more than 1024 bytes long, but it would be better to get the actual size…
As far as the encoding goes, a different one might be better suited for your needs.
The Handle in Hex needs to be converted to an integer:
GetDlgItemText was best suited (I think) for my requirement of getting the static text as opposed to “SendMessage” and “WM_GETTEXT”.
Thanks to all who helped point me in the right direction!
Source for GetDlgItemText: MSDN
Hmmm. I spoke too soon... The element ID is changed each time the program is started. I have opened a new question at Persistent Element Identification.
Your best bet is going with the UI Automation.
Though that's not perfect as many applications do not support that.
Also take a look at this answer of mine, similar question, might help with being able to access / 'attach' to other process threads / queues etc.
EDIT: (I forgot to link up on my other post, just corrected:)
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