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Text Box read

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Hello,

does anyone know how to read data from the Box text?

I am using the following code to read data from a file:
g_fileh = OpenFile ("GPSlocation.txt", VAL_READ_ONLY, VAL_OPEN_AS_IS, VAL_ASCII);
read_number = ReadLine (g_fileh, line, 500);
SetCtrlVal (panelHandle, PANEL_BESTGPSPOS, line);
DecodeGPS (line);

read_number = ReadLine (g_fileh, line, 500);
SetCtrlVal (panelHandle, PANEL_INSPVA, line);
DecodeGPS (line);
CloseFile (g_fileh);

Which command instead of ReadLine should I use for read directly from texBox?

Thank you for your help.

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