Question and Answer Database FAQ1055D.txt Avoiding an Application Error when using EM_POSFROMCHAR Category :VCL Platform :All Product :Delphi 3.x Question: How can I avoid an Application Error when using the EM_POSFROMCHAR and EM_POSFROMCHAR in a RichEdit control? Answer: The definitions for EM_CHARFROMPOS and EM_POSFROMCHAR are different in the RichEdit and Messages units: RichEdit unit: EM_POSFROMCHAR = WM_USER + 38; EM_CHARFROMPOS = WM_USER + 39; Messages unit: EM_POSFROMCHAR = 214; EM_CHARFROMPOS = 215; To avoid confusion, these constants have been removed from the RichEdit unit in Delphi 3. When using the EM_POSFROMCHAR message, WParam should contain the address of the point structure that will receive the coordinates, and LParam should contain the zero based offset of the character. The return value is not initialized. Note that the y coordinate can be zero or negative. When using EM_CHARFROMPOS, wparam is not used, and LParam should contain the address of the point structure that will receive the coordinates. The return value should contain the required character index. 7/16/98 4:31:28 PM
Last Modified: 01-SEP-99