EM_GETFIRSTVISIBLELINE  1B2VKUM 

An application sends an EM_GETFIRSTVISIBLELINE message to determine the uppermost visible line in an edit control.

EM_GETFIRSTVISIBLELINE

wParam = 0; // not used; must be zero

lParam = 0; // not used; must be zero

Parameters

This message has no parameters.

Return Values

The return value is the zero-based index of the uppermost visible line in a multiline edit control. For single-line edit controls, the return value is the zero-based index of the first visible character.