The
DM_SETTEXTPTR message is sent to the dialog manager
to set a new string value for an edit line or a new caption for an item.
Unlike the
DM_SETTEXT message, this message works with a string pointer.
The ID of the dialog item for which the text should be changed.
Pointer to the string containing the new text. If this parameter is equal to NULL the message does nothing.
Size of the new dialog item string NOT including terminating character '\0'.