hwndDlg (HWND) - input

Parent-window handle.

idItem (ULONG) - input

Identity of the child window whose text is to be queried.

It must be greater or equal to 0 and less or equal to 0xFFFF.

lMaxText (LONG) - input

Length of pszText.

It must be greater or equal to 0.

pszText (PSZ) - output

Output string.

This is the text string that is obtained from the dialog item.

ulRetLen (ULONG) - returns

Actual number of characters returned.
• Error occurred Other
  Actual number of characters returned, not including the null-terminating character. The maximum value is (lMaxText-1).

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