EM_GETHANDLE
wParam = 0; /* not used, must be zero */
lParam = 0L; /* not used, must be zero */An application sends an EM_GETHANDLE message to retrieve a handle to the memory currently allocated for a multiline edit control. The handle is a local memory handle and can be used by any of the functions that take a local memory handle as a parameter.
This message is processed only by multiline edit controls.
This message has no parameters.
The return value is a local memory handle identifying the buffer that holds the contents of the edit control. If an error occurs, such as sending the message to a single-line edit control, the return value is zero.
An application can send this message to a multiline edit control in a dialog box only if it created the dialog box with the DS_LOCALEDIT style flag set. If the DS_LOCALEDIT style is not set, the return value is still nonzero, but the return value will not be meaningful.
This example sends an EM_GETHANDLE message to a multiline edit control and calls the LocalSize function to determine the current size of the edit control using the handle returned by the EM_GETHANDLE message:
HANDLE hmemMle;
WORD cbMle;
hmemMle = (HLOCAL) SendDlgItemMessage(hdlg, ID_MYEDITCONTROL,
EM_GETHANDLE, 0, 0L);
cbMle = LocalSize(hmemMle);