THORLABS DCU22 Series User Manual

324 DCx camera
© 2010 Thorlabs
7.5.7
is_LockDDOverlayMem
USB 2.0
-
Syntax
INT is_LockDDOverlayMem(HIDS hCam, void** ppMem, INT* pPitch)
Description
This function is obsolete and should not be used anymore. We recommend to use the
is_DirectRenderer() function instead (see also Obsolete Functions ).
In DirectDraw BackBuffer mode, is_LockDDOverlayMem() enables access to the overlay memory
and returns the pointer to the starting address of the overlay buffer. This way, you can write data
directly to the overlay buffer without the need to use the Windows GDI functions.
pPitch returns the line offset (in bytes) from the beginning of a line to the beginning of the next line.
Make sure to release the memory again as early as possible using the is_UnlockDDOverlayMem()
function.
While a LockDDOverlayMem...UnlockDDOverlayMem block is executed, the contents of the overlay
buffer will not be refreshed on the screen.
Input Parameters
hCam
Camera handle
ppMem
Pointer to the variable that holds the address pointer
pPitch
Pointer to the variable that holds the pitch value
Return Values
IS_SUCCESS
Function executed successfully
IS_NO_SUCCESS
General error message
Related Functions
Is_UnlockDDOverlayMem()
is_LockDDMem()
is_UnlockDDMem()
is_LockSeqBuf()
is_UnlockSeqBuf()
130 316
338
338
323
337
203
291

THORLABS DCU22 Series Specifications

General

Brand	THORLABS
Model	DCU22 Series
Category	Security Camera
Language	English