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USB 2.0 GigE |
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Syntax
INT is_LockDDOverlayMem(HIDS hCam, void** ppMem, INT* pPitch)
Description
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This function is obsolete and should not be used anymore. We recommend to use the is_DirectRenderer() function instead. |
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_LockSeqBuf()
•is_UnlockSeqBuf()
