IMAQdxGetImageDataCW

Format

rval = IMAQdxGetImageDataCW (id As IMAQdxSession, buffer As VARIANT, mode As IMAQdxBufferNumberMode, desiredBufferNumber As Long, actualBufferNumber As Long);

Purpose

Copies the raw data of the specified frame into buffer.

Note  This function allows you to access raw image data. For many uncompressed formats like YUV or RGB, buffer is not compatible with NI Vision. To use the NI Vision functions, use IMAQdxGetImage instead of this function.

Parameters

Parameter	Type	Description
id	IMAQdxSession	A valid Session ID, which you can obtain using IMAQdxOpenCamera.
buffer	VARIANT *	The data of the specified attributes when the function returns.
mode	IMAQdxBufferNumberMode	The buffer number mode of the image to retrieve. Set this parameter to IMAQdxBufferNumberModeNext to get the next buffer, or set this parameter to IMAQdxBufferNumberLast to get the last acquired buffer, or set this parameter IMAQdxBufferNumberModeBufferNumber to acquire a specific cumulative buffer number.
desiredBufferNumber	Long	The cumulative buffer number of the image to retrieve. This parameter is only needed if mode is set to IMAQdxBufferNumberModeBufferNumber.
actualBufferNumber	Long (passed by reference)	On return, the actual cumulative buffer number of the image retrieved.

Return Value

On success, this function returns IMAQdxErrorSuccess. On failure, this function returns an error code. You can obtain a more detailed error message with IMAQdxGetErrorString.