National Instruments IEEE 1394 用户手册

file opens, and all the user attributes are set in the driver. If no camera of the 
same make and model is present, the Initialize function returns an error.

The camera control mode parameter has two options: controller and 
listener. The default option—controller—controls the camera and receives 
video data. The listener only receives video data. Use the listener option in 
broadcasting applications. Refer to the 

 section of Chapter 3, 

, for more 

information about broadcasting.

After initializing the interface, configure the interface for acquisition by 
specifying the following parameters: whether the acquisition is one-shot or 
continuous, the number of internal buffers to use, and the region of interest 
for the acquisition.

During configuration, the driver validates all the user-configurable 
attributes. If any attributes are invalid or out of range, the driver returns an 
error and does not configure the acquisition.

If you want to reconfigure the acquisition, call the Clear Acquisition 
function before calling the Configure function again.

National Instruments recommends that you do not configure an acquisition in a loop 

because doing so is time-intensive.

Use a one-shot acquisition to start an acquisition, perform the acquisition, 
and stop the acquisition using a single function. The number of images 
acquired is equal to the number of images in the images collection.

With a one-shot acquisition, you specify a certain number of internal 
buffers. The camera transfers each image up to and including the specified 
number of buffers. The driver acquires every image during a one-shot 
acquisition. National Instruments recommends one-shot acquisition for 
applications that do not require real-time acquisition or processing.

Use a continuous acquisition to start an acquisition, continuously acquire 
images into the internal buffers, and explicitly stop the acquisition. With 
continuous acquisition, the driver acquires video data continuously from