Справочник Пользователя для National Instruments Image Acquisition Software

Chapter 3

Programming with NI-IMAQ

©

 National Instruments Corporation

3-17

Figure 3-7.  Composite StillColor Snap Programming Flowchart

The 

SCSnap.c

 example demonstrates how to perform a single, composite 

StillColor snap. The example first opens an interface and a session. The 
example then uses 

imgSetAttribute

 to enable and configure StillColor 

mode to acquire a composite image. The example also configures the 
image data representation to 32-bit RGB mode. 

imgSnap

 acquires a 

StillColor image and returns the image data in the buffer. After the example 
processes the image, it calls 

imgClose

 to close the handles and free all of 

the resources associated with the interface.

imgInterfaceOpen

imgInterfaceOpen

 opens

and configures the interface
according to the file setup by the 
IMAQ Configuration Utility

.

imgSessionOpen

 opens a session that

will be used for all acquisition and configuration.

User-specific image processing.

imgClose

 closes the interface and session.

imgSnap

 acquires an image into a buffer. The

buffer may be passed into 

imgSnap

 or automatically

allocated by NI-IMAQ. If no buffer is passed into

imgSnap

, then 

imgSnap

 will automatically snap into

a new buffer and return a pointer to the buffer.

imgSessionOpen

imgSnap

User-Specific Functions

imgClose

imgSetAttribute

 configures the StillColor 

mode to acquire a StillColor image from  
a composite source using the attribute 
IMG_ATTR_COLOR_MODE. 

imgSetAttribute

imgSetAttribute

 configures the image

representation for 32-bit RGB mode using the attribute
IMG_ATTR_COLOR_IMAGE_REP.

imgSetAttribute

UM.book  Page 17  Monday, July 13, 1998  9:49 AM