using libfg library

This is a discussion on using libfg library within the C Programming forums, part of the General Programming Boards category; Hello, I downloaded the libfg library which is a high-level library for interfacing with video4linux and capturing frames from video ...

  1. #1
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    using libfg library

    Hello, I downloaded the libfg library which is a high-level library for interfacing with video4linux and capturing frames from video devices. Are the statements "FRAMEGRABBER* fg = NULL" and "FRAME* fr = NULL" declaring pointers?? I am confused why the asterisk is not on the opposite side. Furthermore, is FRAMEGRABBER a function name, and fg a variable?

    Code:
    #define TV_ABC 64.250f   
        
    void test()   
    {   
      FRAMEGRABBER* fg = NULL;   
      FRAME* fr = NULL;   
        
      // Open the default device   
        
      fg = fg_open( NULL );   
        
      // Capture from our VCR   
        
      fg_set_source( fg, FG_SOURCE_COMPOSITE );   
        
      // Take a snap   
        
      fr = fg_grab( fg );   
      frame_save( fr, vcr.pgm );   
        
      // Now get ABC TV   
        
      fg_set_source( fg, FG_SOURCE_TV );   
      fg_set_tuner( fg, TV_ABC );   
        
      // Take a snap   
        
      fg_grab_frame( fg, frame );   
      frame_save( fr, ABC.pgm );   
        
      frame_release( fr );   
      fg_close( fg );   
    }

  2. #2
    C++ Witch laserlight's Avatar
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    Quote Originally Posted by samz07
    Are the statements "FRAMEGRABBER* fg = NULL" and "FRAME* fr = NULL" declaring pointers?? I am confused why the asterisk is not on the opposite side.
    Yes, and read: Is ``int* p;'' right or is ``int *p;'' right?

    Quote Originally Posted by samz07
    Furthermore, is FRAMEGRABBER a function name, and fg a variable?
    With the given information I would say that FRAMEGRABBER is a type name and fg is a variable name.
    Quote Originally Posted by Bjarne Stroustrup (2000-10-14)
    I get maybe two dozen requests for help with some sort of programming or design problem every day. Most have more sense than to send me hundreds of lines of code. If they do, I ask them to find the smallest example that exhibits the problem and send me that. Mostly, they then find the error themselves. "Finding the smallest program that demonstrates the error" is a powerful debugging tool.
    Look up a C++ Reference and learn How To Ask Questions The Smart Way

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