This program source displays the decoded image source which received data from socket to the screen. There is some problem in this source which I do not know... If I make comment the last end of the code ( [imgview setImage:processedImage] ) it works fine but image doesn't displays. but if I use the code ( [imgview setImage:processedImage] ) in the end of the code the program dies in 5 minute. I would like to know why.....

  retvalue = DecompressFrame(aBuffer, [data length], _rgbdata, buffersize);
   
   size_t pixelsWide = 176;
   size_t pixelsHigh = 144;
   int m_xy_size = pixelsWide * pixelsHigh;
   int             bitsPerComponent = 8;
   int             bitmapByteCount;
   int numberOfCompponents = 3;//CGColorSpaceGetNumberOfComponents(colorSpace); //always returns 3 -> unsupported parameter combination
   int bitsPerPixel = bitsPerComponent * numberOfCompponents;
   int bitmapBytesPerRow   = (pixelsWide * numberOfCompponents);
   bitmapByteCount     = (bitmapBytesPerRow * pixelsHigh);
   CGColorSpaceRef colorSpace = CGColorSpaceCreateDeviceRGB();
  
   // È­¸é µÚÁý±â
   unsigned    char        *imageData;
   imageData = (unsigned char *)malloc(m_xy_size*3);
   memcpy(imageData, _rgbdata, m_xy_size*3 * sizeof(unsigned char));
   int i,j,k;
   for(j=0, k=pixelsHigh-1; j< pixelsHigh; j++, k--)
   { 
    for ( i = 0; i < pixelsWide; i++)
    {
    imageData[(j*pixelsWide+i)*3+2] = imageDataAsInts[(k*pixelsWide+i)+3];
    imageData[(j*pixelsWide+i)*3+1] = imageDataAsInts[(k*pixelsWide+i)*3+1];
    imageData[(j*pixelsWide+i)*3] = imageDataAsInts[(k*pixelsWide+i)*3+2];
    }
   } 
   
   CGDataProviderRef dataProvider = CGDataProviderCreateWithData(NULL, imageData, bitmapByteCount, NULL);
   
   CGImageRef cgImage = CGImageCreate(pixelsWide, pixelsHigh, bitsPerComponent,
              bitsPerPixel, bitmapBytesPerRow, colorSpace, kCGImageAlphaNone, 
              dataProvider, NULL, false, kCGRenderingIntentDefault);
   
   UIImage *processedImage = [UIImage imageWithCGImage:cgImage]; 
   CGDataProviderRelease(dataProvider);
   CGColorSpaceRelease(colorSpace);
   
   [imgview setImage:processedImage];

Well Jin, I don't have an immediate answer for you I'm afraid. You might want to post this question to the cocoa-dev or macosxdev lists, where more people will see it, including pehaps someone who can see what the problem is. Good luck!