How do I create a UIImage using PDFDraw without writing to disk?

[James]

Q: I'm using iOS. How do I create a UIImage using PDFDraw without writing to disk?

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A: The following code snippet shows how to use PDFDraw to create a UIImage of the first page of a PDFDoc:

PDFDoc* doc = [[PDFDoc alloc] initWithFilepath:file];
Page* page = [doc GetPage:1];
PDFDraw* draw = [[PDFDraw alloc] initWithDpi:dpi];
BitmapInfo* bitmapInfoObject;

@try
{
        bitmapInfoObject = [draw GetBitmap:page pix_fmt:e_bgra demult:NO];
}
@catch (NSException* ex)
{
        NSLog(@"PDFNet could not render.");
}

NSData* data = [bitmapInfoObject GetBuffer];
unsigned char* test = calloc(sizeof(unsigned char)*[bitmapInfoObject getWidth]*[bitmapInfoObject getHeight], sizeof(unsigned char));
[data getBytes:test length:sizeof(unsigned char)*[bitmapInfoObject getWidth]*[bitmapInfoObject getHeight]];
UIImage* testImage = imageFromRawBGRAData(data, [bitmapInfoObject getWidth], [bitmapInfoObject getHeight], YES);

Where the method imageFromRawBGRAData is:

UIImage* imageFromRawBGRAData(NSData* data, int width, int height, bool retinaEnabled)
{
    CGDataProviderRef provider = CGDataProviderCreateWithCFData((__bridge CFDataRef)data);
    const int bitsPerComponent = 8;
    const int bitsPerPixel = 4 * bitsPerComponent;
    const int bytesPerRow = 4 * width;
    CGColorSpaceRef colorSpaceRef = CGColorSpaceCreateDeviceRGB();
    CGBitmapInfo bitmapInfo = kCGImageAlphaPremultipliedFirst | kCGBitmapByteOrder32Little;
    CGColorRenderingIntent renderingIntent = kCGRenderingIntentDefault;

    CGImageRef imageRef = CGImageCreate(width, height, bitsPerComponent, bitsPerPixel, bytesPerRow, colorSpaceRef, bitmapInfo, provider, NULL, NO, renderingIntent);

    CGDataProviderRelease(provider);
    double screenScale = 1;

    if (retinaEnabled && [[UIScreen mainScreen] respondsToSelector:@selector(scale)] == YES)
        screenScale = [[UIScreen mainScreen] scale] ;

    UIImage *myImage = [UIImage imageWithCGImage:imageRef scale:screenScale orientation:UIImageOrientationUp];

    CGImageRelease(imageRef);
    CGColorSpaceRelease(colorSpaceRef);

    return myImage;
}