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M stuck M trying to create an UIImage from a byte array which i get from a webservice.It comes embedded in a XML.I can parse the XML and get the byte array as a string.Then I convert the byte array (which is in NSString) to NSData. This is the code for that:-

    Image_Content = currentElementValue;

    NSData* aDataImage;
    aDataImage = [Image_Content dataUsingEncoding: NSASCIIStringEncoding];
        UIImage *Image_From_Array = [[UIImage alloc] initWithData:aData];

Can I save this file in certain format as jpg or png? I want to save this image as a file so i can later use it in the HTML (this image is linked in the HTML).

Can any body help?

Thanks.

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  • What format is the image data sent as? If you receive a JPG you can only save it as a JPG unless you convert it to a different format. You cannot simply choose what format you want, it needs to be the format the image you received is. Commented Jun 5, 2009 at 7:15

2 Answers 2

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To write your data to the filesystem, use:

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];

NSString* fileName = [NSString stringWithFormat:@"%@/%@", documentsDirectory,  aFileName];
BOOL writeSuccess = [imageData writeToFile:fileName atomically:NO];

Then to reload it later do the same:

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
NSString *documentsDirectory = [paths objectAtIndex:0];

NSString* fileName = [NSString stringWithFormat:@"%@%@", documentsDirectory,  aFileName];

    image = [UIImage imageWithContentsOfFile:fileName];

You can also change your complression type by creating your image and generating the imageData using UIImageJPEGRepresentation and UIImagePNGRepresentation to generate the data you write to the filesystem.

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Have a look at the functions UIImageJPEGRepresentation and UIImagePNGRepresentation.

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