App craches, the package bluetooth_print can't print images on ios, it's working in android but doesn't work in iOS

[HamzaMihfad]

Here is the error message in xCode:

Exception NSException * "UIGraphicsBeginImageContext() failed to allocate CGBitampContext: size={0, 0}, scale=1.000000, bitmapInfo=0x2002. Use UIGraphicsImageRenderer to avoid this assert." 0x00000002837dae50

[aargjjendi]

I'm having the same issue, did you find any solution ?

[Scuttman]

I was having the same issue in Android. I noticed that the example app on pub.dev had the line to show the image commented out!

However, I discovered that the error is because the image size has not been set. For the image, you have to set an int value under width:200 for example. This then works. Have not tested in IOS but not setting the width caused a compile error. Once the width was set, error was removed and image printed.

printList.add(LineText(type: LineText.TYPE_IMAGE, width:200, content: base64Image, align: LineText.ALIGN_CENTER, linefeed: 1));

[Niagawan-mave]

I am also facing the same issues, did anyone have the solution ?
I have set the width and height to 100. it work great in android, but in IOS it cannot print image, it show the error above

[Niagawan-mave]

I have solved the problem but adding resizing code in IOS
You can go to ios/Classes/BluetoothPrintPlugin.m
Then look for function mapToEscCommand, within it have a part is else if([@"image" isEqualToString:type]){
replace the code below will solved the ios printer image cannot print problem

else if([@"image" isEqualToString:type]){
NSData *decodeData = [[NSData alloc] initWithBase64EncodedString:content options:0];
UIImage *image = [UIImage imageWithData:decodeData];
// Define the maximum width
CGFloat maxWidth = 100.0; // Adjust the maximum width as needed

        // Calculate the target size while maintaining the original aspect ratio
        CGSize originalSize = image.size;
        CGFloat scaleFactor = maxWidth / originalSize.width;
        CGSize targetSize = CGSizeMake(originalSize.width * scaleFactor, originalSize.height * scaleFactor);

        // Create a renderer with the calculated target size
        UIGraphicsImageRenderer *renderer = [[UIGraphicsImageRenderer alloc] initWithSize:targetSize];

        // Render the image and get a new data representation
        NSData *renderedImageData = [renderer JPEGDataWithCompressionQuality:1 actions:^(UIGraphicsImageRendererContext * _Nonnull context) {
            [image drawInRect:CGRectMake(0, 0, targetSize.width, targetSize.height)];
        }];
        UIImage *resizedImage = [UIImage imageWithData:renderedImageData];
        [command addOriginrastBitImage:resizedImage];
    }

[HamzaMihfad]

@Niagawan-mave thanks a lot, finally it's working on ios now

did you create a new package on pub.dev? or just forked it to your github account?

[Niagawan-mave]

@HamzaMihfad I just forked to my github account