Flutter将Image转换为base64,将string64转换为Image
您好,我想将Image转换为base64字符串,然后再将其转换回Image。这是我的方法:
File pickedImage = await ImagePicker.pickImage( source: ImageSource.gallery
);
List<int> test = pickedImage.readAsBytesSync();
String test2 = base64Encode(test);
Uint8List test3 = base64Decode(test2);
File test4 = new File.fromRawPath(test3);
FirebaseVisionImage ourImage = FirebaseVisionImage.fromFile(test4);
我收到一个错误,当我想打印test4时,我仅收到问号。当我打印pickleImage时,我得到这个:
File: '/storage/emulated/0/WhatsApp/Media/WhatsApp Images/IMG-20190503-WA0005.jpg'
回答:
您似乎已经在完成将图像转换为base64并返回的所有工作:
List<int> imageBytes = pickedImage.readAsBytesSync();String imageB64 = base64Encode(imageBytes);
Uint8List decoded = base64Decode(imageB64);
至于为您使用它FirebaseVisionImage
,我不确定我能提供多少帮助,因为我对该类没有经验(我假设您正在使用firebase_ml_vision库)。然而,看着来源的FirebaseVisionImage
,有一个工厂构造fromBytes
以及fromFile
,虽然这是一个有点更复杂的使用。但是,如果您可以使其正常运行,则可能是更适合您需要的构造函数:
// Metadata values based on an RGBA-encoded 1920x1080 image// You will have to change these values to fit your specific images
final planeMetadata = FirebaseVisionImagePlaneMetadata(
width: 1920,
height: 1080,
bytesPerRow: 1920 * 4,
);
final metadata = FirebaseVisionImageMetadata(
size: Size(1920, 1080),
planeData: planeMetadata,
// From https://developer.apple.com/documentation/corevideo/1563591-pixel_format_identifiers?language=objc
// kCVPixelFormatType_32RGBA
rawFormat: 'RGBA',
);
final visionImage = FirebaseVisionImage.fromBytes(decoded, metadata);
另外,您可以将字节保存到一个临时文件中并使用:
// Assuming the source image is a PNG imageFile imgFile = File('tempimage.png');
imgFile.writeAsBytesSync(decoded.ToList());
final visionImage = FirebaseVisionImage.fromFile(imgFile);
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