Type mismatch: cannot convert from ByteMatrix to BitMatrix

Question

I am creating a QR code generator program in JAVA using ZXING library. The program is

import com.google.zxing.BarcodeFormat;
import com.google.zxing.WriterExcept         


        

Answer 1

Never used this library myself, but reading the errormessage I would assume that you have to problem that you want to store byte in bits. The problem will be that a byte is build up by multiple bits so you cannot represent a byte via only one bit.

Store your encode data into an ByteMatrix and then read this post:

• QR Code encoding and decoding using zxing

to finish things off.

Answer 2

According to the javadoc here and the source code here, the QRCodeWriter.encode methods return a BitMatrix, not a ByteMatrix. So, that compilation error should not occur.

Unless ....

... you are using some version¹ of the com.google.zxing library that is incompatible with those javadocs. Check where you got your zxing JAR file from.

Despite searching, I haven't been able to find the version with this incompatibility. However:

1. I note that the official library has been forked many times on GitHub, and any one of those could be the source of the incompatibility.

2. I found this which clearly a fork, and clearly has tweaked encode. However, the people who did this have at least had the good sense to change the package name!

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I don't know if this is relevant, but it appears that in the C# version of this API, the QRCodeWriter.encode method does return a ByteMatrix; see here for evidence. Maybe you've stumbled across someone's misguided attempt to "fix" the Java API to match the C# API.

Answer 3

I got the same Issues and i solve it by downloading compatible zxing-javase.jar and zxing

http://www.java2s.com/Code/Jar/z/Downloadzxingjavasejar.htm http://www.java2s.com/Code/Jar/z/Downloadzxingjar.htm

the latest version are compatible and use ByteMatrix not BitMatrix. download them from original www.java2s.com