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I have the following problem. I have C code that acquires a PNG image as basically raw data and keeps it in memory. I would like this raw data to be translated to a BufferedImage in Java, through the use of JNI. Does anyone know any way of doing this or has done this before?
I’ll assume you know the basics of how to call functions with JNI. It’s not that complicated, although it can be a pain in the ass.
If you want to get it done quickly, just write the PNG to a temp file, pass the file name up through JNI and load it using ImageIO.
If you want to get more sophisticated, and avoid needing a file path, you can use ImageIO.read(InputStream) on a ByteArrayInputStream that wraps a byte array you pass in through JNI. You can call NewByteArray() from C and then use SetByteArrayRegion to set the data.
Finally, you might consider using HTTP to transfer the data, Apache has a set of components you can use that include a little web server, you can POST from your C code to Java.