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That function is not defined, perhaps you copy paste this code from somewhere.

該函數未定義,也許您從某處復制粘貼此代碼。

A quick google search points to this link:

快速谷歌搜索指向此鏈接:

https://code.google.com/p/picturesque/source/browse/myClasses/GetBytesFromFile.java?r=1d9332c4c969b4d35847c10f7c83b04c1ccb834f

package myClasses;
import java.util.*;
import java.io.*;

public class GetBytesFromFile {

        public static byte[] getBytesFromFile(File file) throws IOException {
                InputStream is = new FileInputStream(file);

                // Get the size of the file
                long length = file.length();

                // You cannot create an array using a long type.
                // It needs to be an int type.
                // Before converting to an int type, check
                // to ensure that file is not larger than Integer.MAX_VALUE.
                if (length > Integer.MAX_VALUE) {
                        // File is too large
                }

                // Create the byte array to hold the data
                byte[] bytes = new byte[(int)length];

                // Read in the bytes
                int offset = 0;
                int numRead = 0;
                while (offset < bytes.length
                           && (numRead = is.read(bytes, offset, Math.min(bytes.length - offset, 512*1024))) >= 0) {
                        offset += numRead;
                }

                // Ensure all the bytes have been read in
                if (offset < bytes.length) {
                        throw new IOException("Could not completely read file "+file.getName());
                }

                // Close the input stream and return bytes
                is.close();
                return bytes;
        }
}

You probably need to add this class to your project

您可能需要將此類添加到項目中