字节[]到图像，奇怪的字节[] [英] Byte[] to an image, strange byte[]
问题描述
我有一个通过tcp发送给我的位图图像，然后将数据存储在一个名为jacketBytes的byte []数组中，但是当我尝试使用它制作图像时，该图像就会出现；
BufferedImage img = ImageIO.read(新ByteArrayInputStream(bytes));
我得到Nullpointerexception
因此我开始以各种方式写出字节数组来进行故障排除.
Hi, i am having a bitmap image sent to me over tcp, then stores the data in a byte[] array called jacketBytes, but thenen when i try to make an image out of it using;
BufferedImage img = ImageIO.read(new ByteArrayInputStream(bytes));
i get Nullpointerexception
so i started troubleshooting by writing out my byte array in different ways.
FileOutputStream fos = new FileOutputStream(strFilePath);
System.out.println("total bytes: "+bytes.length);
for(int i =0; i < 56; i++){
System.out.print("0x"+bytes[i]+" ");
}
System.out.println();
for(int i =0; i < 1000; i++){
System.out.print((char)bytes[i]);
}
System.out.println();
bytes.toString();
System.out.println(bytes.toString());
fos.write(bytes);
fos.close();
我从中得到的输出是:
the output i get from that is :
total bytes: 34928
0x52 0x50 0x52 0x68 0x51 0x54 0x48 0x52 0x48 0x49 0x48 0x48 0x48 0x48 0x48 0x48 0x48 0x48 0x48 0x48
424D3604010000000000
第一部分42 4D(0x52 0x50 0x52 0x68)是ASCII的BM，就像bmp标头应该开始的方式一样.
我无法弄清楚的是，如果有数据，剩下的就是什么！应该有4个字节，其中包含以字节为单位的图像数据.
至少根据维基百科维基百科
关于如何将数据发送给我的唯一文档是:
NET/USB夹克艺术品/专辑数据
-图像类型0:BMP，1:JPEG
-封包标记0:开始，1:下一个，2:结束
xxxxxxxxxxxxxx->夹克/唱片艺术数据(有效长度，最大1024个ASCII十六进制字母)
我设法将其存储在单字节数组中，但由于包含太多的空值，我不知道如何将其放入图像数据中！
the first part 42 4D(0x52 0x50 0x52 0x68) is BM in ASCII just the way a bmp header is supposed to start.
what i cant figure out is what the rest if the data is! there is supposed to be 4 bytes containing the image data in bytes.
at least according to wikipedia wikipedia
The only documentation on how the data is sent to me is this:
NET/USB Jacket Art/Album Art Data
t-> Image type 0:BMP,1:JPEG
p-> Packet flag 0:Start, 1:Next, 2:End
xxxxxxxxxxxxxx -> Jacket/Album Art Data (valiable length, 1024 ASCII HEX letters max)
i manage to store it in a single byte Array but i do not know how to make it in to image data since it contains so much nulls!
Help appreciated!
推荐答案
您应该将数据编码为base64.
.a框架中的 Base64? [ ^ ]
并具有用于此类传输的正确标题.
You should probably encode your data in base 64.
Base64 in .Net framework?[^]
and have the proper header for such transfer.
我自己解决了该问题，尽管感谢您的回答.当我解决它时，我感到非常沮丧.我得到的字符串是ASCII中的十六进制字符串，所以首先我必须成对地取成对的字符串，然后将成对的字符串变成一个字符.然后我可以使用新的字符串并将其编码回一个byteArray，然后它是一个工作映像.我认为是奇怪的协议.
I Solved it myself, thanks for the answer though. I got so frustrated when i solved it. the string i got was a hex string in ASCII so first i had to take the String pair by pair and then turn the pair i got into a Character. then i could use the new string and just encode it back to a byteArray and then it was a working image. Strange protocol i think.
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