如何从Java中的原始byte []创建一个BMP文件 [英] How to create a BMP file from raw byte[] in Java

问题描述

我有一个C ++应用程序，它与相机通信并获取原始图像数据。
然后我有一个Byte []在C + +，我想发送到Java与JNI。

然而，我需要转换原始Byte [到一个真正的文件格式（.bmp是我的第一选择）。
我可以很容易地做到这一点，如果我写它从C ++到硬盘驱动器上的文件，使用BITMAPFILEINFO和BITMAPHEADERINFO，但我不知道如何将整个格式发送到Java。

然后我想到使用JNI只发送原始的byte []数据，然后将其转换为
.bmp，但我似乎找不到任何好的库在Java中这样做。

我最好的选择是什么？在C ++中转换图像，然后使用JNI发送它或将RAW数据发送到Java，然后将其转换为.bmp？

解决方案

这只是Java 1.5中的两行：

  BufferedImage image = ImageIO.read（new ByteArrayInputStream（byteArray））; 
 ImageIO.write（image，BMP，new File（filename.bmp））; 
  

Java（在Windows上）知道如何导出jpg，png和bmp， / p>

I have a C++ application which communicates with a camera and fetches raw image-data. I then have a Byte[] in C++, which i want to send to Java with JNI.

However, i need to convert the raw Byte[] to an real file format(.bmp was my first choice). I can easily do this if i write it from C++ to an file on the hard-drive, using BITMAPFILEINFO and BITMAPHEADERINFO, but i do not know how one would go about sending the entire-format to Java.

Then i thought about sending only the raw byte[] data using JNI and then converting it to .bmp, but i can't seem to find any good library for doing this in Java.

What would be my best choice? Converting the image in C++ and then sending it using JNI or send the RAW data to Java and then convert it to .bmp? How would i easiest achieve this?

解决方案

It's just two lines in Java 1.5:

BufferedImage image = ImageIO.read( new ByteArrayInputStream( byteArray ) );
ImageIO.write(image, "BMP", new File("filename.bmp"));

Java (on Windows) knows how to export jpg, png and bmp as far as i know.

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