便携式函数来创建从原始字节bmp文件？ [英] A portable function to create a bmp file from raw bytes?

问题描述

我有原始字节数组，我要让那些字节的bmp文件。也就是说，我必须填写的位图头和结构法其他的东西，然后写下来字节，所以我必须以正确的格式BMP文件。

I have an array of raw bytes and I want to make a bmp file from those bytes. That is, I have to fill bitmap header structre and other things, then write down the bytes so I have a bmp file in the proper format.

当我需要这个只有一些快速的检查，我不知道是否有这样做的便携式方法 - 以原始字节，并将其保存为bmp文件。我正在写在Unix上的任何Windows版本都不会做的。

As I need this for some quick check only, I wonder if there is a portable method to do this - take raw bytes and save them as a bmp file. Any Windows version won't do as I'm writing that on Unix.

另外，我可以保存这些字节作为任何其他图像格式 - 我只是需要有一个快速浏览拍摄的图像。

Alternatively, I can save those bytes as any other image format - I only need to have a quick look at the resulting picture.

推荐答案

下面会给你一个 .ppm从字节数组形象。在P6指定二进制格式的每像素3个字节，但纯文本，还支持和各种形式的灰度。你应该使用这种情况的原因是，它是容易，因为可以和大多数* nix系统有一堆ppmto的* -tools：ppmtobmp，ppmtojpeg，...，ppmtopng ......你的名字

The following will give you a .ppm image from a byte array. The "P6" specifies binary format 3 byte per pixel, but plain text is also supported and various forms of grayscale. The reason you should use this is that it is easy as can be and most *nix systems have a bunch of ppmto*-tools: ppmtobmp, ppmtojpeg, ..., ppmtopng... you name it.

typedef struct {
    int width;
    int height;
    uint8_t *data;
    size_t size;
} ppm_image;

size_t ppm_save(ppm_image *img, FILE *outfile) {
    size_t n = 0;
    n += fprintf(outfile, "P6\n# THIS IS A COMMENT\n%d %d\n%d\n", 
                 img->width, img->height, 0xFF);
    n += fwrite(img->data, 1, img->width * img->height * 3, outfile);
    return n;
}

有也ppmtocad ......谁又能猜到？

There is also ppmtocad... who would have guessed?

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