读取bmp图片代码

最新推荐文章于 2023-02-21 21:25:02 发布

原创最新推荐文章于 2023-02-21 21:25:02 发布 · 1.7k 阅读

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本文通过C语言程序解析位图文件的文件头和信息头，介绍了如何读取位图的基本属性，如宽度、高度和颜色深度等。

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代码如下，需要注意结构体对齐问题，编译环境为gcc。

#include <stdio.h>

struct bitmap_fileheader {
	unsigned short	type;
	unsigned int	size;
	unsigned short	reserved1;
	unsigned short	reserved2;
	unsigned int	off_bits;
} __attribute__ ((packed));

struct bitmap_infoheader {
	unsigned int	size;
	unsigned int	width;
	unsigned int	height;
	unsigned short	planes;
	unsigned short	bit_count;
	unsigned int	compression;
	unsigned int	size_image;
	unsigned int	xpels_per_meter;
	unsigned int	ypels_per_meter;
	unsigned int	clr_used;
	unsigned int	clr_important;
} __attribute__ ((packed));

int main(int argc, char *argv[])
{
	FILE *fp;
	struct bitmap_fileheader fh;
	struct bitmap_infoheader ih;

	if (argc < 2) {
		printf("please select a bitmap file!\n");
		return -1;
	}

	fp = fopen(argv[1], "rb");
	if (fp == NULL) {
		printf("no such bitmap file!\n");
		return -1;
	}

	fread(&fh, 1, sizeof(struct bitmap_fileheader), fp);
	printf("type = %x size = %d off_bits = %d\n",
			fh.type, fh.size, fh.off_bits);

	fread(&ih, 1, sizeof(struct bitmap_infoheader), fp);
	printf("size = %d width = %d height = %d bit_count = %d\n",
			ih.size, ih.width, ih.height, ih.bit_count);

	fclose(fp);

	return 0;
}