【发布时间】：2014-02-17 04:13:55
【问题描述】：
我想将 .img 文件（512 字节标题，512x512 像素，每像素 8 位（值：0-255））转换为 .ras 文件。 为此，我在本文末尾获得了 C 代码。 我的测试图像 (test.img) 的输出应该是黑白图像 - 所以只包含 0 或 255 的值。 但问题是，当我在 Windows 中编译 C 代码（从底部）时，我生成的 .ras 文件是白色和亮蓝色？！奇怪的是。当我在 Linux 中编译 C 代码时，结果是完美的黑/白？！这怎么会来？ 在这两个系统中，我都使用了 64 位。
所以你可以试试： 1.编译C代码： gcc -lm img2ras.c -o img2ras 2.通过控制台将.img转换为.ras：img2ras test.img test.ras 3. 在 gimp、XnView 或 PaintshopPro 中观看 .ras 文件
您知道这种尴尬的结果是如何在具有相同 gcc 4.8.1 版本的不同操作系统上发生的吗？
test.img: http://www.file-upload.net/download-8629102/test.img.html
img2ras.c
/* this program accepts an input file (which comes from the image
capturing board) and an output file, which must be specified on the command
line. The output file is a Sun rasterfile.
usage : img2ras capfilename rastfilename
This program was written by Chuck Horne and butchered by Mark Holcomb*/
#include <stdio.h>
#include <fcntl.h>
#include <errno.h>
#include <stdlib.h>
main(argc,argv)
int argc;
char *argv[];
{
/**********declarations**********/
int fd_in,fd_out;
/* long int buf[8]; this is for the integers in the header*/
static char buf[] = {
0x59, 0xa6, 0x6a, 0x95, 0x0, 0x0, 0x2, 0x0, 0x0,
0x0, 0x2, 0x0, 0x0, 0x0, 0x0, 0x8, 0x0, 0x4, 0x0,
0x0, 0x0, 0x0, 0x0, 0x1, 0x0, 0x0, 0x0, 0x1, 0x0,
0x0, 0x3, 0x0, 0x0, 0x1, 0x2, 0x3, 0x4, 0x5, 0x6,
0x7, 0x8, 0x9, 0xa, 0xb, 0xc, 0xd, 0xe, 0xf, 0x10,
0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18, 0x19, 0x1a,
0x1b, 0x1c, 0x1d, 0x1e, 0x1f, 0x20, 0x21, 0x22, 0x23, 0x24,
0x25, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e,
0x2f, 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36, 0x37, 0x38,
0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, 0x40, 0x41, 0x42,
0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, 0x4a, 0x4b, 0x4c,
0x4d, 0x4e, 0x4f, 0x50, 0x51, 0x52, 0x53, 0x54, 0x55, 0x56,
0x57, 0x58, 0x59, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e, 0x5f, 0x60,
0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6a,
0x6b, 0x6c, 0x6d, 0x6e, 0x6f, 0x70, 0x71, 0x72, 0x73, 0x74,
0x75, 0x76, 0x77, 0x78, 0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e,
0x7f, 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86, 0x87, 0x88,
0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, 0x90, 0x91, 0x92,
0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9a, 0x9b, 0x9c,
0x9d, 0x9e, 0x9f, 0xa0, 0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6,
0xa7, 0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae, 0xaf, 0xb0,
0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba,
0xbb, 0xbc, 0xbd, 0xbe, 0xbf, 0xc0, 0xc0, 0xc2, 0xc2, 0xc4,
0xc5, 0xc6, 0xc7, 0xc8, 0xc8, 0xca, 0xcb, 0xcc, 0xcd, 0xce,
0xcf, 0xd0, 0xd1, 0xd2, 0xd2, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8,
0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf, 0xe0, 0xe1, 0xe2,
0xe3, 0xe3, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea, 0xeb, 0xeb,
0xed, 0xee, 0xef, 0xf0, 0xf1, 0xf2, 0xf3, 0xf3, 0xf5, 0xf5,
0xf7, 0xf8, 0xf9, 0xfa, 0xfb, 0xfb, 0xfd, 0xfd, 0xff, 0x0,
0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7, 0x8, 0x9, 0xa,
0xb, 0xc, 0xd, 0xe, 0xf, 0x10, 0x11, 0x12, 0x13, 0x14,
0x15, 0x16, 0x17, 0x18, 0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e,
0x1f, 0x20, 0x21, 0x22, 0x23, 0x24, 0x25, 0x26, 0x27, 0x28,
0x29, 0x2a, 0x2b, 0x2c, 0x2d, 0x2e, 0x2f, 0x30, 0x31, 0x32,
0x33, 0x34, 0x35, 0x36, 0x37, 0x38, 0x39, 0x3a, 0x3b, 0x3c,
0x3d, 0x3e, 0x3f, 0x40, 0x41, 0x42, 0x43, 0x44, 0x45, 0x46,
0x47, 0x48, 0x49, 0x4a, 0x4b, 0x4c, 0x4d, 0x4e, 0x4f, 0x50,
0x51, 0x52, 0x53, 0x54, 0x55, 0x56, 0x57, 0x58, 0x59, 0x5a,
0x5b, 0x5c, 0x5d, 0x5e, 0x5f, 0x60, 0x61, 0x62, 0x63, 0x64,
0x65, 0x66, 0x67, 0x68, 0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e,
0x6f, 0x70, 0x71, 0x72, 0x73, 0x74, 0x75, 0x76, 0x77, 0x78,
0x79, 0x7a, 0x7b, 0x7c, 0x7d, 0x7e, 0x7f, 0x80, 0x81, 0x82,
0x83, 0x84, 0x85, 0x86, 0x87, 0x88, 0x89, 0x8a, 0x8b, 0x8c,
0x8d, 0x8e, 0x8f, 0x90, 0x91, 0x92, 0x93, 0x94, 0x95, 0x96,
0x97, 0x98, 0x99, 0x9a, 0x9b, 0x9c, 0x9d, 0x9e, 0x9f, 0xa0,
0xa1, 0xa2, 0xa3, 0xa4, 0xa5, 0xa6, 0xa7, 0xa8, 0xa9, 0xaa,
0xab, 0xac, 0xad, 0xae, 0xaf, 0xb0, 0xb1, 0xb2, 0xb3, 0xb4,
0xb5, 0xb6, 0xb7, 0xb8, 0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe,
0xbf, 0xc0, 0xc0, 0xc2, 0xc2, 0xc4, 0xc5, 0xc6, 0xc7, 0xc8,
0xc8, 0xca, 0xcb, 0xcc, 0xcd, 0xce, 0xcf, 0xd0, 0xd1, 0xd2,
0xd2, 0xd4, 0xd5, 0xd6, 0xd7, 0xd8, 0xd9, 0xda, 0xdb, 0xdc,
0xdd, 0xde, 0xdf, 0xe0, 0xe1, 0xe2, 0xe3, 0xe3, 0xe5, 0xe6,
0xe7, 0xe8, 0xe9, 0xea, 0xeb, 0xeb, 0xed, 0xee, 0xef, 0xf0,
0xf1, 0xf2, 0xf3, 0xf3, 0xf5, 0xf5, 0xf7, 0xf8, 0xf9, 0xfa,
0xfb, 0xfb, 0xfd, 0xfd, 0xff, 0x0, 0x1, 0x2, 0x3, 0x4,
0x5, 0x6, 0x7, 0x8, 0x9, 0xa, 0xb, 0xc, 0xd, 0xe,
0xf, 0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17, 0x18,
0x19, 0x1a, 0x1b, 0x1c, 0x1d, 0x1e, 0x1f, 0x20, 0x21, 0x22,
0x23, 0x24, 0x25, 0x26, 0x27, 0x28, 0x29, 0x2a, 0x2b, 0x2c,
0x2d, 0x2e, 0x2f, 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 0x36,
0x37, 0x38, 0x39, 0x3a, 0x3b, 0x3c, 0x3d, 0x3e, 0x3f, 0x40,
0x41, 0x42, 0x43, 0x44, 0x45, 0x46, 0x47, 0x48, 0x49, 0x4a,
0x4b, 0x4c, 0x4d, 0x4e, 0x4f, 0x50, 0x51, 0x52, 0x53, 0x54,
0x55, 0x56, 0x57, 0x58, 0x59, 0x5a, 0x5b, 0x5c, 0x5d, 0x5e,
0x5f, 0x60, 0x61, 0x62, 0x63, 0x64, 0x65, 0x66, 0x67, 0x68,
0x69, 0x6a, 0x6b, 0x6c, 0x6d, 0x6e, 0x6f, 0x70, 0x71, 0x72,
0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7a, 0x7b, 0x7c,
0x7d, 0x7e, 0x7f, 0x80, 0x81, 0x82, 0x83, 0x84, 0x85, 0x86,
0x87, 0x88, 0x89, 0x8a, 0x8b, 0x8c, 0x8d, 0x8e, 0x8f, 0x90,
0x91, 0x92, 0x93, 0x94, 0x95, 0x96, 0x97, 0x98, 0x99, 0x9a,
0x9b, 0x9c, 0x9d, 0x9e, 0x9f, 0xa0, 0xa1, 0xa2, 0xa3, 0xa4,
0xa5, 0xa6, 0xa7, 0xa8, 0xa9, 0xaa, 0xab, 0xac, 0xad, 0xae,
0xaf, 0xb0, 0xb1, 0xb2, 0xb3, 0xb4, 0xb5, 0xb6, 0xb7, 0xb8,
0xb9, 0xba, 0xbb, 0xbc, 0xbd, 0xbe, 0xbf, 0xc0, 0xc0, 0xc2,
0xc2, 0xc4, 0xc5, 0xc6, 0xc7, 0xc8, 0xc8, 0xca, 0xcb, 0xcc,
0xcd, 0xce, 0xcf, 0xd0, 0xd1, 0xd2, 0xd2, 0xd4, 0xd5, 0xd6,
0xd7, 0xd8, 0xd9, 0xda, 0xdb, 0xdc, 0xdd, 0xde, 0xdf, 0xe0,
0xe1, 0xe2, 0xe3, 0xe3, 0xe5, 0xe6, 0xe7, 0xe8, 0xe9, 0xea,
0xeb, 0xeb, 0xed, 0xee, 0xef, 0xf0, 0xf1, 0xf2, 0xf3, 0xf3,
0xf5, 0xf5, 0xf7, 0xf8, 0xf9, 0xfa, 0xfb, 0xfb, 0xfd, 0xfd,
0xff
};
char pixels[1024]; /*this is for the 8-bit pixels*/
unsigned int ct;
char infile[36];
char outfile[38];
char *T_pixels; /*rotate through 2 rows of input*/
int even=1;
int dummy;
/*first, set up the file i/o*/
strcpy(infile,argv[1]);
strcpy(outfile,argv[2]);
if ((fd_in=open(infile,0))<2) {
printf("can't open %s\n",infile);
exit(1);
}
if ((fd_out=open(outfile,O_WRONLY|O_CREAT,0600))<2) {
printf("can't open %s\n",outfile);
exit(1);
}
/*now insert the raster header (a color raster with lut of 1,1,1:2,2,2:etc) */
/* now write this stuff out */
if (write(fd_out,(char *)buf,800)!=800) {
printf("can't write out the header\n");
exit(1);
}
/*have to throw out the first 512 in img*/
if (read(fd_in,pixels,512)<0) {
printf("can't read the header of %s\n",infile);
exit(1);
}
/* now start slapping the pixels in behind it */
for (ct=0;ct<512;ct++) {
if (even) T_pixels=pixels;
else T_pixels=(char *)(&pixels[512]);
even=!even;
if (read(fd_in,T_pixels,512)<0) {
printf("can't read in pixels, line %d\n",ct);
exit(1);
}
if ((dummy=write(fd_out,T_pixels,512))<0) {
printf("file descriptor is %d ",fd_out);
printf("error number is %d\n",errno);
printf("can't write out pixels, line %d\n",ct);
printf("dummy value is %d\n",dummy);
exit(1);
}
}
/*now close the files and tidy up*/
close(fd_in);
close(fd_out);
} /* ends main */
【问题讨论】：
标签： c linux windows image compiler-construction