最近在研究图像显示这块，想在/dev/graphics/fb0上显示图像，在研究时需要一个图片的十六进制数值，找了好久，找了一个软件可以实现该功能。
Img2Lcd.exe 这个软件可以实现，一张图片转换后的结果如下：
const unsigned char gImage_1233[128640] = { /* 0X00,0X20,0XF0,0X00,0X86,0X00,0X00,0XE4, */ 0X5D,0X31,0X12,0X00,0X5D,0X31,0X12,0X00,0X5D,0X31,0X12,0X00,0X5D,0X31,0X0F,0X00, 0X5E,0X31,0X10,0X00,0X5D,0X2E,0X12,0X00,0X5D,0X2F,0X11,0X00,0X5E,0X31,0X0F,0X00, 0X62,0X33,0X14,0X00,0X64,0X36,0X16,0X00,0X67,0X39,0X17,0X00,0XA3,0X42,0X02,0X00, 0XA4,0X42,0X02,0X00,0XA4,0X42,0X02,0X00,0XA4,0X41,0X03,0X00,0XA7,0X42,0X03,0X00, 0XA3,0X42,0X06,0X00,0XA5,0X44,0X02,0X00,0XAB,0X41,0X04,0X00,0XA7,0X44,0X03,0X00, 。。。。}；
看到了吗？是char类型的，可是我要的是int类型的，可惜这个软件没有这个功能，如何是好呢。于是自己写了个简单的文件操作代码，在这个转换基础之上转换在做处理，代码如下：
1 /************************************************************************* 2 > File Name: main.c 3 > Author: winfu 4 > Mail: wenfuandyou@163.com 5 > Created Time: Thu 07 Jul 2016 10:08:36 AM CST 6 ************************************************************************/ 7 #include<stdio.h> 8 #include<string.h> 9 #include <sys/types.h> 10 #include <sys/stat.h> 11 #include <fcntl.h> 12 13 int main() 14 { 15 int fd1 = open("./file.txt",O_RDWR); 16 int fd2 = open("./file_bak.txt",O_CREAT|O_WRONLY,0666); 17 int num; 18 if(fd1 < 0 || fd2 < 0) 19 { 20 perror("open"); 21 return -1; 22 } 23 ssize_t res = 1; 24 char buf4[4] = {0}; 25 char buf2[2] = {0}; 26 int i = 0; 27 char c = ','; 28 char cn = ' '; 29 printf("------------ "); 30 do{ 31 i++; 32 res = read(fd1,buf4,sizeof(buf4)); 33 printf("%s",buf4); 34 write(fd2,buf4,sizeof(buf4)); 35 36 lseek(fd1, 3,SEEK_CUR); 37 res = read(fd1,buf2,sizeof(buf2)); 38 printf("%s",buf2); 39 write(fd2,buf2,sizeof(buf2)); 40 41 lseek(fd1, 3,SEEK_CUR); 42 res = read(fd1,buf2,sizeof(buf2)); 43 printf("%s",buf2); 44 write(fd2,buf2,sizeof(buf2)); 45 46 lseek(fd1, 3,SEEK_CUR); 47 res = read(fd1,buf2,sizeof(buf2)); 48 printf("%s ",buf2); 49 write(fd2,buf2,sizeof(buf2)); 50 write(fd2,&c,1); 51 lseek(fd1, 1,SEEK_CUR); 52 num++; 53 if(i==4) 54 { 55 i = 0; 56 printf(" "); 57 write(fd2,&cn,1); 58 lseek(fd1, 1,SEEK_CUR); 59 } 60 }while(res); 61 printf("------------ "); 62 printf("num = %d ",num); 63 close(fd1); 64 close(fd2); 65 return 0; 66 }
将转Img2Lcd.exe转换好的文件去掉头尾 存放到file.txt文档中，将file文档放在该程序的路径下，最后生成file_bak.txt，该文件存放的是转换后的数据：
0X5D311200,0X5D311200,0X5D311200,0X5D310F00, 0X5E311000,0X5D2E1200,0X5D2F1100,0X5E310F00, 0X62331400,0X64361600,0X67391700,0XA3420200, 0XA4420200,0XA4420200,0XA4410300,0XA7420300, 0XA3420600,0XA5440200,0XAB410400,0XA7440300, 0XA9440300,0XAC420500,0XA9440300,0XA8440300, 0XA9450400,0XA3460400,0XAC460500,0XA9450900 ….
这个数据正好是我想要的4字节。