用c建个最简单的看图程序该怎么弄啊？

xiaodaoren

麻烦诸位指点一下，利用最基础的fb的调用，能看某一种格式的图像，黑白彩色都可以，该怎么做在下完全没有概念。
例如说要看bmp格式的，应该用到哪些东西？从什么地方开始赋予位值和色值？给完一个点之后该做什么？……

SST中国

首先了解bmp格式.一般是bmp头加rgb色彩空间,fb本身就支持rgb的显示.所以很简单.

houtinghua

struct bmptou {     char type[2];     unsigned long size;     unsigned long baoliu;//都是0     unsigned long offset;//数据的偏移值     unsigned long bmpheadsize;//但前图片的头大小     unsigned long bmpwidth;     unsigned long bmpheigth;     short int planes;//该制总是1 位图的位面数     short int bitcount;//像素的为数     unsigned long compression;//压缩说明     unsigned long bmpdatasize;//数据大小 数据以4位对其     unsigned long hr;//用像素／米别是的水平分辨率     unsigned long vr;//垂直     unsigned long color;//位图的颜色书     unsigned long impcolor;      } objbmp; int main() {     FILE *bmpfp=NULL;     if((bmpfp=fopen("image.bmp","rb"))==NULL){             printf("Read the bmp file has failed\n");             exit(1);             } //开始解析     headread(bmpfp);     pixread(bmpfp);     newbmp();                          fclose(bmpfp);     return 0; }        void  headread(FILE *fpin)                               //read the bmp file head 1078 byte {     int num1;           num1 = fread( objbmp.type,1,2,fpin ); printf( "%s\n",objbmp.type );     num1 = fread( &objbmp.size,sizeof( unsigned long ),1,fpin ); printf( "%lu\n",objbmp.size );     num1 = fread( &objbmp.baoliu,sizeof( unsigned long ),1,fpin );     num1 = fread( &objbmp.offset,sizeof( unsigned long ),1,fpin ); printf( "%lu\n",objbmp.offset );     num1 = fread( &objbmp.bmpheadsize,sizeof( unsigned long ),1,fpin ); printf( "%lu\n",objbmp.bmpheadsize );     num1 = fread( &objbmp.bmpwidth,sizeof( unsigned long ),1,fpin ); printf( "width %lu\n",objbmp.bmpwidth );     num1= fread( &objbmp.bmpheigth,sizeof( unsigned long ),1,fpin ); printf( "heigth %lu\n",objbmp.bmpheigth );     num1 = fread( &objbmp.planes,sizeof( short int ),1,fpin ); printf( "ceng %d\n",objbmp.planes );     num1  = fread( &objbmp.bitcount,sizeof( short int ),1,fpin ); printf( "bit count %d\n",objbmp.bitcount );     num1 = fread( &objbmp.compression,sizeof( unsigned long ),1,fpin ); printf( "ya suo lei xing %lu\n",objbmp.compression );     num1 = fread( &objbmp.bmpdatasize,sizeof( unsigned long ),1,fpin ); printf( "ya suo tuxiang size %lu\n",objbmp.bmpdatasize );     num1 = fread( &objbmp.hr,sizeof( unsigned long ),1,fpin ); printf( "shuipingxiangsu %lu\n",objbmp.hr );     num1 = fread( &objbmp.vr,sizeof( unsigned long ),1,fpin ); printf( "chuizhixiangxu %lu\n",objbmp.vr );     num1 = fread( &objbmp.color,sizeof( unsigned long ),1,fpin ); printf( "color %lu\n",objbmp.color );     num1 = fread( &objbmp.impcolor,sizeof( unsigned long ),1,fpin ); printf( "impcolor %lu\n",objbmp.impcolor );     int a=0,b=0,c=0,d=0; while(1) {     num1 = fread( &a,sizeof( char ),1,fpin );         num1 = fread( &b,sizeof( char ),1,fpin );     num1 = fread( &c,sizeof( char ),1,fpin );     num1 = fread( &d,sizeof( char ),1,fpin ); printf( "%d,%d,%d,%d\n",a,b,c,d ); } }

但是到了真正要读取数据的地方  输出就不对了 我的图片的第一个像素是纯白色  rgb 255.255.255 第4个字节对其应该为0  但是我读出来的第4个为255 我翻阅了bmp文件格式  一讲到数据段就没了。。。。谁能补充一下 不生感激

leftatrium

用GD库比较简单一些吧。干嘛要自己解析文件格式？

houtinghua

请问那里有GD库
我是新手 烦劳相告

haplo

在framebuffer下看图的话，用SDL来开发比较简单，显示bmp的库有现成的。