烦请高手给我将这段C代码转换成C#? 重分相谢啊!

Question

我在VS中用时,文件流类没有跟踪提示,自己转换总有错误啊,请帮忙啊!
#include<stdio.h>
#include<math.h>
#define BUFFERSIZE 0x100FILE *fp1,*fp2,*fp3,*fp4;
 long int ff (a,b,c,d)
 char a,b,c,d;
{
  long int tt;
 if(a>96) a=a-87;
   else if(a>60) a=a-55;
        else a=a-48;
 if(b>96) b=b-87;
 else   if(b>60) b=b-55;
        else b=b-48;
 if(c>96) c=c-87;
 else   if(c>60)   c=c-55;
        else c=c-48;
 if(d>96) d=d-87;
 else   if(d>60)   d=d-55;
else d=d-48; tt=(long)c*16+(long)d+(long)a*4096+(long)b*256; if(tt<32768)  tt=tt; else tt=tt-65536;
 return (tt);
 }
main(int argc,char*argv[] )
{long timer[20];
int i,kl,kkl,n,vsp;
float vsp1,ps1,bn1,vsp2,ps2,bn2,vsp3,ps3,bn3;
char *dats=".dat";
char buffer[128],f,buff[100],newname[30],newaa[20],time[10];
if(argc!=4)
   { printf("you forgot to enter a filename\n");
       exit(0);
   }if((fp1=fopen("zd8bxxx.ddd","wb+"))==NULL)
   { printf("input file open file\n");
     exit(0);
   }
if((fp2=fopen(argv[2],"ab"))==NULL)
   { printf("output1 file open file\n");
     exit(0);
   }
if((fp3=fopen(argv[3],"ab"))==NULL)
   { printf("output2 file open file\n");
     exit(0);
   }
   save(argv[1],"zd8bxxx.ddd");
fread(&time,sizeof(char),8,fp1);
        for(i=2;i<8;i++)
        newname[i-1]=time[i];
        newname[0]='d';
newname[7]=0;
for(i=0;i<7;i++)
newaa[i]=newname[i+3];
        strcat(newname,dats);
        if((fp4=fopen(newname,"wb"))==NULL)
              { printf("output file open fail\n");
              exit(0);
               }        fread(&timer,sizeof(long int),14,fp1);
   for(i=0;i<24;i++)
   {
fread(&buffer,sizeof(char),48,fp1); vsp=ff(buffer[0],buffer[1],buffer[2],buffer[3]);
        vsp1=(float)vsp/10;
ps1=(float)ff(buffer[4],buffer[5],buffer[6],buffer[7])/100;
bn1=(float)ff(buffer[8],buffer[9],buffer[10],buffer[11])/100;
vsp2=(float)ff(buffer[16],buffer[17],buffer[18],buffer[19])/10;
ps2=(float)ff(buffer[20],buffer[21],buffer[22],buffer[23])/100;
bn2=(float)ff(buffer[24],buffer[25],buffer[26],buffer[27])/100;
vsp3=(float)ff(buffer[32],buffer[33],buffer[34],buffer[35])/10;
ps3=(float)ff(buffer[36],buffer[37],buffer[38],buffer[39])/100;
bn3=(float)ff(buffer[40],buffer[41],buffer[42],buffer[43])/100; fprintf(fp2,"%4s%5d%8.1f%7.2f%7.2f%8.1f%7.2f%7.2f%8.1f%7.2f%7.2f\n"
                         ,newaa,i,vsp1,ps1,bn1,vsp2,ps2,bn2,vsp3,ps3,bn3);
fprintf(fp4,"%4s%5d%8.1f%7.2f%7.2f%8.1f%7.2f%7.2f%8.1f%7.2f%7.2f\n"
                         ,newaa,i,vsp1,ps1,bn1,vsp2,ps2,bn2,vsp3,ps3,bn3);
    }
       fread(&buff,sizeof(char),48,fp1);
       fread(&buff,sizeof(char),48,fp1);
       vsp1=(float)ff(buff[0],buff[1],buff[2],buff[3])/10;
       ps1=(float)ff(buff[4],buff[5],buff[6],buff[7])/100;
       bn1=(float)ff(buff[8],buff[9],buff[10],buff[11])/100;
       vsp2=(float)ff(buff[16],buff[17],buff[18],buff[19])/10;
       ps2=(float)ff(buff[20],buff[21],buff[22],buff[23])/100;
       bn2=(float)ff(buff[24],buff[25],buff[26],buff[27])/100;
       vsp3=(float)ff(buff[32],buff[33],buff[34],buff[35])/10;
       ps3=(float)ff(buff[36],buff[37],buff[38],buff[39])/100;
       bn3=(float)ff(buff[40],buff[41],buff[42],buff[43])/100;       fprintf(fp3,"%6s%8.1f%8.2f%8.2f%8.1f%8.2f%8.2f%8.1f%8.2f%8.2f\n",
                  newaa,vsp1,ps1,bn1,vsp2,ps2,bn2,vsp3,ps3,bn3);
      fclose(fp1);
      fclose(fp2);
      fclose(fp3);
      fclose(fp4);
}