fgetc 统计行号
23 FILE* fp=fopen("./1.c","r");
24 if(fp==0)
25 {
26 perror("错误原因");
27 return -1;
28 }
29 int count=0;
30 while(1)
31 {
32 char retval=fgetc(fp);
33 if(retval==EOF)
34 {
35 break;
36 }
37 else if(retval=='\n')
38 {
39 count++;
40 }
41 }
42 printf("count=%d\n",count);
43 fclose(fp);
44
45 return 0;
46 } fgetc/fputc 文件拷贝
23 FILE* rfp=fopen("./1.c","r");
24 FILE* wfp=fopen("./11.c","w");
25 if(rfp==0||wfp==0)
26 {
27 perror("错误原因");
28 return -1;
29 }
30 while(1)
31 {
32 char ch=fgetc(rfp);
33 if(ch==EOF)
34 {
35 break;
36 }
37 fputc(ch,wfp);
38 }
39 fclose(rfp);
40 fclose(wfp);
41 return 0;
42 }
fscanf/fprintf 文件拷贝
21 int main(int argc, const char *argv[])
22 {
23 FILE* rfp=fopen("11.c","r");
24 FILE* wfp=fopen("111.c","w");
25 if(rfp==0||wfp==0)
26 {
27 perror("错误原因");
28 return -1;
29 }
30 while(1)
31 {
32 char ch=0;
33 int retval=fscanf(rfp,"%c",&ch);
34 if(retval==EOF)
35 {
36 break;
37 }
38 fprintf(wfp,"%c",ch);
39 }
fgets读的过程
23 FILE* fp=fopen("./1.c","r");
24 if(fp==0)
25 {
26 perror("错误原因");
27 return -1;
28 }
29 char str[10]="";
30 while(1)
31 {
32 char* p=fgets(str,10,fp);
33 if(p==NULL)
34 {
35 break;
36 }
37 printf("%s\n",str);
38 }
39 // printf("%s\n",str);
40 fclose(fp);
41 return 0;
42 }
fgets统计行号
24 FILE* fp=fopen("./1.c","r");
25 if(fp==0)
26 {
27 perror("错误原因");
28 return -1;
29 }
30 int count=0;
31 char str[2]="";
32 while(1)
33 {
34 char* p=fgets(str,2,fp);
35 if(p==NULL)
36 {
37 break;
38 }
39 else if(str[0]=='\n')
40 {
41 count++;
42 }
43 }
44 printf("count=%d\n",count);
45 return 0;
46 } fread/fwrite/fseek 红色旗
23 FILE* fp=fopen("./SYK6XNF[HINYIE}OP)_6I96.bmp","r");
24 int size=0;
25 int width=0;
26 int height=0;
27 fseek(fp,2,SEEK_SET);
28 fread(&size,4,1,fp);
29 printf("图片总大小为：%d\n",size);
30
31 fseek(fp,18,SEEK_SET);
32 fread(&width,4,1,fp);
33 fread(&height,4,1,fp);
34 printf("width=%d,height=%d\n",width,height);
35
36 unsigned char bgr[3]={0,0,255};
37 fp=fopen("./SYK6XNF[HINYIE}OP)_6I96.bmp","r+");
38 fseek(fp,54,SEEK_SET);
39 for(int i=0;i<width;i++)
40 {
41 for(int j=0;j<height;j++)
42 {
43 fwrite(bgr,3,1,fp);
44 }
45 }
46 fclose(fp);