复制文件
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1 //任意文件复制demo 2 3 #define _CRT_SECURE_NO_WARNINGS 4 #include<stdio.h> 5 #include<stdlib.h> 6 #include<string.h> 7 #include<time.h> 8 9 void input_file() 10 { 11 char buf[4096] = { 0 }; 12 FILE* fp1 = fopen("test.mp4", "rb");//fp1用来读文件数据 13 FILE* fp2 = fopen("test_cp.mp4", "wb");//fp2用来写文件数据 14 while (1) 15 { 16 int ret; 17 ret = fread(buf, 1,sizeof(buf), fp1); 18 if (ret == 0) 19 { 20 break; 21 } 22 fwrite(buf, 1, ret, fp2); 23 } 24 fclose(fp1); 25 fclose(fp2); 26 27 } 28 29 int main() 30 { 31 input_file(); 32 return 0; 33 }
随机数文件排序
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1 //随机数文件排序 2 3 #define _CRT_SECURE_NO_WARNINGS 4 #include<stdio.h> 5 #include<stdlib.h> 6 #include<string.h> 7 #include<time.h> 8 9 int a[10]; 10 void printf_file() 11 { 12 FILE* fp = fopen("test.txt", "w"); 13 if (!fp) 14 { 15 perror("OPEN FILE:\n"); 16 } 17 srand(time(NULL)); 18 for (size_t i = 0; i < 10; i++) 19 { 20 fprintf(fp,"%d\n",rand() % 100); 21 } 22 23 24 fclose(fp); 25 } 26 void read_file_fscanf() 27 { 28 FILE* fp = fopen("test.txt", "r"); 29 if (!fp) 30 { 31 perror("OPEN FILE:"); 32 } 33 int temp =0; 34 int k = 0; 35 while (1) 36 { 37 if (feof(fp)) 38 { 39 break; 40 } 41 fscanf(fp, "%d\n", &temp); 42 printf("num = %d\n", temp); 43 a[k] = temp; 44 k++; 45 46 } 47 fclose(fp); 48 } 49 void Paixu_File() 50 { 51 read_file_fscanf(); 52 FILE* fp = fopen("dst.txt", "w"); 53 if (!fp) 54 { 55 perror("NEW file create default:"); 56 } 57 int temp; 58 for (int i = 0; i < 9; i++) 59 { 60 for (int j = i + 1; j < 10; j++) 61 { 62 if (a[i] > a[j]) 63 { 64 temp = a[i]; 65 a[i] = a[j]; 66 a[j] = temp; 67 } 68 69 } 70 } 71 for (int i = 0; i < 10; i++) 72 { 73 fprintf(fp, "%d\n", a[i]); 74 } 75 76 77 fclose(fp); 78 79 } 80 int main() 81 { 82 printf_file(); //给文件输入随机数 83 Paixu_File(); 84 return 0; 85 }
任意读写文件
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1 //任意读写文件 2 3 #define _CRT_SECURE_NO_WARNINGS 4 #include<stdio.h> 5 #include<stdlib.h> 6 #include<string.h> 7 #include<time.h> 8 typedef struct student { 9 int age; 10 char name[10]; 11 int num; 12 }stu_t; 13 stu_t stu[4] = { 14 18,"hehe",20, 15 19,"FUCK",30, 16 20,"OOOO",40, 17 21,"NONO",50 18 }; 19 20 void Input_file() 21 { 22 FILE* fp = fopen("test.txt", "rb+"); 23 if (!fp) 24 { 25 perror("OPEN FILE:"); 26 return; 27 } 28 stu_t test1; 29 fwrite(stu, 1,4*sizeof(stu_t), fp);//往里面以二进制写入4个结构体 30 fseek(fp, sizeof(stu_t), SEEK_SET);//光标移到第一个结构体的后面一个 31 fread(&test1, 1, sizeof(test1), fp); 32 printf("The Second age = %d,name = %s,num = %d\n", test1.age, test1.name, test1.num); 33 int lenth = ftell(fp); 34 printf("当前到文件起始位置的字节数为%d\n", lenth); 35 rewind(fp);//将文件光标移到最初始 36 //获取文件大小 37 fseek(fp, 0, SEEK_END);//将文件光标移到末尾 38 lenth = ftell(fp);//获取从当前文件光标到最初始的字节数 39 printf("文件总大小为%d\n", lenth); 40 fclose(fp); 41 } 42 43 void main() 44 { 45 46 Input_file(); 47 }
不用打开文件获取文件信息
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1 //不用打开文件获取文件属性 2 #define _CRT_SECURE_NO_WARNINGS 3 #include<stdio.h> 4 #include<stdlib.h> 5 #include<string.h> 6 #include<time.h> 7 #include<sys/types.h> 8 #include<sys/stat.h> 9 10 11 12 void main() 13 { 14 struct stat buf; 15 int ret = stat("test.txt", &buf);//传输参数,在函数调用结束时,充当函数返回值 16 printf("文件大小 :%d\n", buf.st_size); 17 }