• fseek
  1 //文件路径 2     char path[150] = "1.txt"; 3  4  5     //FILE *pf = fopen(path, "a+");//尾部添加,文件指针在尾部 6     //FILE *pf = fopen(path, "w+");//文件指针在头部，清空内容 7     FILE *pf = fopen(path, "r+");//文件指针在头部，不清空内容 8     fseek(pf, 0, SEEK_END); 9     fputs("0000000", pf);10     fflush(pf);//刷新文件11 12 13     //插入14     int length = 10;15     for (int i = 0; i < 10;i++)16     {17         fseek(pf, -7-i-1, SEEK_END);18         int ch = fgetc(pf);19 //#define SEEK_CUR    1 当前20 //#define SEEK_END    2 结束21 //#define SEEK_SET    0  开头22 23         fseek(pf, -i-1, SEEK_END);24         fputc(ch,pf);25         fflush(pf);//刷新文件26     }27     fseek(pf, -17, SEEK_END);//a+ 文件指针移动无效28                              //r+，文件覆盖29     fputs("abcdefg", pf);30     fflush(pf);//刷新文件31 32     fclose(pf);

   

• 以"rb+"的形式打开文件指针在头部,不清空内容
  1     char path[150] = "1.txt"; 2     FILE *pf = fopen(path, "rb+");//文件指针在头部，不清空内容 3  4     fseek(pf, -20, SEEK_END);//a+ 文件指针移动无效 5     fputc('8', pf); 6     fputs("123545", pf); 7  8     rewind(pf); 9 10     char ch;11     while ((ch=fgetc(pf))!=EOF)12     {13         putchar(ch);14     }15 16     fclose(pf);

   

• 宽字符读取文件
  1 //设定中文 2     setlocale(LC_ALL, "zh-CN"); 3     wchar_t path[150] = L"Z:\\I\\百度内部员工联系方式.txt"; 4     //文件指针在头部，不清空内容 5     FILE *pf = _wfopen(path, L"r"); 6      7     if (pf==NULL) 8     { 9         printf("error");10     }11     wchar_t wstr[1128] = { 0 };12     wchar_t *p = fgetws(wstr, 1128, pf);13     wprintf(L"-%s-\n", wstr);14     p = fgetws(wstr, 1128, pf);15     while (p!=NULL)16     {17         //输出18         wprintf(L"-%s-\n", wstr);19         p = fgetws(wstr, 1128, pf);20     }21 22     fclose(pf);

   

• 常用宽字符文件函数
  1 //fgetc  fgetwc2 //fputc fputwc3 //fgets fgetws4 //fputs fputws5 //fprintf  fwprintf6 //fscanf fwscanf7 8 //fread ,fwrite

   

• fgetwc fputwc putwchar用法示例
  1     setlocale(LC_ALL, "zh-CN"); 2     FILE *pfr = _wfopen(L"QQ-腾讯通讯录.txt", L"rb"); 3     FILE *pfw = _wfopen(L"QQc.txt", L"wb"); 4     while (!feof(pfr)) 5     { 6         wchar_t ch = fgetwc(pfr);//获取宽字符 7         fputwc(ch, pfw); 8         putwchar(ch);//显示宽字符 9 10     }11     fclose(pfr);12     fclose(pfw);

   

• fgetws fputws wprintf用法示例
  1        setlocale(LC_ALL, "zh-CN"); 2     FILE *pfr = _wfopen(L"QQ-腾讯通讯录.txt", L"rb"); 3     FILE *pfw = _wfopen(L"QQ.txt", L"wb"); 4     while (!feof(pfr)) 5     { 6         wchar_t wstr[256] = { 0 }; 7         fgetws(wstr, 256, pfr); 8         wprintf(L"%ls",wstr); 9         fputws(wstr, pfw);//宽字符写入10 11     }12     fclose(pfr);13     fclose(pfw);

   

• fwscanf fwprintf用法示例
  1         setlocale(LC_ALL, "zh-CN");2     wchar_t wstr[100] = { 0 };3     fwscanf(stdin, L"%s", wstr);4     fwprintf(stdout, L"%s%d%s", L"你好", 100,wstr);