{"id":52901,"date":"2025-08-11T21:19:22","date_gmt":"2025-08-11T13:19:22","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/52901.html"},"modified":"2025-08-11T21:19:22","modified_gmt":"2025-08-11T13:19:22","slug":"linux%e5%ad%a6%e4%b9%a0-%e5%ba%94%e7%94%a8%e8%bd%af%e4%bb%b6%e7%bc%96%e7%a8%8b%ef%bc%88fread-fwrite%ef%bc%8c%e6%b5%81%e5%ae%9a%e4%b9%89%e7%9b%b8%e5%85%b3%e6%8e%a5%e5%8f%a3%ef%bc%89","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/52901.html","title":{"rendered":"Linux\u5b66\u4e60-\u5e94\u7528\u8f6f\u4ef6\u7f16\u7a0b\uff08fread\/fwrite\uff0c\u6d41\u5b9a\u4e49\u76f8\u5173\u63a5\u53e3\uff09"},"content":{"rendered":"

fread<\/h4>\n

size_t fread(void *ptr, size_t size, size_t nmemb, FILE *stream); \u00a0<\/p>\n

\u529f\u80fd<\/h6>\n

\u6309\u5757\u4ece\u6587\u4ef6\u8bfb\u53d6\u6570\u636e，\u4ece\u6587\u4ef6\u4e2d\u8bfb nmemb \u00a0\u4e2a\u3001\u6bcf\u4e2a size \u00a0\u5b57\u8282\u7684\u5143\u7d20，\u5b58\u5165 ptr \u00a0\u6307\u5411\u7684\u5185\u5b58\u3002<\/p>\n

\u53c2\u6570<\/h6>\n

–\u00a0 ptr\u00a0：\u5b58\u50a8\u8bfb\u53d6\u6570\u636e\u7684\u5185\u5b58\u9996\u5730\u5740（\u9700\u63d0\u524d\u5206\u914d\u8db3\u591f\u7a7a\u95f4，\u5982\u5b9a\u4e49\u6570\u7ec4\u3001\u7528 \u00a0malloc\u00a0\u00a0\u7533\u8bf7\u5806\u5185\u5b58 ）\u3002
\n– \u00a0size\u00a0：\u5355\u4e2a\u5143\u7d20\u7684\u5b57\u8282\u6570（\u540c \u00a0fwrite\u00a0，\u9700\u548c\u5199\u5165\u65f6\u7684 \u00a0size\u00a0\u00a0\u4e00\u81f4，\u5426\u5219\u6570\u636e\u4f1a\u9519\u4f4d ）\u3002
\n– \u00a0nmemb\u00a0：\u5e0c\u671b\u8bfb\u53d6\u7684\u5143\u7d20\u4e2a\u6570（\u5c1d\u8bd5\u8bfb \u00a0size * nmemb\u00a0\u00a0\u5b57\u8282，\u5b9e\u9645\u8bfb\u591a\u5c11\u770b\u6587\u4ef6\u5185\u5bb9 ）\u3002
\n– \u00a0stream\u00a0：\u6587\u4ef6\u6d41\u6307\u9488（\u901a\u8fc7 \u00a0fopen\u00a0\u00a0\u6253\u5f00，\u9700\u4ee5\u53ef\u8bfb\u6a21\u5f0f\u5982 \u00a0\u00a0"r+"\u00a0\u00a0\u7b49\u6253\u5f00 ）\u3002<\/p>\n

\u8fd4\u56de\u503c<\/h6>\n

– \u6210\u529f：\u8fd4\u56de\u5b9e\u9645\u8bfb\u5230\u7684\u5143\u7d20\u4e2a\u6570（\u7b49\u4e8e \u00a0nmemb\u00a0\u00a0\u8868\u793a\u8bfb\u6ee1；\u82e5\u6587\u4ef6\u672b\u5c3e\u4e0d\u591f \u00a0nmemb\u00a0\u00a0\u4e2a\u5143\u7d20，\u8fd4\u56de\u5b9e\u9645\u8bfb\u5230\u7684\u6570\u91cf ）\u3002
\n– \u6587\u4ef6\u672b\u5c3e：\u8fd4\u56de \u00a00\u00a0（\u53ef\u7528\u6765\u5224\u65ad\u662f\u5426\u8bfb\u5b8c\u6587\u4ef6 ）\u3002<\/p>\n

#include<stdio.h>
\nstruct stu
\n{
\n int id;
\n char name[100];
\n int score;
\n};
\nint main(int argc,const char*argv[])
\n{
\n FILE*fp = fopen(".\/1.txt","r");
\n if(NULL == fp)
\n {
\n printf("fopen error\\\\n");
\n return -1;
\n }
\n struct stu s;
\n struct stu ss[10];
\n size_t cnt = fread(&s,sizeof(struct stu),1,fp);<\/p>\n

printf("cnt = %ld\\\\n",cnt);
\n printf("%d %s %d\\\\n",s.id,s.name,s.score);<\/p>\n

cnt = fread(ss,sizeof(struct stu),10,fp);
\n printf("cnt = %ld\\\\n",cnt);<\/p>\n

for(int i = 0;i < cnt;i++)
\n {
\n printf("%d %s %d\\\\n",ss[i].id,ss[i].name,ss[i].score);
\n }
\n fclose(fp);
\n}<\/p>\n

fwrite<\/h4>\n

size_t fwrite(const void *ptr, size_t size, size_t nmemb, FILE *stream); \u00a0<\/p>\n

\u529f\u80fd<\/h6>\n

\u6309\u5757\u5411\u6587\u4ef6\u5199\u5165\u6570\u636e，\u628a ptr \u00a0\u6307\u5411\u7684\u5185\u5b58\u6570\u636e，\u4ee5\u300c size \u00a0\u5b57\u8282\/\u5143\u7d20 \u3001\u5171 nmemb \u00a0\u4e2a\u5143\u7d20\u300d\u7684\u5f62\u5f0f\u5199\u5165\u6587\u4ef6\u3002<\/p>\n

\u53c2\u6570<\/h6>\n

– \u00a0ptr\u00a0：\u8981\u5199\u5165\u6570\u636e\u7684\u5185\u5b58\u9996\u5730\u5740（\u5e38\u642d\u914d\u6570\u7ec4\u3001\u7ed3\u6784\u4f53\u7b49，\u4f20\u9012 \u00a0&\u53d8\u91cf\u00a0\u00a0\u6216\u6570\u7ec4\u540d）\u3002
\n– \u00a0size\u00a0：\u5355\u4e2a\u5143\u7d20\u7684\u5b57\u8282\u6570（\u5982 \u00a0sizeof(int)\u00a0\u00a0\u8868\u793a int \u7c7b\u578b\u5360 4 \u5b57\u8282）\u3002
\n– \u00a0nmemb\u00a0：\u8981\u5199\u5165\u7684\u5143\u7d20\u4e2a\u6570（\u9700\u548c \u00a0size\u00a0\u00a0\u5339\u914d，\u603b\u5199\u5165\u5b57\u8282 = \u00a0size * nmemb\u00a0\u00a0）\u3002
\n– \u00a0stream\u00a0：\u6587\u4ef6\u6d41\u6307\u9488（\u901a\u8fc7 \u00a0fopen\u00a0\u00a0\u6253\u5f00\u6587\u4ef6\u83b7\u5f97，\u9700\u786e\u4fdd\u4ee5\u53ef\u5199\u6a21\u5f0f\u5982 \u00a0"wb"\u00a0\u00a0\u3001\u00a0"a+"\u00a0\u00a0\u7b49\u6253\u5f00 ）\u3002<\/p>\n

\u8fd4\u56de\u503c<\/h6>\n

– \u6210\u529f：\u8fd4\u56de\u5b9e\u9645\u5199\u5165\u7684\u5143\u7d20\u4e2a\u6570（\u6b63\u5e38\u5e94\u7b49\u4e8e \u00a0nmemb\u00a0；\u82e5\u78c1\u76d8\u6ee1\u3001\u6743\u9650\u4e0d\u8db3\u7b49，\u53ef\u80fd\u5c0f\u4e8e）\u3002<\/p>\n

#include<stdio.h><\/p>\n

struct stu
\n{
\n int id;
\n char name[100];
\n int score;
\n};
\nint main(int argc,const char*argv[])
\n{
\n FILE*fp = fopen(".\/1.txt","w");
\n if(NULL == fp)
\n {
\n printf("fopen error\\\\n");
\n return -1;
\n }
\n struct stu ss[5] = {{1,"zahngsan",99},{2,"lisi",90},{3,"wangwu",98},{4,"maliu",67},{5,"wanger",100}};
\n size_t cnt = fwrite(ss,sizeof(struct stu),5,fp);
\n printf("cnt = %ld\\\\n",cnt);
\n fclose(fp);
\n}<\/p>\n

bmp<\/h4>\n

\"\"<\/h4>\n

#pragma pack(1)<\/p>\n

\/\/bmp\u6587\u4ef6\u76f8\u5173\u4fe1\u606f
\ntypedef struct tagBITMAPFILEHEADER {
\n short bfType; \/\/ \u6587\u4ef6\u7c7b\u578b\u6807\u5fd7
\n int bfSize; \/\/ \u6587\u4ef6\u5927\u5c0f，\u5355\u4f4d\u4e3a\u5b57\u8282
\n short bfReserved1; \/\/ \u4fdd\u7559\u5b57\u8282
\n short bfReserved2; \/\/ \u4fdd\u7559\u5b57\u8282
\n int bfOffBits; \/\/ \u6570\u636e\u504f\u79fb\u91cf，\u5373\u5b9e\u9645\u56fe\u50cf\u6570\u636e\u5f00\u59cb\u7684\u4f4d\u7f6e
\n}Bmp_file_head_t;
\n\/\/bmp\u56fe\u50cf\u4fe1\u606f
\ntypedef struct tagBITMAPINFOHEADER {
\n int biSize; \/\/ BITMAPINFOHEADER\u7684\u5927\u5c0f，\u5355\u4f4d\u4e3a\u5b57\u8282
\n int biWidth; \/\/ \u4f4d\u56fe\u7684\u5bbd\u5ea6，\u5355\u4f4d\u4e3a\u50cf\u7d20
\n int biHeight; \/\/ \u4f4d\u56fe\u7684\u9ad8\u5ea6，\u5355\u4f4d\u4e3a\u50cf\u7d20
\n short biPlanes; \/\/ \u76ee\u6807\u8bbe\u5907\u7684\u4f4d\u5e73\u9762\u6570，\u5fc5\u987b\u4e3a1
\n short biBitCount; \/\/ \u6bcf\u50cf\u7d20\u4f4d\u6570（\u989c\u8272\u6df1\u5ea6）
\n int biCompression; \/\/ \u56fe\u50cf\u538b\u7f29\u7c7b\u578b
\n int biSizeImage; \/\/ \u56fe\u50cf\u5927\u5c0f，\u5355\u4f4d\u4e3a\u5b57\u8282
\n int biXPelsPerMeter;\/\/ \u6c34\u5e73\u5206\u8fa8\u7387，\u5355\u4f4d\u4e3a\u50cf\u7d20\/\u7c73
\n int biYPelsPerMeter;\/\/ \u5782\u76f4\u5206\u8fa8\u7387，\u5355\u4f4d\u4e3a\u50cf\u7d20\/\u7c73
\n int biClrUsed; \/\/ \u5b9e\u9645\u4f7f\u7528\u989c\u8272\u6570
\n int biClrImportant; \/\/ \u91cd\u8981\u989c\u8272\u6570
\n}Bmp_info_t;
\n#pragma pack()<\/p>\n

int get_bmp_head_info(const char *bmpname, Bmp_file_head_t *pheadinfo, Bmp_info_t *pbmpinfo)
\n{
\nFILE *fp = fopen(bmpname, "r");
\nif (NULL == fp)
\n{
\nprintf("fopen error\\\\n");
\nreturn -1;
\n}<\/p>\n

fread(pheadinfo, sizeof(Bmp_file_head_t), 1, fp);
\nfread(pbmpinfo, sizeof(Bmp_info_t), 1, fp);<\/p>\n

fclose(fp);<\/p>\n

return 0;
\n}<\/p>\n

int main(int argc, const char *argv[])
\n{<\/p>\n

Bmp_file_head_t headinfo;
\nBmp_info_t bmpinfo;<\/p>\n

get_bmp_head_info(".\/3.bmp", &headinfo, &bmpinfo);<\/p>\n

printf("sizeof(Bmp_file_head_t) = %ld\\\\n", sizeof(Bmp_file_head_t));
\nprintf("sizeof(Bmp_info_t) = %ld\\\\n", sizeof(Bmp_info_t));
\nprintf("biWidth = %d, biHeight = %d, biBitCount = %d\\\\n", bmpinfo.biWidth, bmpinfo.biHeight, bmpinfo.biBitCount);<\/p>\n

return 0;
\n}<\/p>\n

\u00a0\u6d41\u5b9a\u4f4d\u76f8\u5173\u63a5\u53e3<\/h2>\n

fseek<\/h4>\n

int fseek(FILE *stream, long offset, int whence);<\/p>\n

\u529f\u80fd<\/h6>\n

\u5b9e\u73b0\u6587\u4ef6\u6d41\u7684\u91cd\u65b0\u5b9a\u4f4d，\u7528\u4e8e\u8c03\u6574\u6587\u4ef6\u5185\u90e8\u6307\u9488\u7684\u4f4d\u7f6e，\u51b3\u5b9a\u540e\u7eed\u8bfb\u5199\u64cd\u4f5c\u4ece\u6587\u4ef6\u7684\u54ea\u4e2a\u4f4d\u7f6e\u5f00\u59cb\u3002<\/p>\n

\u53c2\u6570<\/h6>\n

– \u00a0stream\u00a0：\u9700\u8981\u8fdb\u884c\u5b9a\u4f4d\u64cd\u4f5c\u7684\u6587\u4ef6\u6d41\u6307\u9488，\u7531 \u00a0fopen\u00a0\u00a0\u7b49\u51fd\u6570\u6253\u5f00\u6587\u4ef6\u540e\u83b7\u5f97\u3002
\n– \u00a0offset\u00a0：\u504f\u79fb\u91cf，\u7528\u4e8e\u6307\u5b9a\u76f8\u5bf9\u4e8e \u00a0whence\u00a0\u00a0\u4f4d\u7f6e\u79fb\u52a8\u7684\u5b57\u8282\u6570，\u53ef\u6b63（\u5411\u540e\u79fb\u52a8 \u00a0）\u3001\u53ef\u8d1f（\u5411\u524d\u79fb\u52a8 \u00a0，\u4f46\u9700\u6ce8\u610f\u4e0d\u80fd\u8d8a\u754c ）\u3002
\n– \u00a0whence\u00a0：\u5b9a\u4f4d\u7684\u76f8\u5bf9\u57fa\u51c6\u4f4d\u7f6e，\u6709\u4ee5\u4e0b\u5b8f\u5b9a\u4e49\u53ef\u9009：
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0– \u00a0SEEK_SET\u00a0：\u4ee5\u6587\u4ef6\u5f00\u5934\u4e3a\u57fa\u51c6\u8fdb\u884c\u504f\u79fb，\u00a0offset\u00a0\u00a0\u4e3a\u76f8\u5bf9\u4e8e\u6587\u4ef6\u5f00\u5934\u7684\u504f\u79fb\u5b57\u8282\u6570\u3002
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0– \u00a0SEEK_CUR\u00a0：\u4ee5\u6587\u4ef6\u5f53\u524d\u8bfb\u5199\u4f4d\u7f6e\u4e3a\u57fa\u51c6\u8fdb\u884c\u504f\u79fb，\u00a0offset\u00a0\u00a0\u662f\u76f8\u5bf9\u4e8e\u5f53\u524d\u4f4d\u7f6e\u7684\u504f\u79fb\u91cf\u3002
\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0– \u00a0SEEK_END\u00a0：\u4ee5\u6587\u4ef6\u672b\u5c3e\u4e3a\u57fa\u51c6\u8fdb\u884c\u504f\u79fb，\u00a0offset\u00a0\u00a0\u5e38\u642d\u914d\u8d1f\u6570，\u5b9e\u73b0\u4ece\u672b\u5c3e\u5f80\u524d\u5b9a\u4f4d（\u5982 \u00a0fseek(stream, -10, SEEK_END)\u00a0\u00a0\u8868\u793a\u5b9a\u4f4d\u5230\u6587\u4ef6\u672b\u5c3e\u5411\u524d 10 \u5b57\u8282\u5904 ）\u3002<\/p>\n

\u8fd4\u56de\u503c<\/h6>\n

– \u6210\u529f：\u8fd4\u56de \u5f53\u524d\u504f\u79fb\u91cf\u3002
\n– \u5931\u8d25：\u8fd4\u56de -1 ，\u5e38\u89c1\u5931\u8d25\u60c5\u51b5\u5982\u504f\u79fb\u91cf\u5bfc\u81f4\u8d8a\u754c（\u5982 \u00a0SEEK_SET\u00a0\u00a0\u65f6 \u00a0offset\u00a0\u00a0\u4e3a\u8d1f\u6570 ）\u3001\u6587\u4ef6\u6d41\u5f02\u5e38\u7b49\u3002<\/p>\n

rewind（fp） ==>fseek（fp，0，SEEK_SET）<\/p>\n

ftell<\/h4>\n

long ftell(FILE *stream);<\/p>\n

\u529f\u80fd<\/h6>\n

\u83b7\u53d6\u6587\u4ef6\u6d41\u5f53\u524d\u4f4d\u7f6e\u5230\u6587\u4ef6\u5f00\u5934\u7684\u504f\u79fb\u91cf，\u5373\u8fd4\u56de\u5f53\u524d\u6587\u4ef6\u6307\u9488\u8ddd\u79bb\u6587\u4ef6\u8d77\u59cb\u4f4d\u7f6e\u7684\u5b57\u8282\u6570，\u53ef\u7528\u4e8e\u5224\u65ad\u6587\u4ef6\u5927\u5c0f\u3001\u8f85\u52a9 fseek \u00a0\u5b9a\u4f4d\u7b49\u573a\u666f\u3002<\/p>\n

\u8fd4\u56de\u503c<\/h6>\n

\u504f\u79fb\u91cf：byte<\/p>\n

\u7ec3\u4e60<\/h4>\n

#include<stdio.h>
\n#include<stdlib.h>
\nstruct stu
\n{
\n int id;
\n char name[100];
\n int score;
\n};
\nint main(int argc,const char*argv[])
\n{
\n FILE*fp = fopen(".\/1.txt","w+");
\n if(NULL == fp)
\n {
\n printf("fopen error\\\\n");
\n return -1;
\n }
\n struct stu ss[5] = {{1,"zahngsan",99},{2,"lisi",90},{3,"wangwu",98},{4,"maliu",67},{5,"wanger",100}};
\n fwrite(ss,sizeof(struct stu),5,fp);<\/p>\n

fseek(fp,0,SEEK_END);
\n long len = ftell(fp);
\n rewind(fp);<\/p>\n

FILE*fp1 = fopen(".\/2.txt","w");
\n if(NULL == fp1)
\n {
\n printf("fopen error\\\\n");
\n return -1;
\n }
\n \/\/\u7a7a\u6d1e\u6587\u4ef6
\n fseek(fp1,len – 1,SEEK_SET);
\n int ret = fputc('\\\\0',fp1);
\n if(EOF == ret)
\n {
\n printf("\u78c1\u76d8\u7a7a\u95f4\u4e0d\u8db3\\\\n");
\n return -1;
\n }<\/p>\n

fseek(fp1,0,SEEK_SET);
\n char *buff = malloc(len);<\/p>\n

fread(buff,1,len,fp);
\n fwrite(buff,1,len,fp1);<\/p>\n

free(buff);
\n fclose(fp);
\n fclose(fp1);
\n}<\/p>\n

strtok<\/h4>\n

char *strtok(char *str, const char *delim); \u00a0<\/p>\n

\u529f\u80fd<\/h6>\n

\u6309\u5206\u9694\u7b26\u622a\u53d6\u5b57\u7b26\u4e32，\u4ece \u00a0str\u00a0\u00a0\u4e2d\u9010\u4e2a\u63d0\u53d6\u7531 \u00a0delim\u00a0\u00a0\u5206\u9694\u7684\u5b50\u4e32\u3002\u9996\u6b21\u8c03\u7528\u9700\u4f20\u5165\u5f85\u5206\u5272\u7684\u5b8c\u6574\u5b57\u7b26\u4e32 \u00a0str\u00a0，\u540e\u7eed\u8c03\u7528\u4f20\u5165 \u00a0NULL\u00a0\u00a0\u5373\u53ef\u7ee7\u7eed\u5206\u5272\u5269\u4f59\u90e8\u5206（\u5185\u90e8\u4f1a\u7ef4\u62a4\u9759\u6001\u6307\u9488\u8bb0\u5f55\u4f4d\u7f6e ）\u3002<\/p>\n

\u53c2\u6570<\/h6>\n

– \u00a0str\u00a0：
\n– \u9996\u6b21\u8c03\u7528：\u4f20\u5165\u5f85\u5206\u5272\u7684\u539f\u59cb\u5b57\u7b26\u4e32（\u4f1a\u88ab\u51fd\u6570\u4fee\u6539，\u5206\u5272\u540e\u539f\u5b57\u7b26\u4e32\u4f1a\u88ab\u5206\u9694\u7b26\u66ff\u6362\u4e3a \u00a0\\\\0\u00a0\u00a0，\u7528\u4e8e\u6807\u8bb0\u5b50\u4e32\u7ed3\u675f ）\u3002
\n– \u540e\u7eed\u8c03\u7528：\u4f20\u5165 \u00a0NULL\u00a0\u00a0，\u51fd\u6570\u4f1a\u57fa\u4e8e\u5185\u90e8\u9759\u6001\u6307\u9488，\u7ee7\u7eed\u5206\u5272\u5269\u4f59\u672a\u5904\u7406\u7684\u90e8\u5206\u3002
\n– \u00a0delim\u00a0：
\n\u4f20\u5165\u5206\u9694\u7b26\u5b57\u7b26\u4e32（\u5982 \u00a0",-"\u00a0\u00a0\u8868\u793a\u9017\u53f7\u3001\u51cf\u53f7\u90fd\u53ef\u4f5c\u4e3a\u5206\u9694\u7b26 ），\u53ea\u8981\u9047\u5230 \u00a0delim\u00a0\u00a0\u4e2d\u4efb\u610f\u5b57\u7b26，\u5c31\u4f1a\u505c\u6b62\u5f53\u524d\u5b50\u4e32\u622a\u53d6\u3002<\/p>\n

\u8fd4\u56de\u503c<\/h6>\n

– \u6210\u529f：\u8fd4\u56de\u5f53\u524d\u622a\u53d6\u5230\u7684\u5b50\u4e32\u9996\u5730\u5740（\u5982\u5206\u5272 \u00a0"a,b,c"\u00a0\u00a0，\u9996\u6b21\u8fd4\u56de \u00a0"a"\u00a0\u00a0\u7684\u5730\u5740，\u540e\u7eed\u4f9d\u6b21\u8fd4\u56de \u00a0"b"\u00a0\u3001\u00a0"c"\u00a0\u00a0）\u3002
\n– \u5931\u8d25\/\u7ed3\u675f：\u8fd4\u56de \u00a0NULL\u00a0（\u5f53\u6ca1\u6709\u53ef\u5206\u5272\u7684\u5b50\u4e32\u65f6\u89e6\u53d1 ）\u3002<\/p>\n

\u7ec3\u4e60<\/h4>\n

\u5b9e\u73b0\u4e00\u4e2a\u5355\u8bcd\u67e5\u8be2\u8f6f\u4ef6： \u7528\u6237\u4ece\u7ec8\u7aef\u8f93\u5165\u4e00\u4e2a\u5355\u8bcd，\u67e5\u627e\u8be5\u5355\u8bcd\u7684\u610f\u601d\u5e76\u6253\u5370； \u82e5\u7528\u6237\u8f93\u5165".quit",\u5219\u9000\u51fa\u8be5\u8f6f\u4ef6\u3002<\/p>\n

#include<stdio.h>
\n#include <string.h>
\nint main(int argc,const char*argv[])
\n{
\n FILE*fp = fopen(".\/dict.txt","r");
\n if(NULL == fp)
\n {
\n printf("fopen error\\\\n");
\n return -1;
\n }
\n rewind(fp);
\n char s[1024];
\n printf("\u8f93\u5165\u5355\u8bcd\\\\n");
\n scanf("%s",s);
\n char buff[1024] = {0};
\n if(0 == strcmp(".quit",s))
\n {
\n return 0;
\n }<\/p>\n

char *p = fgets(buff,sizeof(buff),fp);<\/p>\n

while(p != NULL)
\n {
\n char *b = strtok(buff," ");
\n if(0 == strcmp(b,s))
\n {
\n b = strtok(NULL,"\\\\r");
\n printf("%s%s\\\\n",s,b);
\n break;
\n }
\n p = fgets(buff,sizeof(buff),fp);
\n }
\n if(p == NULL)
\n {
\n printf("not find\\\\n");
\n return 0;
\n }
\n fclose(fp);<\/p>\n

}<\/p>\n<\/p>\n

\n

\u00a0<\/h6>\n<\/p><\/p>\n","protected":false},"excerpt":{"rendered":"

\u6587\u7ae0\u6d4f\u89c8\u9605\u8bfb3\u6b21\u3002SEEK_END \uff1a\u4ee5\u6587\u4ef6\u672b\u5c3e\u4e3a\u57fa\u51c6\u8fdb\u884c\u504f\u79fb\uff0c offset \u5e38\u642d\u914d\u8d1f\u6570\uff0c\u5b9e\u73b0\u4ece\u672b\u5c3e\u5f80\u524d\u5b9a\u4f4d\uff08\u5982 fseek(stream, -10, SEEK_END) \u8868\u793a\u5b9a\u4f4d\u5230\u6587\u4ef6\u672b\u5c3e\u5411\u524d 10 \u5b57\u8282\u5904 \uff09\u3002- offset \uff1a\u504f\u79fb\u91cf\uff0c\u7528\u4e8e\u6307\u5b9a\u76f8\u5bf9\u4e8e whence \u4f4d\u7f6e\u79fb\u52a8\u7684\u5b57\u8282\u6570\uff0c\u53ef\u6b63\uff08\u5411\u540e\u79fb\u52a8 \uff09\u3001\u53ef\u8d1f\uff08\u5411\u524d\u79fb\u52a8 \uff0c\u4f46\u9700\u6ce8\u610f\u4e0d\u80fd\u8d8a\u754c \uff09\u3002- \u6210\u529f\uff1a\u8fd4\u56de\u5f53\u524d\u622a\u53d6\u5230\u7684\u5b50\u4e32\u9996\u5730\u5740\uff08\u5982\u5206\u5272 "a,b,c" \uff0c\u9996\u6b21\u8fd4\u56de "a" \u7684\u5730\u5740\uff0c\u540e\u7eed\u4f9d\u6b21\u8fd4\u56de "b" \u3001 "c" \uff09\u3002<\/p>\n","protected":false},"author":2,"featured_media":52900,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[371],"topic":[],"class_list":["post-52901","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-server","tag-371"],"yoast_head":"\nLinux\u5b66\u4e60-\u5e94\u7528\u8f6f\u4ef6\u7f16\u7a0b\uff08fread\/fwrite\uff0c\u6d41\u5b9a\u4e49\u76f8\u5173\u63a5\u53e3\uff09 - 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