[問題] 一個讀寫檔案的問題..

看板C_and_CPP (C/C++)作者sicao (adios)時間15年前 (2011/03/11 14:48)推噓0(0推 0噓 3→)

留言3則, 2人參與討論串1/1

開發平台(Platform): (Ex: VC++, GCC, Linux, ...) linux 額外使用到的函數庫(Library Used): (Ex: OpenGL, ...) no 問題(Question)：我想要對一檔案讀寫但是會多出一行是最後一行的部份內容.. 程式碼(Code)：(請善用置底文網頁, 記得排版) 該檔長這樣 =======meter.txt start===== light5,2ECB2801004B1200,light,- light6,2ECB2801004B1200,light,- A2,C3192101004B2000,light,- A3,C3192101004B2000,light,- curtain1,5ac32801004b1200,curtain,room1 curtain3,C3192101004B1200,curtain,- =======meter.txt end===== 底下為code int main() { FILE *fp; int i=0; int count=0; char array[50][100]={'\0'}; char name[50][30]={'\0'}; char ieee[50][20]={'\0'}; char class[50][20]={'\0'}; char room[50][30]={'\0'}; char buf[100]={'\0'}; int buf_len=0; fp = fopen("meter.txt","rb+"); if(fp!=NULL) { while(fgets(array[count],100,fp)) { strcpy(name[count],strtok(array[count],",\n")); strcpy(ieee[count],strtok(NULL,",\n")); strcpy(class[count],strtok(NULL,",\n")); strcpy(room[count],strtok(NULL,",\n")); count++; } fseek(fp,0,SEEK_SET); for(i=0;i<count;i++) { if(strcmp(name[i],"A2")==0) { sprintf(buf,"%s\n","this is work!!"); buf_len=strlen(buf); fwrite(buf,buf_len,1,fp); continue; } else { sprintf(buf,"%s,%s,%s,%s\n",name[i],ieee[i],class[i],room[i]); buf_len=strlen(buf); fwrite(buf,buf_len,1,fp); } } return 0; } 補充說明(Supplement)：不知道哪邊出錯... 本預期結果是這樣 light5,2ECB2801004B1200,light,- light6,2ECB2801004B1200,light,- this is work!! A3,C3192101004B2000,light,- curtain1,5ac32801004b1200,curtain,room1 curtain3,C3192101004B1200,curtain,- 結果變這樣 light5,2ECB2801004B1200,light,- light6,2ECB2801004B1200,light,- this is work!! A3,C3192101004B2000,light,- curtain1,5ac32801004b1200,curtain,room1 curtain3,C3192101004B1200,curtain,- 00,curtain,- <==多這一行這問題可能很基本但就是不知道問題在哪裡請大大開示... -- 5L36f6d6I5207573K657273206f6E62066Y697265O666f78206172U65207375636b2e -- ※ 發信站: 批踢踢實業坊(ptt.cc) ◆ From: 211.78.167.138