fwrite(,,,)函數(shù)

1、fwrite函數(shù)1.函數(shù)功能用來(lái)讀寫(xiě)一個(gè)數(shù)據(jù)塊。2.一般調(diào)用形式fwrite(buffer,size,count,fp);3.說(shuō)明（1）buffer：是一個(gè)指針，對(duì)fread來(lái)說(shuō)，它是讀入數(shù)據(jù)的存放地址。對(duì)fwrite來(lái)說(shuō)，是要輸出數(shù)據(jù)的地址。（2）size：要讀寫(xiě)的字節(jié)數(shù)；（3）count:要進(jìn)行讀寫(xiě)多少個(gè)size字節(jié)的數(shù)據(jù)項(xiàng)；（4）fp:文件型指針   這是工作中用 fwrite函數(shù)寫(xiě)的例子，不僅記錄下自己的學(xué)習(xí)情況，也分享給各位朋友這個(gè)fwrite函數(shù)實(shí)例。 這個(gè)fwrite實(shí)例是當(dāng)前時(shí)間寫(xiě)入文本的程序，下面這個(gè)是fwrite函數(shù)的使用方法。int mark

2、file(void )    FILE *sp ;/    char buff512 ;    char count = 0;    char *currentime = NULL;    char *wday = "Sun","Mon","Tue","Wed","Thu","Fri","Sat" 

3、   time_t timep;    struct tm *p;    time(&timep);    p = localtime(&timep);    currentime = ctime(&timep);/    memset(buff,0,512);/    sprintf(buff,"%s",currentime);  

4、  printf("%d/%d/%d",(1900+p->tm_year),(1+p->tm_mon),p->tm_mday);    printf(" %s %d:%d:%dn",wdayp->tm_wday,p->tm_hour,p->tm_min,p->tm_sec);    if(sp = fopen("/root/kay/mark.txt","a+") = NULL)  &#

5、160;    return 0;    fwrite(currentime,size(currentime)-1,1,sp);    fclose(sp);    return 1;size(currentime)（ = 26 ）的作用是得出指針currentime所指的字符串的個(gè)數(shù)（包括'0'）,但是會(huì)輸出亂碼（應(yīng)該是字符串的個(gè)數(shù)太長(zhǎng)了），因此，我把個(gè)數(shù)減掉一個(gè)，就能舒適正確結(jié)果。用另外一種方法：int markfile(void )  

6、;  FILE *sp ;    char buff512 ;    char count = 0;    char *currentime = NULL;    char *wday = "Sun","Mon","Tue","Wed","Thu","Fri","Sat"    time_t tim

7、ep;    struct tm *p;    time(&timep);    p = localtime(&timep);    currentime = ctime(&timep);/    memset(buff,0,512);    sprintf(buff,"%s",currentime);    printf("%d/%

8、d/%d",(1900+p->tm_year),(1+p->tm_mon),p->tm_mday);    printf(" %s %d:%d:%dn",wdayp->tm_wday,p->tm_hour,p->tm_min,p->tm_sec);    if(sp = fopen("/root/kay/mark.txt","a+") = NULL)       return 0;    fwrite(currentime,(count = strlen(buff),1,sp);    printf("%dn",count);    fclose(sp);    return 1;count = strlen(buff) 來(lái)獲得