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char data[255]={0},user[15],password[32];

if((fp=fopen("QQ.ini","wb+"))==NULL)
{
printf("ÎÞ·¨´´½¨QQ.iniÎļþ\n");
system("pause");
exit(0);
}
else
{
printf("³õʼ»¯Êý¾ÝÉÐδ´´½¨\nÇëÊäÈëQQÕ˺Å:");
gets(user);
printf("ÇëÊäÈëQQÃÜÂë:");
gets(password);
sprintf(data,"user:%spassword:%s",user,password);
fwrite(data,strlen(data),1,fp);
memset(data,0,255);
fseek(fp,0L,0);
fread(data,strlen(data),1,fp);
printf("Êä³ö:%s\n",data);
fclose(fp);
printf("´´½¨³õʼ»¯Îļþ³É¹¦\n");
}
ΪʲôÊä³ö½á¹ûΪ¿Õ£¿£¿´´½¨µÄQQ.iniÎļþÕý³££¬ÎÊÌâ¾ÍÊÇÎÞ·¨´ÓÕâ¸öÎļþ¶Á³öÊý¾Ý
ÎÒÒ»ÏòÓÃ"w+b"

strlen(data)ºÃÏñÊÇ0

ÎÊÌâÖØÐÂÃèÊöÏ£º
ÎÒÓиöQQ.ini£¬ÀïÃæÄÚÈÝÊÇ:user:35555password:444
ÕâÊÇÎÒfwrite(data,strlen(data),1,fp);Ò»´ÎдÈëµÄ£¬´ò¿ª·½Ê½wb closeÎļþ

È»ºóÎÒµÚ¶þ´ÎÔËÐгÌÐò£¬Ïë¶ÁÈ¡Õâ¸öÎı¾Êý¾Ý
rb·½Ê½´ò¿ª£¬È·±£ÎļþÖ¸Õë²»¿Õºó£¬fseek(fp,0L,2);fread(data,ftell(fp),1,fp)£»
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ΪʲôµÃµ½µÄ½á¹ûÊÇ¿Õ×Ö´®£¿£¿£¿£¿£¿

memset(data,0,255);
Ö®ºóstrlen(data)=0
¶Á0³¤¶È,µ±È»ÊÇ¿Õ

µÚ¶þÖÖ:
fseek(fp,0L,2);
long l = ftell(fp);
fseek(fp,0L,0);
fread(data,l,1,fp);
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