subject_39802.htm

vc

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序号：39802 发表者：Chuicy 发表日期：2003-05-13 20:57:05
<br>主题：fread and fwrite
<br>内容：It should be very simple, but I really can't find the problem.so for help:<BR><BR>&nbsp;&nbsp;&nbsp;&nbsp;FILE *fp1;<BR>&nbsp;&nbsp;&nbsp;&nbsp;FILE *fp2;<BR>&nbsp;&nbsp;&nbsp;&nbsp;fp1=fopen("text_transmit.txt","rb");<BR>&nbsp;&nbsp;&nbsp;&nbsp;fp2=fopen("text_receive.txt","wb");<BR>&nbsp;&nbsp;&nbsp;&nbsp;int i=0;<BR>&nbsp;&nbsp;&nbsp;&nbsp;while((getc(fp1))!=EOF)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;i++;<BR>&nbsp;&nbsp;&nbsp;&nbsp;int nr_size_short=i;<BR>&nbsp;&nbsp;&nbsp;&nbsp;char *a=new char[nr_size_short];<BR>&nbsp;&nbsp;&nbsp;&nbsp;fread(a,sizeof(char),nr_size_short,fp1); <BR><BR>&nbsp;&nbsp; //when comes to this,the value is a is totally wrong, just -51 'f',?//<BR><BR>&nbsp;&nbsp;&nbsp;&nbsp;fclose(fp1);<BR>&nbsp;&nbsp;&nbsp;&nbsp;fwrite(a,sizeof(char),nr_size_short,fp2);<BR>&nbsp;&nbsp;&nbsp;&nbsp;fclose(fp2);<BR>
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<font color=red>答案被接受</font><br>回复者：dr0 回复日期：2003-05-13 21:27:50
<br>内容：fread(a,sizeof(char),nr_size_short,fp1); 　<BR>// when your codes comes here, the FILE pointer is now pointing to the<BR>// nr_size_short + 1, so when you call the fread() , it will read from<BR>// the nr_size_short + 1. you can reset the FILE pointer to the begining<BR>// use fseek(fp1, 0, 0). have a try ? 
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