急:读出的文件内容总是在后面加几个乱吗.(在线)

[大鸟的小天空]

开始是使用大文件,程序运行,第一次执行此函数可以获得正确的内容,第二次执行就会在文件内容尾部加几个乱码.
程序关闭,重新开始,第一次是正确的,在用,就加乱码.

之后,将文件内容删除,只剩2个字符,每次获得的都是正确内容+乱码
try
{
FILE * stream;
AnsiString T;
if((stream = fopen("sftb.sql","r"))==NULL){
return "";
}

fseek(stream, 0, SEEK_END);
int nLen = ftell(stream);
fseek(stream, 0, SEEK_SET);

char * cT;
cT = new char[nLen];
ShowMessage(nLen);
fread(cT,nLen,1,stream);
fclose(stream);

T = (AnsiString)cT;
ShowMessage(T);
delete cT;


return T;
}
catch(...)
{
return "";
}

[yjy1001]

cT = new char[nLen+1];// 加 一个 1

删除的时候 也要改改

应该是

delete [] cT; //看看帮助吧 new [] 和 delete [] 要成对，要不 你就释放不全

估计是 char 的内存不够，导致的 文件关闭的位置没有问题。

[weibz0525]

应该这样写
char * cT;
cT = new char[nLen+1];

末尾加上'\0'

[wuxq7311]

cT = new char[nLen+1];

delete [] cT;

[ljianq]

cT = new char[nLen];
delete []cT;//需要注意,不然内存泄露。

[jishiping]

修正后的代码：
try
{
FILE * stream;
AnsiString T;
if((stream = fopen("sftb.sql","rb"))==NULL){
return "";
}

fseek(stream, 0, SEEK_END);
int nLen = ftell(stream);
fseek(stream, 0, SEEK_SET);

char * cT;
cT = new char[nLen+1];
ShowMessage(nLen);
nLen = fread(cT,1,nLen,stream);
cT[nLen] = 0; fclose(stream);

T = (AnsiString)cT;
ShowMessage(T);
delete[] cT;

return T;
}
catch(...)
{
return "";
}

[chifengwatch]

//注意
delete []cT;

[chifengwatch]

还有数组的最大下标应是'\0'

[slhuang]

将你的fclose(stream);这个语句放在delete cT后面。
就不会出现乱吗了。