这个程序有内存错误，怎么修改？

[NetDoggy]

程序是在本地拷贝文件。

void CFileDlg::OnButton1()
{
// TODO: Add your control notification handler code here
const int size = 512;
char * buf;
CString s;
UpdateData();
CFile file,file1;
file1.Open((LPCTSTR) m_edit2, CFile::modeCreate | CFile::modeWrite);
if (file.Open((LPCTSTR) m_edit1, CFile::modeRead))
{
int length = file.GetLength();
int uBytesRead = 0;
int total = 0;
for (; total != length; )
{
buf = new char[size];
uBytesRead = file.Read(buf,size);
total += uBytesRead;
buf[uBytesRead] = '\0';
file1.Write(buf, uBytesRead);
delete[] buf;// 这里有错
}
file1.Close();
file.Close();
}
else AfxMessageBox("No file found!");

}

[WvW]

uBytesRead

可能是数组越界

[broadoceans]

如下修改：
void CFileDlg::OnButton1()
{
// TODO: Add your control notification handler code here
const int size = 512;
char * buf;
CString s;
UpdateData();
CFile file,file1;
file1.Open((LPCTSTR) m_edit2, CFile::modeCreate | CFile::modeWrite);
if (file.Open((LPCTSTR) m_edit1, CFile::modeRead))
{
int length = file.GetLength();
int uBytesRead = 0;
int total = 0;
buf = new char[size];

for (; total != length; )
{
uBytesRead = file.Read(buf,size);
total += uBytesRead;
buf[uBytesRead] = '\0';
file1.Write(buf, uBytesRead);
}
delete[] buf;
file1.Close();
file.Close();
}
else AfxMessageBox("No file found!");

}

因为VC在实现方面和标准C++有区别。

[WvW]

file1.Write(buf, uBytesRead);

这句话也可能错误呢

[tleon]

#include "io.h"

FILE *hSFile, hDFile;
hSFile = fopen("123.Text", "rt");
if (hSFile == NULL)
return;
hDFile = fopen("12354.Txt", "w+t");
if (hDFile == NULL)
{
fclose(hSFile);
return;
}


LONG nLength = _filelength(_fileno(hSFile));

byte *buf = new byte[nLength];
if (buf == NULL)
{
fclose(hSFile);
fclose(hDFile);
}

fread(buf, 1, nLength, hSFile);
fclose(hSFile);
fwrite(buf, 1, nLength, hDFile);
fclose(hDFile);

[tleon]

少了一句

LONG nLength = _filelength(_fileno(hSFile));

byte *buf = new byte[nLength];
if (buf == NULL)
{
fclose(hSFile);
fclose(hDFile);
}

fread(buf, 1, nLength, hSFile);
fclose(hSFile);
fwrite(buf, 1, nLength, hDFile);
fclose(hDFile);


//////
delete []buf;