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ofstream outFile;
outFile.open(fileName,ios::binary | ios::ate | ios::trunc |ios::in);
if(outFile.is_open())
{
outFile.seekp(iPosition,ios::beg);
outFile.write((const char*)&sheet.m_iOffset,sizeof(long)); //将偏移量按照指定的字节数放到表文件中
outFile.write((const char*)&sheet.m_iFlag,sizeof(int));
outFile.close();