CreateFile 打开文件重新写入失败，但GetlastError没有失败提示，

[coFinder]

我有一颗双亲树，顺序数组存放，要保存到文件里面。每次树被更新之后就要写到文件里面去，

可是下面这个函数运行没有错误，但文件总是没有得到更新

int PtTree::SaveToFile(LPCTSTR Filename)
{
//	::DeleteFile(Filename);
//情况内容，
	HANDLE hIndex = ::CreateFile(
		Filename
		,GENERIC_WRITE
		,0
		,NULL
		,TRUNCATE_EXISTING
		,FILE_ATTRIBUTE_NORMAL
		,NULL);

//打开成功但就是没有把文件更新
	if( INVALID_HANDLE_VALUE  == hIndex )
	{	
		ShowError();
		return 0;
	}
	DWORD dwNumberOfBytes;

	::SetFilePointer( hIndex, 0, 0 , FILE_BEGIN );

	//写入节点个数
	if(0 == WriteFile( hIndex, (LPVOID) &NodeCount, sizeof(NodeCount), &dwNumberOfBytes, NULL ) )
	{	
		ShowError();
		CloseHandle(hIndex);
		return 0 ;
	}

	//写入叶子节点个数
	if(0 == WriteFile( hIndex, (LPVOID)&LeafCount, sizeof(LeafCount), &dwNumberOfBytes, NULL ) )
	{	
		ShowError();
		CloseHandle(hIndex);
		return 0 ;
	}

//写入顺序树信息 ,这里在单步的时候可以看到dwNumberOfBytes为500，但文件的大小还是原来的248B
	if(NodeCount && 0 == WriteFile( hIndex, (LPVOID)( &node), (NodeCount) * sizeof(PtNode), &dwNumberOfBytes, NULL ) )
	{	
		ShowError();
		CloseHandle(hIndex);
		return 0 ;
	}

	//写入叶子数组
	if(LeafCount && 0 == WriteFile( hIndex, (LPVOID)(&Leaf), (LeafCount) * sizeof(int), &dwNumberOfBytes, NULL ) )
	{	
		ShowError();
		CloseHandle(hIndex);
		return 0 ;
	}
		
	CloseHandle(hIndex);

	return 1;
}

[赵4老师]

FlushFileBuffers The FlushFileBuffers function clears the buffers for the specified file and causes all buffered data to be written to the file. BOOL FlushFileBuffers( HANDLE hFile // open handle to file whose buffers are to be // flushed ); Parameters hFile An open file handle. The function flushes this file's buffers. The file handle must have GENERIC_WRITE access to the file. If hFile is a handle to a communications device, the function only flushes the transmit buffer. If hFile is a handle to the server end of a named pipe, the function does not return until the client has read all buffered data from the pipe. Windows NT: The function fails if hFile is a handle to console output. That is because console output is not buffered. The function returns FALSE, and GetLastError returns ERROR_INVALID_HANDLE. Windows 95: The function does nothing if hFile is a handle to console output. That is because console output is not buffered. The function returns TRUE, but it does nothing. Return Values If the function succeeds, the return value is nonzero. If the function fails, the return value is zero. To get extended error information, call GetLastError. Remarks The WriteFile and WriteFileEx functions typically write data to an internal buffer that the operating system writes to disk on a regular basis. The FlushFileBuffers function writes all of the buffered information for the specified file to disk. You can pass the same file handle used with the _lread, _lwrite, _lcreat, and related functions to FlushFileBuffers. QuickInfo Windows NT: Requires version 3.1 or later. Windows: Requires Windows 95 or later. Windows CE: Unsupported. Header: Declared in winbase.h. Import Library: Use kernel32.lib. See Also File I/O Overview, File Functions, _lread, _lwrite, _lcreat, WriteFile, WriteFileEx

[科比布莱恩特]

引用 楼主 lilien1010 的回复:

我有一颗双亲树，顺序数组存放，要保存到文件里面。每次树被更新之后就要写到文件里面去， 可是下面这个函数运行没有错误，但文件总是没有得到更新 C/C++ code?1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545……

文件第二次不刷你可以重刷 一次。 很简单的返回一个操作的结果，判断是否返回成功即可。