C++ (Cpp) CField::ConvertToCurField Examples

Example #1

File: cfield.cpp Project: adoggie/algorithm_package

/************************************************************************************
函数名称：
bool CField::LoadDataFromBuffer(LPBYTE& lpIndicate, LPBYTE& lpData)
功能说明：虚函數,读取一条记录某一字段的数据,可以用来读取值标签.

详细解释：1.子类实现.      

出入参数：
[in]: 1.lpIndicate:指示字节地址.
      2.lpData    :数据地址.
  
[out]:1.lpIndicate:下一数据块的指示字节地址.
      2.lpData    :下一数据块的数据地址.　

返回类型：bool

制作：YTLI 2002/07/12

修改: 
************************************************************************************/
void CField::LoadDataFromBuffer( LPBYTE& lpData)
{	
	if(m_pValue==NULL)
	{//旧版本
		if(m_nNextModifyField == -1)
		{
			NewData();
			LoadDataFromBuffer(lpData);			
			DeleteData();
		}
		else
		{
			if(m_pFields->IsConvertToLastVersion(this))
			{
				NewData();
				LoadDataFromBuffer(lpData);
				CField* pNewField = m_pFields->m_FieldVersion.GetFieldByAbsolutePos(m_nNextModifyField);
				pNewField->ConvertToCurField(this); 
				DeleteData();
			}
		}
	}
	else
	{//当前最新
		if (GetFieldType() == fString)
		{
			FieldString* pStr = (FieldString*)m_pValue;
			char *pBuf = new char[m_nWidth+2];
			memset(pBuf,0,m_nWidth+2);
			memcpy(pBuf,lpData,m_nWidth);
			*pStr= pBuf;
			/*
  			char* lpstr = pStr->GetBuffer(m_nWidth+2);
			memcpy(lpstr,lpData,m_nWidth);
			*(lpstr+m_nWidth)= 0;
			*(lpstr+m_nWidth+1)= 0;
			pStr->ReleaseBuffer();	
			*/
			//pStr->TrimLeft();//,左边空格保留
			pStr->TrimRight();   

			
			lpData =  lpData + Align4(m_nWidth);
		}
		else
		{
			memcpy( &*((FieldNUM *)m_pValue), lpData, sizeof(FieldNUM) );	//ytli Modify 2002/09/04
			lpData =  lpData + sizeof(FieldNUM);
		}
		
	}
}

Example #2

File: cfield.cpp Project: adoggie/algorithm_package

//将原来版本的字段数据转换到当前字段的数据。
//1。如果本字段空间为空，生成空间
//2。要进行原来字段空值判断！
//2。1如果为空则本字段为空
//2。2如果不为空则将原来的数据以原来的数据类型读    出，然后调用本字段的SetAs***设置。
//然后，如果有新的next字段，则调用该字段的ConvertToCurField函数，并且负责释放本空间，并且清0
void CField::ConvertToCurField(CField* pOldField)
{
	/*
	if(this->GetFieldType() == fString)
	{
		ConvertToCurField(pOldField);
		return ;
	}
*/
	if(!m_pValue)
	{//本字段也为中间字段
		NewData();

		if(pOldField->IsNull())
			SetNull();
		else
		{
			CFieldType ftType = pOldField->GetFieldType();
			if( ftType == fBoolean )			
				SetAsBool( pOldField->GetAsBool());

			else if( ftType == fCurrency )			
				SetAsCurrency( pOldField->GetAsCurrency());

			else if( ftType == fDate )			
				//SetAsBool( pOldField->GetAsDateTime());
				SetAsBool( true);//#_修改 2002-12-2 $ 10:01:35 zlq
			else if( ftType == fDouble )			
				SetAsDouble( pOldField->GetAsDouble());

			else if( ftType == fInt )			
				SetAsInteger( pOldField->GetAsInteger());

			else if( ftType == fString )			
				SetAsString( pOldField->GetAsString());		

			//assert(m_nNextModifyField != -1);

			CField* pNewField = m_pFields->m_FieldVersion.GetFieldByAbsolutePos(m_nNextModifyField);
			pNewField->ConvertToCurField(this); 			
		}
		DeleteData();
	}
	else   //最后一层转换.
	{
		if(pOldField->IsNull())		
			SetNull();			
		else
		{
			if( pOldField->GetFieldType() == fBoolean )			
				SetAsBool( pOldField->GetAsBool());

			else if( pOldField->GetFieldType() == fCurrency )			
				SetAsCurrency( pOldField->GetAsCurrency());

			else if( pOldField->GetFieldType() == fDate )			
				//SetAsBool( pOldField->GetAsDateTime());
				SetAsBool( true);

			else if( pOldField->GetFieldType() == fDouble )			
				SetAsDouble( pOldField->GetAsDouble());

			else if( pOldField->GetFieldType() == fInt )			
				SetAsInteger( pOldField->GetAsInteger());

			else if( pOldField->GetFieldType() == fString )			
				SetAsString( pOldField->GetAsString());		

			//assert(m_nNextModifyField == -1);
		}
	}
}