/************************************************************************************
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);
}
}
}
//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);
}
}
}