请教:将图片存入SQL数据库的image字段,使用流类,出错,怎么解决?
ADOQuery1->Close();
ADOQuery1->SQL->Clear();
ADOQuery1->Append();
TBlobField * pBlob=(TBlobField *)ADOQuery1->FieldByName("myphoto");
TBlobStream *pStream=new TBlobStream(pBlob,bmReadWrite);//程序执行到此出错
Project Project1.exe raised exception class EInvalidCast with message
'Invalid class typecast'.Process stopped,Use Step or Run to continue.
应该怎样修改?