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Nerio
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 Posted: Thu Jul 14, 2005 4:29 pm Post subject: ValueListEditor and ADOBlobStream |
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I wrote part of a program where, in a ADODataSet, record by record I collect
a lot of field names and their respective content transferring them into a
ValueListEditor. Next :
---
ADOTableX->Edit();
TADOBlobStream *BS = new TADOBlobStream TBlobField *) ADOTableXAnalisys,
bmWrite);
try
{ S = ValueList->Strings->Text.Length() + 1; char *P = new char[S];
try
{ P = ValueList->Strings->Text.c_str();
BS->Write(P, S);
}
catch(...)
{ delete P; throw; }
delete P;
}
catch(...)
{ delete BS; throw; }
delete BS;
ADOTableX->Post; // all those to fill the Access BlobField named Analisys
---
passing to to following record but I have an access exception writing to the
blob field (not always at the same record)
Can you explain what happen
Thanks Nerio
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Viatcheslav V. Vassiliev
Guest
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| Posted: Thu Jul 14, 2005 5:14 pm Post subject: Re: ValueListEditor and ADOBlobStream |
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| Quote: | { S = ValueList->Strings->Text.Length() + 1; char *P = new char[S];
|
Here you allocate P
| Quote: | try
{ P = ValueList->Strings->Text.c_str();
|
Here you assign to P new value, previously allocated block is not
referenced. It is NOT copy operation.
Here you free memory from block returned by
ValueList->Strings->Text.c_str(), not block allocated in new char[S]. Later
C++ Builder frees AnsiString, but its memory is freed before by delete P.
AnsiString s = ValueList->Strings->Text;
BS->Write(S.c_str(), S.Length() + 1);
or something like this should work.
//------------------------------------------
Regards,
Vassiliev V. V.
http://www.managed-vcl.com - using .Net objects in Delphi for Win32 +
ADO.Net
http://www.oledbdirect.com - The fastest way to access MS SQL Server,
MS Jet (Access) and Interbase (through OLEDB)
"Nerio" <ne_serzanti (AT) tin (DOT) it> сообщил/сообщила в новостях следующее:
news:42d692d4$1 (AT) newsgroups (DOT) borland.com...
| Quote: | I wrote part of a program where, in a ADODataSet, record by record I
collect a lot of field names and their respective content transferring them
into a ValueListEditor. Next :
---
ADOTableX->Edit();
TADOBlobStream *BS = new TADOBlobStream TBlobField *) ADOTableXAnalisys,
bmWrite);
try
BS->Write(P, S);
}
catch(...)
{ delete P; throw; }
delete P;
}
catch(...)
{ delete BS; throw; }
delete BS;
ADOTableX->Post; // all those to fill the Access BlobField named Analisys
---
passing to to following record but I have an access exception writing to
the blob field (not always at the same record)
Can you explain what happen
Thanks Nerio
|
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Nerio
Guest
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| Posted: Thu Jul 14, 2005 9:09 pm Post subject: Re: ValueListEditor and ADOBlobStream |
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Very good
Excuse if I exceed in questions but I have same problem with reading from
BlobField.
And more : how I can point to a row and then read Values content of a
ValueListString (for key value I use Keys[index] and there is no problem.
I would like to read some deep documentation on the matter and examples but
I don't know where find them.
Many tnx for help
Nerio
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Nerio
Guest
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| Posted: Fri Jul 15, 2005 9:11 am Post subject: Re: ValueListEditor and ADOBlobStream |
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Reading problem by TBlobStream solved. Thanks
Nerio
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