Solved

TByteField

Posted on 1998-02-03
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Last Modified: 2010-05-18
How can i get the value of a TByteField in a dataset.

fieldtype in mssql = binary.

procedure TfrmFaxOut.tblxxxGetText(Sender: TField; var Text: String;
  DisplayText: Boolean);
begin
 x := Sender.Value;  // dont work !!!
end;

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Question by:gipa
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6 Comments
 

Author Comment

by:gipa
ID: 1358162
Edited text of question
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LVL 5

Expert Comment

by:JimBob091197
ID: 1358163
For binary data, you can use a TBlobField.
If this is what you want, then you can look at:
http://www.experts-exchange.com/topics/bin/ShowQ?qid=8630035244

What type is "x" in "x := Sender.Value"?

JB
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LVL 2

Expert Comment

by:Waldek
ID: 1358164
What type is x
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LVL 2

Accepted Solution

by:
Waldek earned 50 total points
ID: 1358165
This may be a solution:
with field do
 begin
 if  not IsBlob then {Only for TByteFIeld}
   begin
    GetMem(Buffer,DataSize) //Must have a buffer with length datasize
 try
  if not GetData(Buffer) then // get a data from field
      messageDlg(' Field is NULL .........
    else
       // here Your work
   finally
     FreeMem(Buffer,DataSize);
 end;
end;
end;
0
 

Author Comment

by:gipa
ID: 1358166
Waldek ,
How can i pass the value (it should be 0 or 1)

procedure TfrmFaxOut.tblFAXOEXTRGetText(Sender: TField; var Text: String;
  DisplayText: Boolean);
var
  buffer : PChar;
begin
  with sender do begin
    if not IsBlob then {Only for TBytesField}
    begin
      GetMem(Buffer, DataSize); //Must have a buffer with length datasize
      try
        if not GetData(Buffer) then // get a data from field
          showmessage('Field is null')
        else
          // here Your work
          Text := xxx  <----- How can i pass the value (it should be 0 or 1)
      finally
        FreeMem(Buffer,DataSize);
      end;
    end;
  end;
end;

0
 
LVL 2

Expert Comment

by:Waldek
ID: 1358167
You may convert PChar to string and select Buffer[1] char
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