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Andidreas

Registriert seit: 27. Okt 2005
1.110 Beiträge
 
Delphi 10.1 Berlin Enterprise
 
#1

Invalid Class Typecast

  Alt 18. Sep 2013, 16:10
Datenbank: MS SQL Server • Version: 2008 • Zugriff über: UniDac
Hallo,

ich steh grad ziemlich aufm Schlauch...

Ich hab eine MS SQL Tabelle in der sich zehn Blob Daten Felder befinden --> Typ varbinary(max)
In diese will ich Attachments für einen Mail Versand einfügen...

Zum Testen habe ich mir eine Form gebastelt in der der folgende Source ausgeführt wird:

Delphi-Quellcode:
procedure Tmaintenance_testmailing_form.advglowbtn_sendmailClick(Sender: TObject);

var
i : Integer;
ms1, ms2, ms3, ms4, ms5, ms6, ms7, ms8, ms9, ms10 : TMemoryStream;
sfn1, sfn2, sfn3, sfn4, sfn5, sfn6, sfn7, sfn8, sfn9, sfn10 : String;

begin

  //Check Entries
  If (StringReplace(edt_mailproject.Text, ' ', '', [rfReplaceAll]) = EmptyStr) Or
     (StringReplace(edt_mailapplication.Text, ' ', '', [rfReplaceAll]) = EmptyStr) Or
     (StringReplace(edt_mailsubject.Text, ' ', '', [rfReplaceAll]) = EmptyStr) Or
     (StringReplace(edt_mailsenderadress.Text, ' ', '', [rfReplaceAll]) = EmptyStr) Or
     (StringReplace(edt_mailsendertext.Text, ' ', '', [rfReplaceAll]) = EmptyStr) Or
     (StringReplace(edt_mailrecipient.Text, ' ', '', [rfReplaceAll]) = EmptyStr) Then
  Begin
    fnDisplayMyActionBox('ERR', 'Error', 'Entries are not complete!', EmptyStr, EmptyStr, EmptyStr, True);
    Exit;
  End;

  //Check count of Attachments
  If lstbox_attachments.Count > 10 Then
  Begin
    fnDisplayMyActionBox('ERR', 'Error', 'More than 10 Attachments!', 'Only max. 10 Attachments allowed!', EmptyStr, EmptyStr, True);
    Exit;
  End;


  Try
    //Load Attachments in Memory Streams
    For i := 0 To lstbox_attachments.Count -1 Do
    Begin
      Try
        Case i of
          //Attachment #1
          0: begin
            ms1 := TMemoryStream.Create;
            ms1.LoadFromFile(lstbox_Attachments.Items.Strings[i]);
            sfn1 := fnGetFileName(lstbox_Attachments.Items.Strings[i]);
          end;
          //Attachment #2
          1: begin
            ms2 := TMemoryStream.Create;
            ms2.LoadFromFile(lstbox_Attachments.Items.Strings[i]);
            sfn2 := fnGetFileName(lstbox_Attachments.Items.Strings[i]);
          end;
          //Attachment #3
          2: begin
            ms3 := TMemoryStream.Create;
            ms3.LoadFromFile(lstbox_Attachments.Items.Strings[i]);
            sfn3 := fnGetFileName(lstbox_Attachments.Items.Strings[i]);
          end;
          //Attachment #4
          3: begin
            ms4 := TMemoryStream.Create;
            ms4.LoadFromFile(lstbox_Attachments.Items.Strings[i]);
            sfn4 := fnGetFileName(lstbox_Attachments.Items.Strings[i]);
          end;
          //Attachment #5
          4: begin
            ms5 := TMemoryStream.Create;
            ms5.LoadFromFile(lstbox_Attachments.Items.Strings[i]);
            sfn5 := fnGetFileName(lstbox_Attachments.Items.Strings[i]);
          end;
          //Attachment #6
          5: begin
            ms6 := TMemoryStream.Create;
            ms6.LoadFromFile(lstbox_Attachments.Items.Strings[i]);
            sfn6 := fnGetFileName(lstbox_Attachments.Items.Strings[i]);
          end;
          //Attachment #7
          6: begin
            ms7 := TMemoryStream.Create;
            ms7.LoadFromFile(lstbox_Attachments.Items.Strings[i]);
            sfn7 := fnGetFileName(lstbox_Attachments.Items.Strings[i]);
          end;
          //Attachment #8
          7: begin
            ms8 := TMemoryStream.Create;
            ms8.LoadFromFile(lstbox_Attachments.Items.Strings[i]);
            sfn8 := fnGetFileName(lstbox_Attachments.Items.Strings[i]);
          end;
          //Attachment #9
          8: begin
            ms9 := TMemoryStream.Create;
            ms9.LoadFromFile(lstbox_Attachments.Items.Strings[i]);
            sfn9 := fnGetFileName(lstbox_Attachments.Items.Strings[i]);
          end;
          //Attachment #10
          9: begin
            ms10 := TMemoryStream.Create;
            ms10.LoadFromFile(lstbox_Attachments.Items.Strings[i]);
            sfn10 := fnGetFileName(lstbox_Attachments.Items.Strings[i]);
          end;
        End;
      Except
        On E:Exception Do
        Begin
          fnDisplayMyActionBox('ERR', 'Error', 'Could not load Attachment into Memory Stream', lstbox_Attachments.Items.Strings[i], E.Message, EmptyStr, True);
        End;
      End;
    End;

    //Insert Test Record into MS SQL Table Mail
    Try
      With (MSSQL_Query1) Do
      Begin
        Active := False;
        SQL.Clear;
        SQL.Add(' Insert Into "' + ModuleUniDBSchema + '.Mail" ');
        SQL.Add(' ( ');
        SQL.Add(' Mail_Project, Mail_Application, Mail_Subject, Mail_SenderAdress, Mail_SenderText, ');
        SQL.Add(' Mail_Recipient, Mail_CC, Mail_Message, Mail_AttachmentCount, Mail_Stati ');

        For i := 0 To lstbox_Attachments.Count -1 Do
        Begin
          SQL.Add(' , Mail_AttachmentName' + IntToStr(i+1));
          SQL.Add(' , Mail_Attachment' + IntToStr(i+1));
        End;

        SQL.Add(' ) ');

        SQL.Add(' Values( ');
        SQL.Add(' :Mail_Project, :Mail_Application, :Mail_Subject, :Mail_SenderAdress, :Mail_SenderText, ');
        SQL.Add(' :Mail_Recipient, :Mail_CC, :Mail_Message, :Mail_AttachmentCount, :Mail_Stati ');

        For i := 0 To lstbox_Attachments.Count -1 Do
        Begin
          SQL.Add(' , :Mail_AttachmentName' + IntToStr(i+1));
          SQL.Add(' , :Mail_Attachment' + IntToStr(i+1));
        End;

        SQL.Add(' ) ');

        ParamByName('Mail_Project').AsString := edt_mailproject.Text;
        ParamByName('Mail_Application').AsString := edt_mailapplication.Text;
        ParamByName('Mail_Subject').AsString := edt_mailsubject.Text;
        ParamByName('Mail_SenderAdress').AsString := edt_mailsenderadress.Text;
        ParamByName('Mail_SenderText').AsString := edt_mailsendertext.Text;
        ParamByName('Mail_Recipient').AsString := edt_mailrecipient.Text;
        ParamByName('Mail_CC').AsString := edt_mailcc.Text;
        ParamByName('Mail_Message').AsString := mem_mailtext.Text;
        ParamByName('Mail_AttachmentCount').AsString := IntToStr(lstbox_attachments.Count);
        ParamByName('Mail_Stati').AsString := '10';

        For i := 0 To lstbox_Attachments.Count -1 Do
        Begin
          Case i of
            //Attachment #1
            0: begin
              ParamByName('Mail_AttachmentName1').AsString := sfn1;
              ParamByName('Mail_Attachment1').SetBlobData(ms1.Memory, ms1.Size);
            end;
            //Attachment #2
            1: begin
              ParamByName('Mail_AttachmentName2').AsString := sfn2;
              ParamByName('Mail_Attachment2').SetBlobData(ms2.Memory, ms2.Size);
            end;
            //Attachment #3
            2: begin
              ParamByName('Mail_AttachmentName3').AsString := sfn3;
              ParamByName('Mail_Attachment3').SetBlobData(ms3.Memory, ms3.Size);
            end;
            //Attachment #4
            3: begin
              ParamByName('Mail_AttachmentName4').AsString := sfn4;
              ParamByName('Mail_Attachment4').SetBlobData(ms4.Memory, ms4.Size);
            end;
            //Attachment #5
            4: begin
              ParamByName('Mail_AttachmentName5').AsString := sfn5;
              ParamByName('Mail_Attachment5').SetBlobData(ms5.Memory, ms5.Size);
            end;
            //Attachment #6
            5: begin
              ParamByName('Mail_AttachmentName6').AsString := sfn6;
              ParamByName('Mail_Attachment6').SetBlobData(ms6.Memory, ms6.Size);
            end;
            //Attachment #7
            6: begin
              ParamByName('Mail_AttachmentName7').AsString := sfn7;
              ParamByName('Mail_Attachment7').SetBlobData(ms7.Memory, ms7.Size);
            end;
            //Attachment #8
            7: begin
              ParamByName('Mail_AttachmentName8').AsString := sfn8;
              ParamByName('Mail_Attachment8').SetBlobData(ms8.Memory, ms8.Size);
            end;
            //Attachment #9
            8: begin
              ParamByName('Mail_AttachmentName9').AsString := sfn9;
              ParamByName('Mail_Attachment9').SetBlobData(ms9.Memory, ms9.Size);
            end;
            //Attachment #10
            9: begin
              ParamByName('Mail_AttachmentName10').AsString := sfn10;
              ParamByName('Mail_Attachment10').SetBlobData(ms10.Memory, ms10.Size);
            end;
          End;
        End;

        ExecSQL;
      End;
    Except
      On E:Exception Do
      Begin
        fnDisplayMyActionBox('ERR', 'MS SQL Error', 'Could not insert Record into Mail Table!', E.Message, EmptyStr, EmptyStr, True);
      End;
    End;
  Finally
    For i := 0 To lstbox_Attachments.Count -1 Do
    Begin
      Case i of
        0: begin
          If (ms1 <> Nil) Then ms1.Free;
          sfn1 := EmptyStr;
        end;
        1: begin
          If (ms2 <> Nil) Then ms2.Free;
          sfn2 := EmptyStr;
        end;
        2: begin
          If (ms3 <> Nil) Then ms3.Free;
          sfn3 := EmptyStr;
        end;
        3: begin
          If (ms4 <> Nil) Then ms4.Free;
          sfn4 := EmptyStr;
        end;
        4: begin
          If (ms5 <> Nil) Then ms5.Free;
          sfn5 := EmptyStr;
        end;
        5: begin
          If (ms6 <> Nil) Then ms6.Free;
          sfn6 := EmptyStr;
        end;
        6: begin
          If (ms7 <> Nil) Then ms7.Free;
          sfn7 := EmptyStr;
        end;
        7: begin
          If (ms8 <> Nil) Then ms8.Free;
          sfn8 := EmptyStr;
        end;
        8: begin
          If (ms9 <> Nil) Then ms9.Free;
          sfn9 := EmptyStr;
        end;
        9: begin
          If (ms10 <> Nil) Then ms10.Free;
          sfn10 := EmptyStr;
        end;
      End;
    End;
  End;
In der ListBox lstbox_attachments befindet sich der Pfad inkl. Dateinamen zu den Attachments...
Der jeweilige MemoryStream ist auch befüllt (im Debug habe ich die Size überprüft, diese ist > 0)...
Überseh ich hier grad nen Fehler oder warum bekomm ich immer die Fehlermeldung Invalid class Typecast
Ein Programmierer Programmiert durchschnittlich 15 Code Zeilen pro Tag
Wir sind hier doch nicht bei SAP!!!

Aber wir habens bald
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