Problem with "sum" formula in FastReport VCL 5 using C++Builder.

Comments

• gpi

  October 2014 edited 10:18PM

  Use
  
  totals->Text = "Totals: [Sum(<ClientDataSet1.\"volume\">, DataBand, 1)]";
• MrSnrub

  October 2014 edited 10:18PM

  That also didn't work. I am getting the same error. Here is my revised code:
  

  void __fastcall TfrFastReportsDemo::Button1Click(TObject *Sender)
  {
      // Create a simple dataset.
  
      ClientDataSet1->FieldDefs->Clear();
      ClientDataSet1->FieldDefs->Add("ID", ftInteger, 0, false);
      ClientDataSet1->FieldDefs->Add("Status", ftString, 10, false);
      ClientDataSet1->FieldDefs->Add("Created", ftDate, 0, false);
      ClientDataSet1->FieldDefs->Add("Volume", ftInteger, 0, false);
  
      try
      {
        ClientDataSet1->CreateDataSet();
      }
      catch(Exception& e)
      {
        ShowMessage("ERROR: '" + e.Message + "'");
        return;
      }
  
      ClientDataSet1->Open();
      for (int i = 0; i < 10; ++i)
      {
        ClientDataSet1->Append();
        ClientDataSet1->FieldByName("ID")->AsInteger = i;
        ClientDataSet1->FieldByName("Status")->AsString = "Code" + String(i);
        ClientDataSet1->FieldByName("Created")->AsDateTime = Now();
        ClientDataSet1->FieldByName("Volume")->AsInteger = Random(1000);
  
        try
        {
          ClientDataSet1->Post();
        }
        catch(Exception& e)
        {
          ShowMessage("ERROR: '" + e.Message + "'");
          ClientDataSet1->Close();
          return;
        }
      }
  
      // Dataset created successfully, now create Fast Report that outputs that dataset
  
      frxReport1->Clear();
      frxDBDataset1->DataSet = (TDataSet*)ClientDataSet1;
  
      frxReport1->DataSets->Add(frxDBDataset1);
  
      TfrxDataPage* DataPage = new TfrxDataPage(frxReport1);
      DataPage->CreateUniqueName();
  
      TfrxReportPage* Page = new TfrxReportPage(frxReport1);
      Page->CreateUniqueName();
  
      // set sizes of fields, paper and orientation to defaults
      Page->SetDefaults();
      Page->Orientation = poPortrait;
  
      TfrxReportTitle* HeaderBand = new TfrxReportTitle(Page);
      HeaderBand->CreateUniqueName();
      HeaderBand->Top = 0;
      HeaderBand->Height = 20;
  
      TfrxMemoView* Memo = new TfrxMemoView(HeaderBand);
      Memo->CreateUniqueName();
      Memo->Text = "Generic Report";
      Memo->SetBounds(0, 0, 200, 20);
  
      TfrxHeader* ColumnHeaderBand;
      ColumnHeaderBand = new TfrxHeader(Page);
      ColumnHeaderBand->CreateUniqueName();
      ColumnHeaderBand->Top = HeaderBand->Top + HeaderBand->Height;
      ColumnHeaderBand->Height = 20;
  
      TfrxMasterData* DataBand = new TfrxMasterData(Page);
      DataBand->Name = "DataBand";
      DataBand->DataSet = frxDBDataset1;
      DataBand->Top = ColumnHeaderBand->Top + ColumnHeaderBand->Height;
      DataBand->Height = 20;
  
      TfrxMemoView* mField;
      for (int i = 0; i < DataBand->DataSet->FieldsCount(); ++i)
      {
        const String fieldname = ClientDataSet1->Fields->Fields[i]->FieldName;
  
        mField = new TfrxMemoView(ColumnHeaderBand);
        mField->CreateUniqueName();
        mField->SetBounds(i * 100, 0, 100, 20);
        mField->Text = fieldname;
        mField->HAlign = haCenter;
  
        // Now do the actual data
        mField = new TfrxMemoView(DataBand);
        mField->CreateUniqueName();
        mField->DataSet = DataBand->DataSet;
        mField->DataField = fieldname;
        mField->SetBounds(i * 100, 0, 100, 20);
        mField->HAlign = haRight;
      }
  
      // Now do footer band. This will hold the total
      TfrxBand* FooterBand = new TfrxFooter(Page);
      FooterBand->CreateUniqueName();
      FooterBand->Top = DataBand->Top + DataBand->Height;
      FooterBand->Height = HeaderBand->Height;
  
      TfrxMemoView* totals = new TfrxMemoView(FooterBand);
      totals->Top = 0;
      totals->Left = 0;
      totals->Height = 20;
      totals->Align = baWidth;
  
      bool is_error = false;
      try
      {
        // Create a summation function that displays the volume total
        totals->Text = "Totals: [Sum(<ClientDataSet1.\"Volume\">, DataBand, 1)]";
      }
      catch(Exception& e)
      {
        ShowMessage("ERROR: '" + e.Message + "'");
        is_error = true;
      }
  
      if (!is_error)
      {
        frxReport1->ShowReport(true);
      }
  
      ClientDataSet1->Close();
  
      ShowMessage("Program complete!");
    return;
  }