Hi Louis,
despite some of the wrong hints we gave you, WHAT was the error. Not
just for curiosity, but if I fall
into the same pit, I'd like to know what to do. 
 
Well, the declaration of the function in the app had a parameter
missing, thus, in the main app it looked as follows:
 
function GenerateReport(ADOConnection: TADOConnection; Format:
TReportFormat;
      ParamList: TStringList;var ErrList: TStringList; BitmapFileName:
String): String; external 'INV001.dll';
 
Whilst in the DLL it looked as follows:
 
function GenerateReport(ADOConnection: TADOConnection; Format:
TReportFormat;
      ParamList: TStringList; var ErrList: TStringList; BitMapFileName:
String; const bCopy: Boolean = false): String;
 
Cheers
Louis


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