(TBarcode2D_PDF417)
Returns the check sum of a barcode text that will be encoded into each symbol in a Macro PDF417 set. The value will be used in the macro PDF417 control information block, and the macro PDF417 control information block will be used by each symbol in the Macro PDF417 set. There are two different overloading methods, Syntax 1, and Syntax 2 (only for Delphi/C++Builder 2009 or later):
Syntax 1: Returns the check sum value of a barcode text. The barcode text is specified in the Barcode parameter. It is of type string.
For Delphi/C++ Builder 2007 or early, the Barcode parameter is in fact an AnsiString. By default, it is an ANSI encoding string, if you want to use other encoding scheme (for example the UTF-8, UTF-16), please convert it in the OnEncode event, or specify the converted string in the Barcode parameter. Also you can use the method to caculate the check sum of a block of binary (bytes) data.
For Delphi/C++ Builder 2009 or later, it is in fact a UnicodeString instead of AnsiString. By default, the unicode string will be converted to an ANSI encoding string, then caculate its check sum. If you want to use other encoding scheme (for example the UTF-8, UTF-16), please convert it in the OnEncode event, or use the GetCheckSum (Syntax 2) overloading method and specify the converted string in its Data parameter. If you want to caculate the check sum of a block of binary (bytes) data, please use the GetCheckSum (Syntax 2) overloading method.
Syntax 2: Returns the check sum value of a barcode text. The barcode text is specified in the Data parameter. It is of type AnsiString. The method is available only for the Delphi/C++ Builder 2009 or later.
For the Delphi/C++ Builder 2009 or later, you can use the method to caculate the check sum of a block of binary (bytes) data. Or specifies the barcode text in AnsiString format.
If you want to caculate the check sum of a block of binary (bytes) data under Delphi/C++ Builder 2007 or early, please use the GetCheckSum (Syntax 1) overloading method.
See also the "Macro PDF417" section in the "TBarcode2D_PDF417" article.