[yunqa.de] Re: DIXML: Problem with % in tag tribute
- From: Delphi Inspiration <delphi@xxxxxxxx>
- To: yunqa@xxxxxxxxxxxxx
- Date: Sat, 16 Jun 2012 12:45:25 +0200
On 15.06.2012 17:43, Robert Arlavi wrote:
> field_value8:=UTF8Encode('5% - 95');
> xmlTextWriterWriteFormatAttribute(Writer,PAnsiChar(field_name8),PAnsiChar(field_value8));
>
xmlTextWriterWriteFormatAttribute expects a string with format specifiers
similar to C printf() (see http://en.wikipedia.org/wiki/Printf_format_string).
This means that the '%' has a special meaning. To output a literal '%' you must
double it: '%%'. You can output strings and decimal numbers using %s and %d.
Here is an example from my DUnit test suite:
var
Buf: xmlBufferPtr;
pName, pValue, pArg: C_char_ptr;
nArg: C_int;
Writer: xmlTextWriterPtr;
begin
Buf := xmlBufferCreate;
Writer := xmlNewTextWriterMemory(Buf, 0);
xmlTextWriterStartDocument(Writer, nil, 'UTF-8', nil);
pName := 'Element';
xmlTextWriterStartElement(Writer, pName);
pName := 'Attribute';
pValue := '%% %s %d';
pArg := 'Arg';
nArg := 98765;
xmlTextWriterWriteFormatAttribute(Writer, pName, pValue, pArg, nArg);
xmlTextWriterEndElement(Writer);
xmlTextWriterEndDocument(Writer);
CheckEquals(
'<?xml version="1.0" encoding="UTF-8"?>' + #$A +
'<Element Attribute="% Arg 98765"/>' + #$A,
Buf.Content);
xmlFreeTextWriter(Writer);
xmlBufferFree(Buf);
end;
If you don't need the formatting functionality, use
xmlTextWriterWriteAttribute() instead:
function xmlTextWriterWriteAttribute(
Writer: xmlTextWriterPtr;
const Name: xmlCharPtr;
const Content: xmlCharPtr): C_int;
Ralf
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