dynamicCall and QByteArray - strange characters

[franco.amato]

How do you know it doesn't contain the data?

Because from a cmd line software written in C# calling the same routine with the same parameter, importing as reference such com object I can see this (debugging with visual studio):

"I??\0\0xml;q=0.Franco\0\0\0\0\0\0\0\0\0Amato \0\0 \0\0\0\0\0\0\0\0

\0\0\0\0AAAAAAAAAAAAAAA=0\0\n \n0987654321

`E?\"UF ??\fCQ????O\"D ?\v2??(E??\n2F?D?\fH1\b\vH???\nIae?.???(?`>?/?p<?;M???????:????\"
8??`:?!???PQ?\r??`'?`2 ??Q)\n??#3?????#34????\"34????\"34O???\"34O? ??\"#3D???#4D???
#4D???
#4D???
34D???
\"3DD? ??
#DDE???
4DTE???4UUEo??EUUUo???VffUo???ffff?? ?wwff????wwvg?\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0 \0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0 \0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0 \0\0\0\0\0\0\0\0\0"

And debugging the same routine but written in Qt I can not see nothing, only 4 characters.
It show the correct size ( 441 bytes ) but I can not see its content as in the case of C#. I also did

char* data = ba.data(); 
qDebug() <<  content of data; //<--pseudo code

char* data = ba.data(); 
qDebug() <<  content of data; //<--pseudo code

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but I even this way I can't see the data.