seekpos always returns -1

[petervn]

I am evaluating the StreamConverter class for converting UTF-8 encoded file into UTF-16. The conversion itself works fine, but I ran into problem trying to get a current stream position. The position returned with tellg() turned out to be invalid (-1). tellg() invokes streambuf::pubseekoff() which calls a virtual function streambuf::seekoff. The StreamConverter uses default implementation of seekof which always returns an invalid position. Is this a implementation bug in the StreamConverter ?

[petervn]

Anyone?

[guenter]

In POCO, only File*Stream classes support seek operations. For all other streams seek operations will fail as they are not implemented. In the case of StreamConverter, you can try a seek operation on the underlying stream (the one you pass in the constructor).