On Wednesday, May 7, 2014 7:00:46 AM UTC-4, Jo Win wrote:
>
> Hello,
>
> I would like to encrypt multiple files and put them all together in one
> file. So I create an Object of type FileSink and I would like to use a code
> like
>
> CryptoPP::FileSink *file = new CryptoPP::FileSink("/path/to/my/file");
>
> std::string str1;
> std::string str2;
> str1.append("hi ");
> str2.append("how are you");
>
> CryptoPP::StringSource(str1,true, file);
> CryptoPP::StringSource(str2,true, file); //crash
>
'file' is deleted after the the first StringSource's destructor runs. When
the second StringSink attempts to use 'file', its no longer a valid object.
Try:
CryptoPP::FileSink file("/path/to/my/file");
std::string str1;
std::string str2;
str1.append("hi ");
str2.append("how are you");
CryptoPP::StringSource ss1(str1,true, new CryptoPP::Redirector(file));
CryptoPP::StringSource ss2(str2,true, new CryptoPP::Redirector(file));
With the code above, the Redirector stops the ownership chain, so the
StringSource will *not* delete the attached transformation (in this case,
the FileSink). The FileSink will be cleaned up when the function exits
since its an automatic (stack) variable.
Jeff
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