> chunhsia_t...@mazak.co.jp wrote on 19 Juli 2017 at 10:04:
>
> Dear Sir / Madam,
>
> want to set pdf password.
>
> tried: -
>
> PdfEncrypt* pEncrypt = PdfEncrypt::CreatePdfEncrypt("user", "owner");
> PdfEncrypt* pEncrypt = PdfEncrypt::CreatePdfEncrypt("", "");
> PdfEncrypt* pEncrypt = PdfEncrypt::CreatePdfEncrypt("user", "owner",
> 0, PdfEncrypt::ePdfEncryptAlgorithm_RC4V1, PdfEncrypt::ePdfKeyLength_40);
> PdfEncrypt* pEncrypt = PdfEncrypt::CreatePdfEncrypt("user", "owner",
> 3900, PdfEncrypt::ePdfEncryptAlgorithm_RC4V1, PdfEncrypt::ePdfKeyLength_40);
>
Hi all,
it shouldn't be necessary to create a PdfEncrypt object yourself
if you are using PdfMemDocument. In that case, just use the
SetEncrypted method of your PdfMemDocument (give it the same
arguments as CreatePdfEncrypt).
Otherwise, delete the object as soon as you've given it to the
PdfStreamedDocument constructor (as the latter does copy it for
its use) to avoid the object taking up memory while it's unused.
Don't do this when using PdfMemDocument as this will own the
PdfEncrypt object passed to its SetEncrypted() method (so it'll
get deleted automatically when the document is deleted, before
that it's still needed).
I advise to not not write the permissions as a number, but use
the symbolic constants and the bitwise-or operator | to combine
them (though this latter is probably not directly related, but
good advice for maintainability).
> but all has run time error:
>
> Unhandled exception at 0x75D5845D in PDF.exe: Microsoft C++ exception:
> std::bad_alloc at memory location 0x002FDE8C.
>
> Please advice.
>
> With regards,
> Tang
The exception std::bad_alloc is thrown when not enough
memory is available, which can happen if you call CreatePdfEncrypt
in a loop some high number of times without deleting the objects
after giving them to the PdfStreamedDocument constructor.
I hope this helps.
Best regards,
Matthew Brincke
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