c++ - Cannot kill Qt thread with CryptoPP FileSink running in the thread run method -


i have ui app in c++ , qt5.4, im using cryptopp 5.6.2 encrypt files. ran following problem:

  1. when encrypt button hit, new thread started based on this tutorial.

    // new thread cryptoworkerthread = new qthread; this->worker = new cryptoworker(filename.c_str(), newfilename.c_str(), key, keylength, iv); this->worker->movetothread(cryptoworkerthread); connect(worker, signal(error(qstring)), this, slot(errorstring(qstring))); connect(cryptoworkerthread, signal(started()), worker, slot(process())); connect(worker, signal(finished()), cryptoworkerthread, slot(quit())); connect(worker, signal(finished()), this, slot(on_cryptoworker_finished())); connect(worker, signal(finished()), worker, slot(deletelater())); connect(cryptoworkerthread, signal(finished()), cryptoworkerthread, slot(deletelater())); cryptoworkerthread->start();

  2. i store pointer thread , worker in mainwindow class (parent of encrypt button , slot)

    worker class:

    class cryptoworker : public qobject {     q_object public:     cryptoworker(const char* sourcefilename, const char* destfilename, const byte * key, int keylength, const byte * iv);     ~cryptoworker();      const char* sourcefilename;     const char* destfilename;      public slots:     void process();  signals:     void finished();     void error(qstring err);  private:     // add variables here     const byte* key;     const byte* iv;     int keylength; };  cryptoworker::cryptoworker(const char* sourcefilename, const char* destfilename, const byte * key, int keylength, const byte * iv){     this->sourcefilename = sourcefilename;     this->destfilename = destfilename;     this->key = key;     this->keylength = keylength;     this->iv = iv; }  cryptoworker::~cryptoworker(){  }  void cryptoworker::process(){      cryptopp::cbc_mode<cryptopp::aes>::encryption encryptor(key, keylength, iv);       cryptopp::filesource(sourcefilename, true,         new cryptopp::streamtransformationfilter(             encryptor,             new cryptopp::filesink(destfilename),             cryptopp::blockpaddingschemedef::pkcs_padding         ),         true // streamtransformationfilter     ); // filesource      emit finished();      return; }

now, when thread run , encrypting file file b on fly, using function:

cryptopp::filesource(sourcefilename, true,         new cryptopp::streamtransformationfilter(             encryptor,             new cryptopp::filesink(destfilename),             cryptopp::blockpaddingschemedef::pkcs_padding         ),         true // streamtransformationfilter ); // filesource

but, thread stuck until file finishes encoding , writing, can take few minutes. have no way kill thread, there no place put isalive() check.

i trying find solution allow me use filesource, filesink (speed compared fstream or file or qfile amazing) , let me cancel operation @ point.

i solved progress monitoring adding thread checks size of new being created encrypted file b, cool have control on bytes being written @ given moment (so can check isalive() , increment data counters).

at point stuck , cannot find solution. please help.

you try passing false second parameter (pumpall) of filesource constructor , doing work in loop in chunks using pump method - should allow check isalive , increment counters.


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