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POHow to pass a spooled file, uploaded from a file upload widget, to a C FILE *f pointer
 

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  1. POHow to pass a spooled file, uploaded from a file upload widget, to a C FILE *f pointer
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    <p>I need to pass some text files, uploaded from a Wt file upload widget, as arguments to some C function for processing their data. Unless that I really can't find a proper way to open a file using the spooled file name (converted from std::string to a char *) as the first fopen()'s argument, I realized that I have not understood the file handling methods provided by Wt. I.e., where a spooled file is stored?. I tried to use <code>std::string WtFileUpload::spoolFileName() const</code> just after the file upload is finished (I provide a button to be clicked when the progress bar reaches the end), but by digging the errno number, I found that the file didn't exists.</p> <p>Please, suggest me a proper way to proceed on this (provide some code if you can) and help me to understand the way Wt handles files uploaded with this widget.</p> <p>Thanks in advance.</p> <p><strong>UPDATE</strong>: My file upload and handling code:</p> <pre><code>//Declared in the application class: Wt::WFileUpload *RORUpload; Wt::WPushButton *RORUploadButton; //Create file upload widget and add handlers for it in application constructor: root()-&gt;addWidget(new Wt::WText("RINEX File Loaders ")); new Wt::WBreak(root()); //RINEX observation data file from rover station uploader. new Wt::WBreak(root()); RORUpload = new Wt::WFileUpload(); RORUpload-&gt;setFileTextSize(40); root()-&gt;addWidget(new Wt::WText("RINEX Rover Observation Data ")); new Wt::WBreak(root()); RORUploadButton = new Wt::WPushButton("Upload", root()); root()-&gt;addWidget(RORUpload); //Upload when the button is clicked. RORUploadButton-&gt;clicked().connect(RORUpload, &amp;Wt::WFileUpload::upload); RORUploadButton-&gt;clicked().connect(RORUploadButton, &amp;Wt::WPushButton::disable); // Upload automatically when the user entered a file. RORUpload-&gt;changed().connect(RORUpload, &amp;Wt::WFileUpload::upload); // !!! do not rename this 'upload' RORUpload-&gt;changed().connect(RORUploadButton, &amp;Wt::WPushButton::disable); // React to a succesfull upload. RORUpload-&gt;uploaded().connect(RORUpload, (Wt::WObject::Method) &amp;Wt::WFileUpload::uploaded); //React to a fileupload problem. RORUpload-&gt;fileTooLarge().connect(RORUpload, (Wt::WObject::Method) &amp;Wt::WFileUpload::fileTooLarge); //When user presses a "submit" button, a connection function will be called. const std::string Nameofror = RORUpload-&gt;spoolFileName(); const char *CNameofror = Nameofror.c_str(); </code></pre> <p>I wonder if the problem is related with my (Wt::WObjectMethod) cast. <strong>EDIT</strong>: See my comment on this question.</p> <p><strong>UPDATE 2</strong>: Forgot to say that i get a program crash when I click the "submit" button Code for this:</p> <pre><code>//Create button into application constructor: SubmitButton = new Wt::WPushButton("Submit", root()); SubmitButton-&gt;clicked().connect(SubmitButton, &amp;Wt::WPushButton::disable); SubmitButton-&gt;clicked().connect(this, &amp;GOPApplication::definedOptions); //definedOptions: void GOPApplication::definedOptions() { int Posmode = PTGroup-&gt;checkedId(); //Value selection from PTContainer (checked radio button id). //int singlemoving; //Value selection from SPContainer (checked radio button id). int Frequencies = FGroup-&gt;checkedId(); //Value selection from FContainer (checked radio button id). const Wt::WString WElmask = EMedit-&gt;text(); //Value selection from EMw (given number). std::string SElmask = WElmask.narrow(); //Value selection from EMw (given number). const char *CElmask = SElmask.c_str(); //Value selection from EMw (given number). float Elmask = atof(CElmask); //Value selection from EMw (given number). int Height = HGroup-&gt;checkedId(); //Value selection from HContainer (checked radio button id). int Soltype = STGroup-&gt;checkedId(); //Value selection from STContainer (checked radio button id). int Sateph = SAGroup-&gt;checkedId(); //Value selection from SEContainer (checked radio button id). int Basestatcoord = BSCGroup-&gt;checkedId(); //Value selection from BSCContainer (checked radio button id). int Ionerror = IEGroup-&gt;checkedId(); //Value selection from IEContainer (checked radio button id). int Troperror = TEGroup-&gt;checkedId(); //Value selection from TEContainer (checked radio button id). int Receiverapcpvc = RAGroup-&gt;checkedId(); //Value selection from RAContainer (checked radio button id). int Satelliteapvc = SAGroup-&gt;checkedId(); //Value selection from SAContainer (checked radio button id). int Earthtidescorr = ETCGroup-&gt;checkedId(); //Value selection from ETCContainer (checked radio button id). int Ambresstr = STRGroup-&gt;checkedId(); //Value selection from STRContainer (checked radio button id). const Wt::WString WMinlockcount = MLCedit-&gt;text(); //Value selection from MLCw (given number). std::string SMinlockcount = WMinlockcount.narrow(); //Value selection from MLCw (given number). const char *CMinlockcount = SMinlockcount.c_str(); //Value selection from MLCw (given number). float Minlockcount = atof(CMinlockcount); //Value selection from MLCw (given number). const Wt::WString WMinfixcount = MFCedit-&gt;text(); //Value selection from MFCw (given number). std::string SMinfixcount = WMinfixcount.narrow(); //Value selection from MFCw (given number). const char *CMinfixcount = SMinfixcount.c_str(); //Value selection from MFCw (given number). float Minfixcount = atof(CMinfixcount); //Value selection from MFCw (given number) const Wt::WString WThreshold = Tedit-&gt;text(); //Value selection from Tw (given number). std::string SThreshold = WThreshold.narrow(); //Value selection from Tw (given number). const char *CThreshold = SThreshold.c_str(); //Value selection from Tw (given number). float Threshold = atof(CThreshold); //Value selection from Tw (given number). const Wt::WString WMinelevangle = MEAedit-&gt;text(); //Value selection from MEAw (given number). std::string SMinelevangle = WMinelevangle.narrow(); //Value selection from Tw (given number). const char *CMinelevangle = SMinelevangle.c_str(); //Value selection from Tw (given number). float Minelevangle = atof(CMinelevangle); //Value selection from Tw (given number). int Settimesystem = STSGroup-&gt;checkedId(); //Value selection from STSContainer (checked radio button id). int Outputresiduals = ORGroup-&gt;checkedId(); //Value selection from ORContainer (checked radio button id). int Settimeformat = STFGroup-&gt;checkedId(); //Value selection from STFContainer (checked radio button id). //What about RINEX files obtaining? //Maybe... (see notebook for infos about spoolFileName() usage) const std::string Nameofror = RORUpload-&gt;spoolFileName(); const char *CNameofror = Nameofror.c_str(); printf("\n\n============= %s =============\n\n", CNameofror); //const std::string Nameofrob = ROBUpload-&gt;spoolFileName(); //const char *CNameofrob = Nameofrob.c_str(); //const std::string Nameofrn = RNUpload-&gt;spoolFileName(); //const char *CNameofrn = Nameofrn.c_str(); //post-processing(Posmode,Frequencies,Elmask,Height,Soltype,Sateph,Basestatcoord,Ionerror,Troperror,Receiverapcpvc, // Satelliteapvc,Earthtidescor,Ambresstr,Minlockcount,Minfixcount,Threshold,Minelevangle,Settimesystem,Outputresiduals,Settimeformat); } </code></pre>
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    1. COMy fear seem to be assured. Error springs from my misunderstanding of `RORUpload->uploaded().connect(RORUpload, (Wt::WObject::Method) &Wt::WFileUpload::uploaded);` operation. Second argument of `connect()` must be a signal handler of my own implementation, which handles the `uploaded` signal. Same goes to `fileTooLarge()`.
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      1. POHow to pass a spooled file, uploaded from a file upload widget, to a C FILE *f pointer
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