我需要将一些从Wt文件上传小部件上传的文本文件作为参数传递给某些C函数来处理它们的数据。除非我真的找不到使用假脱机文件名（从std :: string转换为char *）打开文件的正确方法作为第一个fopen（）的参数，我意识到我还没有理解Wt提供的文件处理方法。即，存储假脱机文件的位置？我在文件上传完成后尝试使用std::string WtFileUpload::spoolFileName() const（当进度条到达结尾时我提供了一个点击按钮），但是通过挖掘errno编号，我发现该文件不存在。
请给我一个正确的方法继续这个（如果可以的话，提供一些代码）并帮助我理解Wt处理用这个小部件上传的文件的方式。
提前致谢。
更新：我的文件上传和处理代码：
//Declared in the application class:
Wt::WFileUpload *RORUpload;
Wt::WPushButton *RORUploadButton;
//Create file upload widget and add handlers for it in application constructor:
root()->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->setFileTextSize(40);
root()->addWidget(new Wt::WText("RINEX Rover Observation Data "));
new Wt::WBreak(root());
RORUploadButton = new Wt::WPushButton("Upload", root());
root()->addWidget(RORUpload);
//Upload when the button is clicked.
RORUploadButton->clicked().connect(RORUpload, &Wt::WFileUpload::upload);
RORUploadButton->clicked().connect(RORUploadButton, &Wt::WPushButton::disable);
// Upload automatically when the user entered a file.
RORUpload->changed().connect(RORUpload, &Wt::WFileUpload::upload); // !!! do not rename this 'upload'
RORUpload->changed().connect(RORUploadButton, &Wt::WPushButton::disable);
// React to a succesfull upload.
RORUpload->uploaded().connect(RORUpload, (Wt::WObject::Method) &Wt::WFileUpload::uploaded);
//React to a fileupload problem.
RORUpload->fileTooLarge().connect(RORUpload, (Wt::WObject::Method) &Wt::WFileUpload::fileTooLarge);
//When user presses a "submit" button, a connection function will be called.
const std::string Nameofror = RORUpload->spoolFileName();
const char *CNameofror = Nameofror.c_str();
我想知道问题是否与我的（Wt :: WObjectMethod）演员有关。 编辑：请参阅我对此问题的评论。
更新2 ：忘记说我点击“提交”按钮后程序崩溃了 代码：
//Create button into application constructor:
SubmitButton = new Wt::WPushButton("Submit", root());
SubmitButton->clicked().connect(SubmitButton, &Wt::WPushButton::disable);
SubmitButton->clicked().connect(this, &GOPApplication::definedOptions);
//definedOptions:
void GOPApplication::definedOptions()
{
int Posmode = PTGroup->checkedId(); //Value selection from PTContainer (checked radio button id).
//int singlemoving; //Value selection from SPContainer (checked radio button id).
int Frequencies = FGroup->checkedId(); //Value selection from FContainer (checked radio button id).
const Wt::WString WElmask = EMedit->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->checkedId(); //Value selection from HContainer (checked radio button id).
int Soltype = STGroup->checkedId(); //Value selection from STContainer (checked radio button id).
int Sateph = SAGroup->checkedId(); //Value selection from SEContainer (checked radio button id).
int Basestatcoord = BSCGroup->checkedId(); //Value selection from BSCContainer (checked radio button id).
int Ionerror = IEGroup->checkedId(); //Value selection from IEContainer (checked radio button id).
int Troperror = TEGroup->checkedId(); //Value selection from TEContainer (checked radio button id).
int Receiverapcpvc = RAGroup->checkedId(); //Value selection from RAContainer (checked radio button id).
int Satelliteapvc = SAGroup->checkedId(); //Value selection from SAContainer (checked radio button id).
int Earthtidescorr = ETCGroup->checkedId(); //Value selection from ETCContainer (checked radio button id).
int Ambresstr = STRGroup->checkedId(); //Value selection from STRContainer (checked radio button id).
const Wt::WString WMinlockcount = MLCedit->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->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->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->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->checkedId(); //Value selection from STSContainer (checked radio button id).
int Outputresiduals = ORGroup->checkedId(); //Value selection from ORContainer (checked radio button id).
int Settimeformat = STFGroup->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->spoolFileName();
const char *CNameofror = Nameofror.c_str();
printf("\n\n============= %s =============\n\n", CNameofror);
//const std::string Nameofrob = ROBUpload->spoolFileName();
//const char *CNameofrob = Nameofrob.c_str();
//const std::string Nameofrn = RNUpload->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);
}
答案 0 :(得分：2)
您是否确定文件上传过程已完成？如果它是真的，那么只有在收到信号WFileUpload::uploaded()或WFileUpload::fileTooLarge()之后才应该尝试使用文件。请检查一下。
答案 1 :(得分：0)
如果您使用功能FileIsLoad（）连接上传的信号，并且您的Wt :: WFileUpload对象为Upload
void MyClass::FileIsLoad ( void )
{
auto Res = std::make_shared<Wt::WFileResource>(
Upload->uploadedFiles()[0].contentType() ,
Upload->uploadedFiles()[0].spoolFileName() ) ;
string MyFile = string("\mydirectory\" ) +
Upload->uploadedFiles()[0].clientFileName( ) ;
std::ofstream Stream ( MyFile ,
std::ios::out |
std::ios::binary |
std::ios::trunc ) ;
Res->write ( Stream ) ;
Stream.close ( ) ;
}
上传文件将以与原始文件相同的名称保存在\ my目录中。