Not able to use this C++ library in D

rnd via Digitalmars-d-learn Wed, 05 Jun 2019 21:11:23 -0700

I am trying to use C++ DCMTK library ( https://dcmtk.org/ )functions in D.A relevant reference page ishttps://support.dcmtk.org/docs/classDcmFileFormat.html#details

Following is C++ code modified fromhttps://stackoverflow.com/questions/5052148/how-to-use-dcmtk-in-qt


#include "dcmtk/dcmdata/dctk.h"
#include <iostream>
using namespace std;

int main() {
   DcmFileFormat fileformat;
   OFCondition status = fileformat.loadFile("test.dcm");
   if (status.good())   {
                cout << "File loaded" << endl;
   }else{

cerr << "Error: cannot read DICOM file (" << status.text()<< ")" << endl;

   }
   return 0;
}


I have tried to do the same in D with following code:

import std.stdio;
extern (C++) void loadFile(FILE *infile);
extern (C++) class DcmFileFormat;
extern (C++) class OFCondition;

void main(){
   DcmFileFormat fileformat;
   OFCondition status = fileformat.loadFile("test.dcm");
   if (status.good())   {
                writeln("File loaded");
   }else{

writeln("Error: cannot read DICOM file (", status.text(),")");

   }
}

However, I am getting following errors:

$ dmd dcmtk_eg.d

dcmtk_eg.d(5): Error: class `dcmtk_eg.DcmFileFormat` is forwardreferenced when looking for loadFiledcmtk_eg.d(5): Error: class `dcmtk_eg.DcmFileFormat` is forwardreferenced when looking for loadFiledcmtk_eg.d(5): Error: class `dcmtk_eg.DcmFileFormat` is forwardreferenced when looking for opDotdcmtk_eg.d(5): Error: class `dcmtk_eg.DcmFileFormat` is forwardreferenced when looking for opDispatchdcmtk_eg.d(10): Error: functiondcmtk_eg.loadFile(shared(_IO_FILE)* infile) is not callable usingargument types (DcmFileFormat, string)dcmtk_eg.d(10): cannot pass argument fileformat of typedcmtk_eg.DcmFileFormat to parameter shared(_IO_FILE)* infiledcmtk_eg.d(6): Error: class `dcmtk_eg.OFCondition` is forwardreferenced when looking for gooddcmtk_eg.d(6): Error: class `dcmtk_eg.OFCondition` is forwardreferenced when looking for gooddcmtk_eg.d(6): Error: class `dcmtk_eg.OFCondition` is forwardreferenced when looking for opDotdcmtk_eg.d(6): Error: class `dcmtk_eg.OFCondition` is forwardreferenced when looking for opDispatchdcmtk_eg.d(6): Error: class `dcmtk_eg.OFCondition` is forwardreferenced when looking for gooddcmtk_eg.d(6): Error: class `dcmtk_eg.OFCondition` is forwardreferenced when looking for gooddcmtk_eg.d(6): Error: class `dcmtk_eg.OFCondition` is forwardreferenced when looking for gooddcmtk_eg.d(6): Error: class `dcmtk_eg.OFCondition` is forwardreferenced when looking for gooddcmtk_eg.d(6): Error: class `dcmtk_eg.OFCondition` is forwardreferenced when looking for gooddcmtk_eg.d(6): Error: class `dcmtk_eg.OFCondition` is forwardreferenced when looking for moddcmtk_eg.d(6): Error: class `dcmtk_eg.OFCondition` is forwardreferenced when looking for gooddcmtk_eg.d(6): Error: class `dcmtk_eg.OFCondition` is forwardreferenced when looking for gooddcmtk_eg.d(6): Error: class `dcmtk_eg.OFCondition` is forwardreferenced when looking for gooddcmtk_eg.d(6): Error: class `dcmtk_eg.OFCondition` is forwardreferenced when looking for gooddcmtk_eg.d(6): Error: class `dcmtk_eg.OFCondition` is forwardreferenced when looking for good

Where is the problem and how can it be solved? Thanks for yourhelp.

Not able to use this C++ library in D

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