digitalmars.D.learn - Not able to use this C++ library in D
I am trying to use C++ DCMTK library ( https://dcmtk.org/ ) functions in D. A relevant reference page is https://support.dcmtk.org/docs/classDcmFileFormat.html#details Following is C++ code modified from https://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 forward referenced when looking for loadFile dcmtk_eg.d(5): Error: class `dcmtk_eg.DcmFileFormat` is forward referenced when looking for loadFile dcmtk_eg.d(5): Error: class `dcmtk_eg.DcmFileFormat` is forward referenced when looking for opDot dcmtk_eg.d(5): Error: class `dcmtk_eg.DcmFileFormat` is forward referenced when looking for opDispatch dcmtk_eg.d(10): Error: function dcmtk_eg.loadFile(shared(_IO_FILE)* infile) is not callable using argument types (DcmFileFormat, string) dcmtk_eg.d(10): cannot pass argument fileformat of type dcmtk_eg.DcmFileFormat to parameter shared(_IO_FILE)* infile dcmtk_eg.d(6): Error: class `dcmtk_eg.OFCondition` is forward referenced when looking for good dcmtk_eg.d(6): Error: class `dcmtk_eg.OFCondition` is forward referenced when looking for good dcmtk_eg.d(6): Error: class `dcmtk_eg.OFCondition` is forward referenced when looking for opDot dcmtk_eg.d(6): Error: class `dcmtk_eg.OFCondition` is forward referenced when looking for opDispatch dcmtk_eg.d(6): Error: class `dcmtk_eg.OFCondition` is forward referenced when looking for good dcmtk_eg.d(6): Error: class `dcmtk_eg.OFCondition` is forward referenced when looking for good dcmtk_eg.d(6): Error: class `dcmtk_eg.OFCondition` is forward referenced when looking for good dcmtk_eg.d(6): Error: class `dcmtk_eg.OFCondition` is forward referenced when looking for good dcmtk_eg.d(6): Error: class `dcmtk_eg.OFCondition` is forward referenced when looking for good dcmtk_eg.d(6): Error: class `dcmtk_eg.OFCondition` is forward referenced when looking for mod dcmtk_eg.d(6): Error: class `dcmtk_eg.OFCondition` is forward referenced when looking for good dcmtk_eg.d(6): Error: class `dcmtk_eg.OFCondition` is forward referenced when looking for good dcmtk_eg.d(6): Error: class `dcmtk_eg.OFCondition` is forward referenced when looking for good dcmtk_eg.d(6): Error: class `dcmtk_eg.OFCondition` is forward referenced when looking for good dcmtk_eg.d(6): Error: class `dcmtk_eg.OFCondition` is forward referenced when looking for good Where is the problem and how can it be solved? Thanks for your help.
Jun 05 2019
Kagamin <spam here.lot> You should declare methods too, see example https://dlang.org/spec/cpp_interface.html#using_cpp_classes_from_d
Jun 06 2019