C / C ++和Fortran写入同一文件

Question

I have a C/C++ library whose functions are called inside a Fortran program. I would like to write some output generated in my library on the same file the Fortran program outputs to. I tried to pass the filename, open it in C++, write to it and finally close it with this sample code:

std::ofstream output;
output.open(name, ofstream::out | ofstream::app);

/*
   Some calculations...
 */    

output << "Result is " << result << std::endl;

output.close();

Nothing is written to file, unless I remove ofstream::app but then most part of what is written by the Fortran code is destroyed... I also tried using fprintf with a similar sample code:

FILE * pFile = fopen(name, "a");

 /*
   Some calculations...
 */    

fprintf(pFile, "Result is = %.10E", result);

fclose(pFile);

with the same results. Any clue as to how to do this?

Answer 1

即使您找到了针对一组运行时库执行此操作的方法，也可能因另一组（例如，不同的编译器集合）或另一个操作系统而失败...请不要这样做，请将您要写入的数据传递给最初打开文件的系统的一部分。