Thread: VC++ Sort File

// this is my union......
union URec {
structA astruct; //union cont. 3 structs
structB bstruct;
structC cstruct;
};
union URec Data;

// The unions are held on a binary file and require reading into an array to be sorted before being written to a text file. The arrays are sorted in ascending order of the the second field of each structure.
I have used the following code to try to achieve this but I am not sure about how to sort the array or how to write it to the text file.
Any help, ideas or criticism(constructive) would be hugely appreciated.

infile.seekp(0, ios::end);
totnum = infile.tellg(); // No. of bytes in file
elements = totnum / sizeof(Data); //No of unions in file
URec *code_ptr;
code_ptr = new URec [elements]; //assign new memory
// read unions into array
infile.read((char *)code_ptr,sizeof(elements * sizeof(Data)));

// start sorting ????????????

Are you allowed to use a standard library sort function?

Does your text file have to be human readable? If so you'll have to write each element of whatever structure has been read separately using something like operator <<.