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This is a discussion on Files within the C++ Programming forums, part of the General Programming Boards category; Hi, i'm after reading a block of data from a file which is in binary, and copying the data to ...

  1. #1
    Registered User subdene's Avatar
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    Files

    Hi, i'm after reading a block of data from a file which is in binary, and copying the data to a structure. The struture is exactly alligned to match the data within the file. Could anyone advise us on the type of function to use.... Thanks.
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    Confused Magos's Avatar
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    Since it's C++ and it's a binary file: ifstream::read()

    Code:
    STRUCTURE MyStructure;
    
    ifstream ReadFile;
    ReadFile.open("MyFile.dat", ios::in | ios::binary);
    
    if(!ReadFile.fail())
    {
       ReadFile.read((char*)&MyStructure, sizeof(STRUCTURE));
       ReadFile.close();
    }
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    Registered User subdene's Avatar
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    right that looks great thanks, why the typecasting to a char pointer though?
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  4. #4
    Confused Magos's Avatar
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    Originally posted by subdene
    right that looks great thanks, why the typecasting to a char pointer though?
    Since the ifstream class have no idea what datatypes you may have created, the only type it supports to read/write are char. Probably beacuse one char is 1 byte (most of the time at least).
    Otherwise you had to overload the read function yourself for every datatype you have made.
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  5. #5
    Registered User subdene's Avatar
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    right ok thanks.
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    Registered User subdene's Avatar
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    Magos, i've implemented the code, but all i get in the structure is garbage.... any ideas? Binary file is ok.... can't see what it could be.
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    Registered User foniks munkee's Avatar
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    Post some code.
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  8. #8
    Registered User subdene's Avatar
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    all right got it sorted now thanks, i was reading too far into the binary file.
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