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dhanyu

READ/WRITE to a file GLDouble

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Hi all, Dose anybody knows how to write from GLDOUBLE variable to a text file and read it back to a GLDOUBLE variable. Since this is 64-bit value ... I doubt that c++ libraries could help. thank you

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In ascii (expect some loss of precision unless you set the format flags appropriately):
GLdouble writeMyDouble = 3.14159265358979323846;
GLdouble readMyDouble;
{
std::ofstream writer("my_ascii_file.txt");
writer << writeMyDouble;
}
{
std::ifstream reader("my_ascii_file.txt");
reader >> readMyDouble;
}
std::cout << writeMyDouble << '\n' << readMyDouble << '\n';

In binary (no loss of precision):
GLdouble writeMyDouble = 3.14159265358979323846;
GLdouble readMyDouble;
{
std::ofstream writer("my_ascii_file.txt", std::ios::binary);
writer.write(reinterpret_cast< char * >(&writeMyDouble), sizeof(writeMyDouble));
}
{
std::ifstream reader("my_ascii_file.txt");
reader.read(reinterpret_cast< char * >(&readMyDouble), sizeof(readMyDouble));
}
std::cout << writeMyDouble << '\n' << readMyDouble << '\n';


Enigma

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