El método BitConverter.ToDouble() se usa para devolver un número de coma flotante de doble precisión convertido a partir de ocho bytes en una posición específica en una array de bytes.
Sintaxis:
public static double ToDouble (byte[] value, int startIndex);
Parámetros:
valor: Es una array de bytes.
startIndex: Es la posición inicial dentro del valor.
Valor devuelto: este método devuelve un número de punto flotante de doble precisión formado por ocho bytes que comienzan en startIndex.
Excepciones:
- ArgumentException: si startIndex es mayor o igual que la longitud del valor menos 7 y es menor o igual que la longitud del valor menos 1.
- ArgumentNullException: si el valor es nulo.
- ArgumentOutOfRangeException: si startIndex es menor que cero o mayor que la longitud del valor menos 1.
Los siguientes programas ilustran el uso del método BitConverter.ToDouble(Byte[], Int32) :
Ejemplo 1:
// C# program to demonstrate // BitConverter.ToDouble(Byte[], Int32) // Method using System; class GFG { // Main Method public static void Main() { try { // Define an array of byte values. byte[] bytes = {0,0,1,2,7,126,78,55, 255,78,45,198,200,1, 1,1,1,255,255,2,4,4, 77,77,77,77,77,0,1}; // Display the values of the myArr. Console.WriteLine("Initial Array: "); // calling the PrintIndexAndValues() // method to print PrintIndexAndValues(bytes); // print char value Console.WriteLine("index Array elements "+ " double values"); Console.WriteLine(); // getting double value and Display it for (int index = 0; index < bytes.Length - 7; index = index + 8) { double values = BitConverter.ToDouble(bytes, index); Console.WriteLine(" {0} {1} {2}", index, BitConverter.ToString(bytes, index, 8), values); } } catch (ArgumentNullException e) { Console.Write("Exception Thrown: "); Console.Write("{0}", e.GetType(), e.Message); } catch (ArgumentOutOfRangeException e) { Console.Write("Exception Thrown: "); Console.Write("{0}", e.GetType(), e.Message); } catch (ArgumentException e) { Console.Write("Exception Thrown: "); Console.Write("{0}", e.GetType(), e.Message); } } // Defining the method // PrintIndexAndValues public static void PrintIndexAndValues(byte[] myArr) { int count = 0; for (int i = 0; i < myArr.Length; i++) { if (count == 18) { Console.WriteLine(); Console.Write("{0} ", myArr[i]); count = 0; } else { Console.Write("{0} ", myArr[i]); count++; } } Console.WriteLine(); Console.WriteLine(); } }
Producción:
Initial Array: 0 0 1 2 7 126 78 55 255 78 45 198 200 1 1 1 1 255 255 2 4 4 77 77 77 77 77 0 1 index Array elements double values 0 00-00-01-02-07-7E-4E-37 2.73464354303054E-42 8 FF-4E-2D-C6-C8-01-01-01 7.74999325882041E-304 16 01-FF-FF-02-04-04-4D-4D 2.38727219494443E+64
Ejemplo 2: para ArgumentException
// C# program to demonstrate // BitConverter.ToDouble(Byte[], Int32) // Method using System; class GFG { // Main Method public static void Main() { try { // Define an array of byte values. byte[] bytes = {0,0,1,2,7,126,78,55, 255,78,45,198,200,1, 1,1,1,255,255,2,4,4, 77,77,77,77,77,0,1, 0,0,1,2,7,126,78,55, 255,78,45,198,200,1, 1,1,1,255,255,2,4,4, 255,255,255,255,245, 245,245,245,245,245, 245,245,245,245,0,0, 0,0,0,0,0,0,6,5,6,56, 31,31,31,54,23,253,}; // Display the values of the myArr. Console.WriteLine("Initial Array: "); // calling the PrintIndexAndValues() // method to print PrintIndexAndValues(bytes); // print char value Console.WriteLine("index Array elements"+ " double values"); Console.WriteLine(); // getting double value and Display it for (int index = 4; index < bytes.Length - 6; index = index + 8) { if (index == bytes.Length - 7) { Console.WriteLine(); Console.WriteLine("startIndex is equal to"+ " the length of bytes minus 7"); double values = BitConverter.ToDouble(bytes, index); Console.WriteLine(" {0} {1} {2}", index, BitConverter.ToString(bytes, index, 4), values); } else { double values = BitConverter.ToDouble(bytes, index); Console.WriteLine(" {0} {1} {2}", index, BitConverter.ToString(bytes, index, 8), values); } } } catch (ArgumentNullException e) { Console.Write("Exception Thrown: "); Console.Write("{0}", e.GetType(), e.Message); } catch (ArgumentOutOfRangeException e) { Console.Write("Exception Thrown: "); Console.Write("{0}", e.GetType(), e.Message); } catch (ArgumentException e) { Console.Write("Exception Thrown: "); Console.Write("{0}", e.GetType(), e.Message); } } // Defining the method // PrintIndexAndValues public static void PrintIndexAndValues(byte[] myArr) { int count = 0; for (int i = 0; i < myArr.Length; i++) { if (count == 18) { Console.WriteLine(); Console.Write("{0} ", myArr[i]); count = 0; } else { Console.Write("{0} ", myArr[i]); count++; } } Console.WriteLine(); Console.WriteLine(); } }
Producción:
Initial Array: 0 0 1 2 7 126 78 55 255 78 45 198 200 1 1 1 1 255 255 2 4 4 77 77 77 77 77 0 1 0 0 1 2 7 126 78 55 255 78 45 198 200 1 1 1 1 255 255 2 4 4 255 255 255 255 245 245 245 245 245 245 245 245 245 245 0 0 0 0 0 0 0 0 6 5 6 56 31 31 31 54 23 253 index Array elements double values 4 07-7E-4E-37-FF-4E-2D-C6 -1.16103254047091E+30 12 C8-01-01-01-01-FF-FF-02 3.13113229681351E-294 20 04-04-4D-4D-4D-4D-4D-00 3.25995134720157E-307 28 01-00-00-01-02-07-7E-4E 1.29525825666467E+70 36 37-FF-4E-2D-C6-C8-01-01 8.10420695824091E-304 44 01-01-FF-FF-02-04-04-FF -6.86302832487538E+303 52 FF-FF-FF-F5-F5-F5-F5-F5 -1.68827860814431E+260 60 F5-F5-F5-F5-F5-00-00-00 5.21927749055768E-312 68 00-00-00-00-00-06-05-06 1.15818454395586E-279 startIndex is equal to the length of bytes minus 7 Exception Thrown: System.ArgumentException
Ejemplo 3: para ArgumentOutOfRangeException
// C# program to demonstrate // BitConverter.ToDouble(Byte[], Int32) // Method using System; class GFG { // Main Method public static void Main() { try { // Define an array of byte values. byte[] bytes = {0,0,1,2,7,126,78,55, 255,78,45,198,200,1, 1,1,1,255,255,2,4,4, 77,77,77,77,77,0,1, 0,0,1,2,7,126,78,55, 255,78,45,198,200,1, 1,1,1,255,255,2,4,4, 255,255,255,255,245, 245,245,245,245,245, 245,245,245,245,0,0, 0,0,0,0,0,0,6,5,6,56, 31,31,31,54,23,253,}; // Display the values of the myArr. Console.WriteLine("Initial Array: "); // calling the PrintIndexAndValues() // method to print PrintIndexAndValues(bytes); // getting double value and Display it Console.WriteLine("startIndex is less than zero"); double values = BitConverter.ToDouble(bytes, -1); Console.WriteLine(" {0} {1} {2}", -1, BitConverter.ToString(bytes, -1, 8), values); } catch (ArgumentNullException e) { Console.Write("Exception Thrown: "); Console.Write("{0}", e.GetType(), e.Message); } catch (ArgumentOutOfRangeException e) { Console.Write("Exception Thrown: "); Console.Write("{0}", e.GetType(), e.Message); } catch (ArgumentException e) { Console.Write("Exception Thrown: "); Console.Write("{0}", e.GetType(), e.Message); } } // Defining the method // PrintIndexAndValues public static void PrintIndexAndValues(byte[] myArr) { int count = 0; for (int i = 0; i < myArr.Length; i++) { if (count == 18) { Console.WriteLine(); Console.Write("{0} ", myArr[i]); count = 0; } else { Console.Write("{0} ", myArr[i]); count++; } } Console.WriteLine(); Console.WriteLine(); } }
Producción:
Initial Array: 0 0 1 2 7 126 78 55 255 78 45 198 200 1 1 1 1 255 255 2 4 4 77 77 77 77 77 0 1 0 0 1 2 7 126 78 55 255 78 45 198 200 1 1 1 1 255 255 2 4 4 255 255 255 255 245 245 245 245 245 245 245 245 245 245 0 0 0 0 0 0 0 0 6 5 6 56 31 31 31 54 23 253 startIndex is less than zero Exception Thrown: System.ArgumentOutOfRangeException
Ejemplo 4: Para ArgumentNullException
// C# program to demonstrate // BitConverter.ToDouble(Byte[], Int32) // Method using System; class GFG { // Main Method public static void Main() { try { // Define an array of byte values. byte[] bytes = null; // getting double value and Display it Console.WriteLine("array bytes is null"); double values = BitConverter.ToDouble(bytes, 0); Console.WriteLine(" {0} {1} {2}", 0, BitConverter.ToString(bytes, 0, 8), values); } catch (ArgumentNullException e) { Console.Write("Exception Thrown: "); Console.Write("{0}", e.GetType(), e.Message); } catch (ArgumentOutOfRangeException e) { Console.Write("Exception Thrown: "); Console.Write("{0}", e.GetType(), e.Message); } catch (ArgumentException e) { Console.Write("Exception Thrown: "); Console.Write("{0}", e.GetType(), e.Message); } } // Defining the method // PrintIndexAndValues public static void PrintIndexAndValues(byte[] myArr) { int count = 0; for (int i = 0; i < myArr.Length; i++) { if (count == 18) { Console.WriteLine(); Console.Write("{0} ", myArr[i]); count = 0; } else { Console.Write("{0} ", myArr[i]); count++; } } Console.WriteLine(); Console.WriteLine(); } }
Producción:
array bytes is null Exception Thrown: System.ArgumentNullException
Referencia:
Publicación traducida automáticamente
Artículo escrito por RohitPrasad3 y traducido por Barcelona Geeks. The original can be accessed here. Licence: CCBY-SA