How to get character for a given ascii value
How can I get the ascii character of a given ascii code.
e.g. I'm looking for a method that开发者_Python百科 given the code 65 would return "A".
Thanks
Do you mean "A" (a string
) or 'A' (a char
)?
int unicode = 65;
char character = (char) unicode;
string text = character.ToString();
Note that I've referred to Unicode rather than ASCII as that's C#'s native character encoding; essentially each char
is a UTF-16 code point.
string c = Char.ConvertFromUtf32(65);
c will contain "A"
This works in my code.
string asciichar = (Convert.ToChar(65)).ToString();
Return: asciichar = 'A';
There are a few ways to do this.
Using char struct (to string and back again)
string _stringOfA = char.ConvertFromUtf32(65);
int _asciiOfA = char.ConvertToUtf32("A", 0);
Simply casting the value (char and string shown)
char _charA = (char)65;
string _stringA = ((char)65).ToString();
Using ASCIIEncoding.
This can be used in a loop to do a whole array of bytes
var _bytearray = new byte[] { 65 };
ASCIIEncoding _asiiencode = new ASCIIEncoding();
string _alpha = _asiiencode .GetString(_newByte, 0, 1);
You can override the type converter class, this would allow you to do some fancy validation of the values:
var _converter = new ASCIIConverter();
string _stringA = (string)_converter.ConvertFrom(65);
int _intOfA = (int)_converter.ConvertTo("A", typeof(int));
Here is the Class:
public class ASCIIConverter : TypeConverter
{
// Overrides the CanConvertFrom method of TypeConverter.
// The ITypeDescriptorContext interface provides the context for the
// conversion. Typically, this interface is used at design time to
// provide information about the design-time container.
public override bool CanConvertFrom(ITypeDescriptorContext context,
Type sourceType)
{
if (sourceType == typeof(string))
{
return true;
}
return base.CanConvertFrom(context, sourceType);
}
public override bool CanConvertTo(ITypeDescriptorContext context, Type destinationType)
{
if (destinationType == typeof(int))
{
return true;
}
return base.CanConvertTo(context, destinationType);
}
// Overrides the ConvertFrom method of TypeConverter.
public override object ConvertFrom(ITypeDescriptorContext context,
CultureInfo culture, object value)
{
if (value is int)
{
//you can validate a range of int values here
//for instance
//if (value >= 48 && value <= 57)
//throw error
//end if
return char.ConvertFromUtf32(65);
}
return base.ConvertFrom(context, culture, value);
}
// Overrides the ConvertTo method of TypeConverter.
public override object ConvertTo(ITypeDescriptorContext context,
CultureInfo culture, object value, Type destinationType)
{
if (destinationType == typeof(int))
{
return char.ConvertToUtf32((string)value, 0);
}
return base.ConvertTo(context, culture, value, destinationType);
}
}
Here's a function that works for all 256 bytes, and ensures you'll see a character for each value:
static char asciiSymbol( byte val )
{
if( val < 32 ) return '.'; // Non-printable ASCII
if( val < 127 ) return (char)val; // Normal ASCII
// Workaround the hole in Latin-1 code page
if( val == 127 ) return '.';
if( val < 0x90 ) return "€.‚ƒ„…†‡ˆ‰Š‹Œ.Ž."[ val & 0xF ];
if( val < 0xA0 ) return ".‘’“”•–—˜™š›œ.žŸ"[ val & 0xF ];
if( val == 0xAD ) return '.'; // Soft hyphen: this symbol is zero-width even in monospace fonts
return (char)val; // Normal Latin-1
}
It can also be done in some other manner
byte[] pass_byte = Encoding.ASCII.GetBytes("your input value");
and then print result. by using foreach
loop.
Simply Try this:
int n = Convert.ToInt32(Console.ReadLine());
Console.WriteLine("data is: {0}", Convert.ToChar(n));
I believe a simple cast can work
int ascii = (int) "A"
Sorry I dont know Java, but I was faced with the same problem tonight, so I wrote this (it's in c#)
public string IncrementString(string inboundString) {
byte[] bytes = System.Text.Encoding.ASCII.GetBytes(inboundString.ToArray);
bool incrementNext = false;
for (l = -(bytes.Count - 1); l <= 0; l++) {
incrementNext = false;
int bIndex = Math.Abs(l);
int asciiVal = Conversion.Val(bytes(bIndex).ToString);
asciiVal += 1;
if (asciiVal > 57 & asciiVal < 65)
asciiVal = 65;
if (asciiVal > 90) {
asciiVal = 48;
incrementNext = true;
}
bytes(bIndex) = System.Text.Encoding.ASCII.GetBytes({ Strings.Chr(asciiVal) })(0);
if (incrementNext == false)
break; // TODO: might not be correct. Was : Exit For
}
inboundString = System.Text.Encoding.ASCII.GetString(bytes);
return inboundString;
}
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