GetBytes Method (Char*, Int32, Byte*, Int32)

ASCIIEncoding.GetBytes Method (Char*, Int32, Byte*, Int32)

Note: This method is new in the .NET Framework version 2.0.

Encodes a set of characters starting at the specified character pointer into a sequence of bytes that are stored starting at the specified byte pointer.

This method is not CLS-compliant.  The CLS-compliant alternative is GetBytes(Char[],Int32,Int32,Byte[],Int32).

Namespace: System.Text
Assembly: mscorlib (in mscorlib.dll)

public override int GetBytes (
	char* chars,
	int charCount,
	byte* bytes,
	int byteCount
J# does not support APIs that consume or return unsafe types.
JScript does not support APIs that consume or return unsafe types.



A pointer to the first character to encode.


The number of characters to encode.


A pointer to the location at which to start writing the resulting sequence of bytes.


The maximum number of bytes to write.

Return Value

The actual number of bytes written at the location indicated by bytes.

Exception typeCondition


chars is a null reference (Nothing in Visual Basic).


bytes is a null reference (Nothing in Visual Basic).


charCount or byteCount is less than zero.


byteCount is less than the resulting number of bytes.

To calculate the exact array size required by GetBytes to store the resulting bytes, use GetByteCount. To calculate the maximum array size, use GetMaxByteCount. The GetByteCount method generally allows you to allocate less memory, whereas the GetMaxByteCount method generally executes faster.

If the data to be converted is available only in sequential blocks (such as data read from a stream) or if the amount of data is so large that it needs to be divided into smaller blocks, use the Decoder or the Encoder provided by the GetDecoder method or the GetEncoder method, respectively.

ASCIIEncoding does not provide error detection. Any Unicode character greater than U+007F is translated to an ASCII question mark ('?').

Caution noteCaution

For security reasons, it is recommended that you use UTF8Encoding, UnicodeEncoding, or UTF32Encoding and enable error detection.

Windows 98, Windows 2000 SP4, Windows Millennium Edition, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The .NET Framework does not support all versions of every platform. For a list of the supported versions, see System Requirements.

.NET Framework

Supported in: 2.0

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