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Marshal::ReadByte Method (IntPtr)

Reads a single byte from unmanaged memory.

Namespace:  System.Runtime.InteropServices
Assembly:  mscorlib (in mscorlib.dll)

public:
static unsigned char ReadByte(
	IntPtr ptr
)

Parameters

ptr
Type: System::IntPtr

The address in unmanaged memory from which to read.

Return Value

Type: System::Byte
The byte read from unmanaged memory.

ExceptionCondition
AccessViolationException

ptr is not a recognized format.

-or-

ptr is nullptr.

-or-

ptr is invalid.

ReadByte has an implied offset of 0. This method enables direct interaction with an unmanaged C-style byte array, eliminating the expense of copying an entire unmanaged array (using Marshal::Copy) to a separate managed array before reading its element values.

Reading from unaligned memory locations is supported.

The following example creates a block of unmanaged memory, writes a byte to the unmanaged memory, reads the byte back from unmanaged memory, and then disposes the unmanaged memory.

No code example is currently available or this language may not be supported.

The following example demonstrates how to use the ReadByte method to read the value of an unmanaged character.


using namespace System;
using namespace System::Runtime::InteropServices;



void main()
{
	// Create an unmanaged byte. 
	const char * myString = "b";

	// Read the c string as a managed byte.
        Byte ^ myManagedByte = Marshal::ReadByte((IntPtr) (char *) myString);

	// Display the byte to the console.
	Console::WriteLine(myManagedByte);
}

.NET Framework

Supported in: 4.6, 4.5, 4, 3.5, 3.0, 2.0, 1.1

.NET Framework Client Profile

Supported in: 4, 3.5 SP1

XNA Framework

Supported in: 3.0, 2.0, 1.0

Portable Class Library

Supported in: Portable Class Library

Supported in: Windows Phone 8.1

Supported in: Windows Phone Silverlight 8.1

Supported in: Windows Phone Silverlight 8

  • SecurityCriticalAttribute 

    requires full trust for the immediate caller. This member cannot be used by partially trusted or transparent code.

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