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Marshal.PtrToStringAnsi Method (IntPtr)

Copies all characters up to the first null from an unmanaged ANSI string to a managed String. Widens each ANSI character to Unicode.

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

public static string PtrToStringAnsi (
	IntPtr ptr
)
public static String PtrToStringAnsi (
	IntPtr ptr
)
public static function PtrToStringAnsi (
	ptr : IntPtr
) : String
Not applicable.

Parameters

ptr

The address of the first character of the unmanaged string.

Return Value

A managed String object that holds a copy of the unmanaged ANSI string. If ptr is a null reference (Nothing in Visual Basic), the method returns a null string.

PtrToStringAnsi is useful for custom marshaling or when mixing managed and unmanaged code. Since this method creates a copy of the unmanaged string's contents, you must free the original string as appropriate. This method provides the opposite functionality of Marshal.StringToCoTaskMemAnsi and Marshal.StringToHGlobalAnsi.

NoteNote:

This method uses SecurityAction.LinkDemand to prevent it from being called from untrusted code; only the immediate caller is required to have SecurityPermissionAttribute.UnmanagedCode permission. If your code can be called from partially trusted code, do not pass user input to Marshal class methods without validation. For important limitations on using the LinkDemand member, see Demand vs. LinkDemand.

The following code example uses the PtrToStringAnsi method to create a managed string from an unmanaged char array.

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

void main()
{
	// Create an unmanaged c string.
	const char * myString = "Hello managed world (from the unmanaged world)!";
	
	// Convert the c string to a managed String.
	String ^ myManagedString = Marshal::PtrToStringAnsi((IntPtr) (char *) myString);
	
	// Display the string to the console.
	Console::WriteLine(myManagedString);
}

Windows 98, Windows Server 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 Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0, 1.1, 1.0

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