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Marshal.StringToHGlobalUni(String) Method

Definition

Copies the contents of a managed String into unmanaged memory.

public:
 static IntPtr StringToHGlobalUni(System::String ^ s);
[System.Security.SecurityCritical]
public static IntPtr StringToHGlobalUni (string s);
public static IntPtr StringToHGlobalUni (string? s);
public static IntPtr StringToHGlobalUni (string s);
[<System.Security.SecurityCritical>]
static member StringToHGlobalUni : string -> nativeint
static member StringToHGlobalUni : string -> nativeint
Public Shared Function StringToHGlobalUni (s As String) As IntPtr

Parameters

s
String

A managed string to be copied.

Returns

IntPtr

nativeint

The address, in unmanaged memory, to where the s was copied, or 0 if s is null.

Attributes

Exceptions

The method could not allocate enough native heap memory.

The s parameter exceeds the maximum length allowed by the operating system.

Remarks

StringToHGlobalUni is useful for custom marshaling or for use when mixing managed and unmanaged code. Because this method allocates the unmanaged memory required for a string, always free the memory by calling FreeHGlobal. This method provides the opposite functionality of Marshal.PtrToStringUni.

This method copies embedded null characters, and includes a terminating null character.

This API reflects the Windows definition of Unicode, which is a UTF-16 2-byte encoding. On many non-Windows platforms, the wchar_t data-type is 4-bytes, not 2-bytes. Consult your compiler to confirm if wchar_t can be used or char16_t should be used instead.

Applies to

See also