Marshal.StringToHGlobalUni Method
Copies the contents of a managed String into unmanaged memory.
Assembly: mscorlib (in mscorlib.dll)
Parameters
- s
- Type: System.String
A managed string to be copied.
Return Value
Type: System.IntPtrThe address, in unmanaged memory, to where the s was copied, or 0 if s is null.
| Exception | Condition |
|---|---|
| OutOfMemoryException |
The method could not allocate enough native heap memory. |
| ArgumentOutOfRangeException |
The s parameter exceeds the maximum length allowed by the operating system. |
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.
The following example demonstrates how to convert the contents of a managed String class to unmanaged memory and then dispose of the unmanaged memory when done.
using namespace System; using namespace System::Runtime::InteropServices; int main() { // Create a managed string. String^ managedString = "Hello unmanaged world (from the managed world)."; // Marshal the managed string to unmanaged memory. char* stringPointer = (char*) Marshal::StringToHGlobalAnsi(managedString).ToPointer(); // Always free the unmanaged string. Marshal::FreeHGlobal((IntPtr)stringPointer); return 0; }
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SecurityCriticalAttribute
requires full trust for the immediate caller. This member cannot be used by partially trusted or transparent code.
Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows XP SP2 x64 Edition, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
