Marshal.AllocHGlobal Method (IntPtr)
Allocates memory from the unmanaged memory of the process by using the pointer to the specified number of bytes.
Namespace: System.Runtime.InteropServices
Assembly: mscorlib (in mscorlib.dll)
Parameters
- cb
- Type: System.IntPtr
The required number of bytes in memory.
Return Value
Type: System.IntPtrA pointer to the newly allocated memory. This memory must be released using the Marshal.FreeHGlobal method.
| Exception | Condition |
|---|---|
| OutOfMemoryException | There is insufficient memory to satisfy the request. |
AllocHGlobal is one of two memory allocation methods in the Marshal class. (Marshal.AllocCoTaskMem is the other.) This method exposes the Win32 LocalAlloc function from Kernel32.dll.
When AllocHGlobal calls LocalAlloc, it passes a LMEM_FIXED flag, which causes the allocated memory to be locked in place. Also, the allocated memory is not zero-filled.
- SecurityCriticalAttribute
requires full trust for the immediate caller. This member cannot be used by partially trusted or transparent code.
Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)
The .NET Framework does not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.
