Code:
/ 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / wpf / src / UIAutomation / Win32Providers / MS / Internal / AutomationProxies / CommonRemoteMemoryBlock.cs / 1305600 / CommonRemoteMemoryBlock.cs
//---------------------------------------------------------------------------- // //// Copyright (C) Microsoft Corporation. All rights reserved. // // // Description: // Module to allocate shared memory between process. // The memory allocation scheme is different for Win 9x and WinNT // Performance measurements showed that using a global heap mechanism // is fastest on Win 9x. // // When the dll is loaded, a counter is set to 1. For each instance // creation/destruction, the counter is is incremented/decremented. // When the dll is released, the counter gets to zero and the static // heap on Win 9x is destroyed. // // History: // 07/01/2003 : a-jeanp Created //--------------------------------------------------------------------------- using System; using System.ComponentModel; using System.Security; using System.Security.Permissions; using System.Runtime.InteropServices; using System.Runtime.CompilerServices; using System.Windows.Automation; using Microsoft.Win32.SafeHandles; using MS.Win32; namespace MS.Internal.AutomationProxies { // Class to allocate shared memory between process. class RemoteMemoryBlock : SafeHandleZeroOrMinusOneIsInvalid { // ----------------------------------------------------- // // Constructors // // ----------------------------------------------------- #region Constructors // This constructor is used by the P/Invoke marshaling layer // to allocate a SafeHandle instance. P/Invoke then does the // appropriate method call, storing the handle in this class. private RemoteMemoryBlock() : base(true) {} internal RemoteMemoryBlock(int cbSize, SafeProcessHandle processHandle) : base(true) { _processHandle = processHandle; SetHandle(Misc.VirtualAllocEx(_processHandle, IntPtr.Zero, new UIntPtr((uint)cbSize), UnsafeNativeMethods.MEM_COMMIT, UnsafeNativeMethods.PAGE_READWRITE)); } // Uncomment this if & only if we need a constructor // that takes a handle from external code //internal RemoteMemoryBlock(IntPtr preexistingHandle, bool ownsHandle) : base(ownsHandle) //{ // SetHandle(preexistingHandle); //} // protected override bool ReleaseHandle() { return Misc.VirtualFreeEx(_processHandle, handle, UIntPtr.Zero, UnsafeNativeMethods.MEM_RELEASE); } #endregion // ------------------------------------------------------ // // Internal Methods // // ----------------------------------------------------- #region Internal Methods internal IntPtr Address { get { return handle; } } internal void WriteTo(IntPtr sourceAddress, IntPtr cbSize) { int count; Misc.WriteProcessMemory(_processHandle, handle, sourceAddress, cbSize, out count); } internal void ReadFrom(IntPtr remoteAddress, IntPtr destAddress, IntPtr cbSize) { int count; Misc.ReadProcessMemory(_processHandle, remoteAddress, destAddress, cbSize, out count); } internal void ReadFrom(SafeCoTaskMem destAddress, IntPtr cbSize) { int count; Misc.ReadProcessMemory(_processHandle, handle, destAddress, cbSize, out count); } internal void ReadFrom(IntPtr destAddress, IntPtr cbSize) { int count; Misc.ReadProcessMemory(_processHandle, handle, destAddress, cbSize, out count); } // Helper function to handle common scenario of translating a remote // unmanaged char/wchar buffer in to a managed string object. internal bool ReadString (out string str, int maxLength) { // Clear the return string str = null; // Ensure there is a buffer size if (0 >= maxLength) { return false; } // Ensure proper allocation using (SafeCoTaskMem ptr = new SafeCoTaskMem(maxLength)) { if (ptr.IsInvalid) { return false; } // Copy remote buffer back to local process... ReadFrom(ptr, new IntPtr(maxLength * sizeof (char))); // Convert the local unmanaged buffer in to a string object str = ptr.GetStringUni(maxLength); // Note: lots of "old world" strings are null terminated // Leaving the null termination in the System.String may lead // to some issues when used with the StringBuilder int nullTermination = str.IndexOf('\0'); if (-1 != nullTermination) { // We need to strip null terminated char and everything behind it from the str str = str.Remove(nullTermination, maxLength - nullTermination); } return true; } } #endregion // ------------------------------------------------------ // // Private Fields // // ------------------------------------------------------ #region Private Fields private SafeProcessHandle _processHandle; // Handle of remote process #endregion } } // File provided for Reference Use Only by Microsoft Corporation (c) 2007. // Copyright (c) Microsoft Corporation. All rights reserved.
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