C# 操作内存是如何实现的呢?让我们开始讲解吧:
我们先来看看C#中如何操作内存,也就是非托管的数据。这需要引用System.Runtime.InteropServices命名空间。该命名空间下的Marshal的一些静态方法提供了这样的功能:
- Marshal.ReadInt32()
- //从指定内存地址读取4位 C#操作内存
- Marshal.PtrToStringAnsi()
- //从指定内存地址读取字符串C#操作内存
- Marshal.WriteInt32()
- //将整数写到指定内存地址 C#操作内存
- Marshal.WriteByte()
- //将字符串写到指定内存地址我们来看看具体的代码:
- using System;
- using System.Text;
- using System.Runtime.InteropServices;
- internal sealed class RCEvent {
- public int Event;
- public int Flag;
- public string User;
- };
- //C#操作内存
- internal sealed class RCEventAgent {
- internal static RCEvent Read(IntPtr ptr){
- RCEvent Event = new RCEvent();
- Event.Event = ReadEvent(ptr);
- Event.Flag = ReadFlag(ptr);
- Event.User = ReadUser(ptr);
- return Event;
- }
- //C#操作内存
- internal static int ReadEvent(IntPtr basePtr) {
- return Marshal.ReadInt32(basePtr);
- }
- internal static int ReadFlag(IntPtr basePtr) {
- return Marshal.ReadInt32(basePtr,4);
- }
- internal static string ReadUser(IntPtr basePtr) {
- return Marshal.PtrToStringAnsi(
- new IntPtr(basePtr.ToInt32() + 8));
- }
- internal static void Write(ClientEvent Event,IntPtr ptr) {
- WriteEvent(ptr,Event.Event);
- WriteFlag(ptr,Event.Flag);
- WriteUser(ptr,Event.User);
- }
- //C#操作内存
- internal static void WriteEvent(
- IntPtr basePtr,int value) {
- Marshal.WriteInt32(basePtr,value);
- }
- internal static void WriteFlag(
- IntPtr basePtr,int flag) {
- Marshal.WriteInt32(basePtr,4,flag);
- }
- internal static void WriteUser(
- IntPtr basePtr,string user) {
- WriteString(basePtr,user,8,40);
- }
- private static void WriteString(
- IntPtr basePtr,string value,int offset,int length) {
- int pos = 0;
- byte[] bytes = Encoding.Default.GetBytes(value);
- while(pos ﹤ length) {
- if (pos ﹤ bytes.Length)
- Marshal.WriteByte(basePtr,offset,bytes[pos]);
- else
- Marshal.WriteByte(basePtr,offset,0);
- pos ++;
- offset ++;
- }
- } //C#操作内存
- }
这样我们就可以通过ReadEvent和WriteEvent直接在c#中处理该结构体。或者通过 ReadXXX() 和 WriteXXX() 直接修改其字段。
- public void DoSomething(IntPtr ptr){
- RCEvent Event = RCEventAgent.Read(ptr);
- Event.Flag ++;
- RCEventAgent.Write(ptr, Event);
- // 或者以下代码
- // RCEventAgent.WriteFlag( ptr, RCEventAgent.ReadFlag(ptr) + 1 );
- }
C++中则可以直接将结构体地址传给C#:
- #using ﹤mscorlib.dll﹥
- #using ﹤CuteSuProc.dll﹥
- void SomeMethod(RCEStruct* pEventStruc){
- MyCSharpDll::DoSomething(pEventStruc);
- }
C#操作内存的具体内容就向你介绍到这里,希望对你了解和学习C#操作内存有所帮助。
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