C#如何使用COPYDATASTRUCT传递一个自定义结构

[阳光919]

比如如下一个结构:(C#中定义)
[StructLayout(LayoutKind.Sequential)]
public struct Mydata
{
public string str1;
public string str2;
public string str3;
public int str4;
public bool str5;
}
结构原形我在Delphi中已经声明,请教各位,如何通过使用WM_COPYDATA消息,在两个程序间传递这个结构???
请大家不吝赐教!!!

[feiyun0112]

需要指定string 的大小

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[dayizhixiaotutu]

public struct COPYDATASTRUCT
{
public IntPtr dwData;
public int cbData;
[MarshalAs(UnmanagedType.LPStr)]
public string lpData;

}

[阳光919]

定义:
[StructLayout(LayoutKind.Sequential)]
public struct Mydata
{
public string str1;
public string str2;
public string str3;
public int str4;
public bool str5;
}
消息结构定义:
[StructLayout(LayoutKind.Sequential)]
public struct COPYDATASTRUCT
{
public IntPtr dwData;
public int cbData;
[MarshalAs(UnmanagedType.LPStr)]
public string lpData;
}
发送消息时我这样写的:
COPYDATASTRUCT cd1 = new COPYDATASTRUCT();
Mydata md1 = new Mydata();
...........//给md1结构赋值
IntPtr Buffer = Marshal.AllocCoTaskMem(Marshal.SizeOf(md1));
Marshal.StructureToPtr(md1,Buffer,false);
cd1.cbData = Marshal.SizeOf(md1);
cd1.dwData = Buffer;
cd1.lpData = Buffer.ToString();//此处我不知道该怎么写???????
请教,发送还有接收时,应该怎样处理呢?

[dayizhixiaotutu]

发送方
public struct COPYDATASTRUCT
        {
            public IntPtr dwData;
            public int cbData;
            [MarshalAs(UnmanagedType.LPStr)]
            public string lpData;

        }
        const int WM_COPYDATA = 0x004A;

        [DllImport("User32.dll", EntryPoint = "SendMessage")]
        private static extern int SendMessage(
        int hWnd, // handle to destination window
        int Msg, // message
        int wParam, // first message parameter
        ref COPYDATASTRUCT lParam // second message parameter
        );

        [DllImport("User32.dll", EntryPoint = "FindWindow")]
        private static extern int FindWindow(string lpClassName, string
        lpWindowName);


        public Form1()
        {
            InitializeComponent();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            int WINDOW_HANDLER = FindWindow(null, @"ReceiveMessage");
            if (WINDOW_HANDLER == 0)
            {
                return;
            }
            else
            {
                byte[] sarr = System.Text.Encoding.Default.GetBytes(this.textBox1.Text);
                int len = sarr.Length;
                COPYDATASTRUCT cds;
                cds.dwData = (IntPtr)100;
                cds.lpData = this.textBox1.Text;
                cds.cbData = len + 1;
                SendMessage(WINDOW_HANDLER, WM_COPYDATA, 0, ref cds);

            }

        }

[阳光919]

自己顶一下!

[dayizhixiaotutu]

接受
public struct COPYDATASTRUCT
        {
            public IntPtr dwData;
            public int cbData;
            [MarshalAs(UnmanagedType.LPStr)]
            public string lpData;

        }
        const int WM_COPYDATA = 0x004A;
        public Form1()
        {
            InitializeComponent();
        }

        protected override void DefWndProc(ref Message m)
        {
            switch (m.Msg)
            {
                case WM_COPYDATA:
                    COPYDATASTRUCT mystr = new COPYDATASTRUCT();
                    Type mytype = mystr.GetType();
                    mystr = (COPYDATASTRUCT)m.GetLParam(mytype);
                    this.textBox1.Text = mystr.lpData;
                    break;
                default:
                    base.DefWndProc(ref m);
                    break;
            }
        }

[阳光919]

[Quote=引用 4 楼 dayizhixiaotutu 的回复:]
C# code发送方
public struct COPYDATASTRUCT
{
public IntPtr dwData;
public int cbData;
[MarshalAs(UnmanagedType.LPStr)]
public string lpData;

}
const int WM_COPYDATA = 0x004A;

[DllImport("User32.dll", EntryPoint = "SendMessage")]
private static extern int SendMessage(
int hWnd, // handle…
[/Quote]

我问的是如何传递一个结构,我通常使用的是用C#写接口,在里面定义函数,通过函数参数传递结构.但是那样很麻烦,我想用WM_COPYDATA 消息函数来实现,用这个消息传递单个的字符串我已经实现了,我就是不知道怎么用它来传递一个结构????
typedef struct tagCOPYDATASTRUCT{
DWORD dwData;//用户定义数据
DWORD cbData;//数据大小
PVOID lpData;//指向数据的指针
}COPYDATASTRUCT;
该结构用来定义用户数据。
我不知道在C#里,如何实现让lpData成为指向数据的指针的指针,还有就是接收的时候如何接收指向指针的指针???

[feiyun0112]

http://www.cnblogs.com/feiyun0112/archive/2007/02/01/637280.html

[阳光919]

感谢 feiyun0112
看了您的文章,我受益匪浅!
再请教一下,如果是给其他程序,比如delphi开发的程序,或者VB开发的程序,它们给C#窗体发送WM_COPYDATA 消息,或者反过来,C#给它们发送WM_COPYDATA 消息,接收的时候应该注意些什么呢??????

[feiyun0112]

一样一样的啊

[chinarenjf]

顶......