c#中Marshal.Copy方法的使用

解决的问题：复制数组在内存中的数据到自定义结构中。 类似功能： 在C++中 原型：extern void *memcpy(void *dest, void *src, unsigned int count); 功能：由src所指内存区域复制count个字节到dest所指内存区域。 在c#中Marshal.Copy可以实现类似功能。 需要引用的單元：using System.Runtime.InteropServices; 我定義的數據結構： public struct RUID { public byte[] id; public byte status; public RUID(int Size)//結構的構造函數 { id = new byte[Size]; status = 0; } } 應用： public class WinLable :Label { protected override void WndProc(ref Message m) { int j; string dl = string.Empty; string c = string.Empty; int v=0; temhandle = IntPtr.Zero; strid = string.Empty; time = string.Empty; switch (m.Msg) { case WM_MSG_UID: if ((protext == "") &&( memo=="")) { RUID uid = new RUID(4); IntPtr puid = Marshal.AllocHGlobal(Marshal.SizeOf(typeof(RUID))); Marshal.StructureToPtr(uid, puid, false); Marshal.Copy(m.WParam, idnew, 0, 5);//Marshal.SizeOf(uid) if (((idnew[0] ^ idnew[1] ^ idnew[2] ^ idnew[3]) & 0xC0) == (idnew[4] & 0xC0))//判斷BCC { strid = string.Empty; for (j = 0; j < 4; j++) { c = Convert.ToString(idnew[j], 16); if (c.Length == 1) c = "0" + c; if (strid.Length == 0) strid = c; else strid = strid + "-" + c; } strid = strid.ToUpper(); v = idnew[4] & 0x0F; //電量的統計 switch (v) { case 0: dl= " Empty"; break; case 1: dl = " 1/8"; break; case 2: dl = " 2/8"; break; case 3: dl = " 3/8"; break; case 4: dl = " 4/8"; break; case 5: dl = " 5/8"; break; case 6: dl = " 6/8"; break; case 7: dl = " 7/8"; break; case 8: dl = " Full"; break; } idFlag = false;//為true的時候執行過程 idS = LabelList.IndexOf(this.Handle); if (idList[idS].IndexOf(strid) > -1) { int timeT = Convert.ToInt32(ReadTime); DateTime dt = DateTime.Now; time = string.Empty; time = string.Format("{0:yyyyMMddHHmm}", dt); long span = Convert.ToInt64(time); long rtime = Convert.ToInt64(timeList[idS][idList[idS].IndexOf(strid)].ToString()); if (span - rtime >= timeT)//讀取時間間隔 { if (sumList[idS].IndexOf(strid) > -1) { idFlag = false; } else { idFlag = true; } } } else { //addFlag = true; idList[idS].Add(strid); for (int i = 0; i < labcum; i++) { if (i != idS) { if (idList[i].IndexOf(strid) > -1) { timeList[i].RemoveAt(idList[i].IndexOf(strid)); idList[i].Remove(strid); if (sumList[i].IndexOf(strid) > -1) sumList[i].Remove(strid); } } } DateTime dt = DateTime.Now; time = string.Format("{0:yyyyMMddHHmm}", dt); timeList[idS].Add(time); memo = "idList" + idS.ToString() + " 添加新數據: " + Environment.NewLine + strid + " " + time + Environment.NewLine+"電量："+dl; } if (idFlag) { temhandle = this.Handle; try { Thread ProThread = new Thread(new ThreadStart(MainForm.DbStoredP2)); ProThread.Start(); } catch { memo = strid + " 線程調用出錯"; } sumList[idS].Add(strid); } } } else base.WndProc(ref m); break; default: base.WndProc(ref m); // DefWndProc(ref m); WndProc(ref m); break; } } }