班级人数错误 [英] Error on size of class
本文介绍了班级人数错误的处理方法，对大家解决问题具有一定的参考价值，需要的朋友们下面随着小编来一起学习吧！
问题描述
将字节数组转换为类或结构时遇到问题. 该类是这样的:
I have a problem with converting a byte array into a class or struct. The class is like this:
[Serializable()]
[StructLayout(LayoutKind.Sequential, Pack = 1, CharSet = CharSet.Ansi)]
public class General {
[MarshalAs(UnmanagedType.ByValArray, SizeConst = Defines.CENTR_NAME_LENGTH + 1)] byte[] centralName;
[MarshalAs(UnmanagedType.ByValArray, SizeConst = Defines.PROJECT_NAME_LENGTH + 1)] byte[] projectName;
byte misc;
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 6)] byte[] accessCode2;
byte transmActive;
byte transmHour;
byte transmMin;
[MarshalAs(UnmanagedType.U1)] public int Cp;
[MarshalAs(UnmanagedType.U1)] public int Rp;
[MarshalAs(UnmanagedType.U1)] public int Lcd;
[MarshalAs(UnmanagedType.U1)] public int Relais;
[MarshalAs(UnmanagedType.U1)] public int Pr;
[MarshalAs(UnmanagedType.U1)] public int Sc;
byte rd;
byte reserve1;
[MarshalAs(UnmanagedType.U1)] public int LocalCentrId;
[MarshalAs(UnmanagedType.U1)] public int PrinterSel;
[MarshalAs(UnmanagedType.U1)] public int Slave1;
[MarshalAs(UnmanagedType.U1)] public int Slave2;
[MarshalAs(UnmanagedType.U1)] public int Slave3;
[MarshalAs(UnmanagedType.U1)] public int Master;
[MarshalAs(UnmanagedType.U1)] public int AlarmRepeat;
[MarshalAs(UnmanagedType.U1)] public int FaultRepeat;
[MarshalAs(UnmanagedType.U1)] public int ResetSil1;
[MarshalAs(UnmanagedType.U1)] public int ResetSil2;
[MarshalAs(UnmanagedType.U1)] public int EvacDelayed1;
[MarshalAs(UnmanagedType.U1)] public int EvacDelayed2;
[MarshalAs(UnmanagedType.U1)] public int Led1;
[MarshalAs(UnmanagedType.U1)] public int Led2;
[MarshalAs(UnmanagedType.U1)] public int GenControl;
[MarshalAs(UnmanagedType.U1)] public int ExtraGenControl;
[MarshalAs(UnmanagedType.ByValArray, SizeConst = Defines.MAX_NMB_SIL_CONTROL)] byte[] silenceControls ;
byte autoResetFault;
byte autoResetSC;
[MarshalAs(UnmanagedType.U1)] public int InitEvacDelay;
[MarshalAs(UnmanagedType.U1)] public int SilenceEvacOff;
byte summerTime;
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 6)] byte[] accessCode1;
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 16)] byte[] btPinCode;
public string CentralName { get { return Encoding.ASCII.GetString(centralName); } set { centralName = Encoding.ASCII.GetBytes(value); } }
public string ProjectName { get { return Encoding.ASCII.GetString(projectName); } set { projectName = Encoding.ASCII.GetBytes(value); } }
public bool BackBeep {
get {
return (misc & 0x01) != 0x00;
}
set {
if (value) {
misc |= 0x01;
} else {
misc ^= 0x01;
}
}
}
public bool StartStopEvac {
get {
return (misc & 0x02) != 0x00;
}
set {
if (value) {
misc |= 0x02;
} else {
misc ^= 0x02;
}
}
}
public bool GenBehEvacKey {
get {
return (misc & 0x04) != 0x00;
}
set {
if (value) {
misc |= 0x04;
} else {
misc ^= 0x04;
}
}
}
public bool GenBehEvacDet {
get {
return (misc & 0x08) != 0x00;
}
set {
if (value) {
misc |= 0x08;
} else {
misc ^= 0x08;
}
}
}
public bool EvacDelayed {
get {
return (misc & 0x10) != 0x00;
}
set {
if (value) {
misc |= 0x10;
} else {
misc ^= 0x10;
}
}
}
public bool SirService {
get {
return (misc & 0x20) != 0x00;
}
set {
if (value) {
misc |= 0x20;
} else {
misc ^= 0x20;
}
}
}
public bool ResetSilService {
get {
return (misc & 0x40) != 0x00;
}
set {
if (value) {
misc |= 0x40;
} else {
misc ^= 0x40;
}
}
}
public string AccessCode1 { get { return Encoding.ASCII.GetString(accessCode1); } set { accessCode1 = Encoding.ASCII.GetBytes(value); } }
public string AccessCode2 { get { return Encoding.ASCII.GetString(accessCode2); } set { accessCode2 = Encoding.ASCII.GetBytes(value); } }
public bool EvacDirect { get { return transmActive == 0x01; } set { transmActive = (Byte)(value ? 0x01 : 0x00); } }
public TimeSpan EvacDirectTime { get { return new TimeSpan(transmHour, transmMin, 0); } set { transmHour = (Byte)value.Hours; transmMin = (Byte)value.Minutes; } }
public bool Rd { get { return rd == 0x01; } set { rd = (value ? (Byte)0x01 : (Byte)0x00); } }
public List<int> SilenceControl {
get {
List<int> retVal = new List<int>();
if (silenceControls != null) {
foreach (byte b in silenceControls) {
retVal.Add(b);
}
}
return retVal;
}
set {
silenceControls = new byte[Defines.MAX_NMB_SIL_CONTROL];
for (int t = 0; t < Defines.MAX_NMB_SIL_CONTROL && t < value.Count; ++t) {
silenceControls[t] = (Byte)value[t];
}
}
}
public bool AutoResetFault { get { return autoResetFault == 0x01; } set { autoResetFault = (Byte)(value ? 0x01 : 0x00); } }
public bool AutoResetPower { get { return autoResetSC == 0x01; } set { autoResetSC = (Byte)(value ? 0x01 : 0x00); } }
public bool SummerTime { get { return summerTime == 0x01; } set { summerTime = (Byte)(value ? 0x01 : 0x00); } }
public string BtPinCode { get { return Encoding.ASCII.GetString(btPinCode); } set { btPinCode = Encoding.ASCII.GetBytes(value); } }
public General() {
Console.WriteLine("Create General");
SetDefault();
}
public void SetDefault() {
CentralName = "MD2400";
ProjectName = "Limotec";
Cp = 1;
Rp = 0;
Lcd = 0;
Relais = 1;
Pr = 0;
Sc = 1;
Rd = true;
BackBeep = false;
AccessCode1 = "654321";
AccessCode2 = "123456";
EvacDirect = false;
EvacDirectTime = new TimeSpan( 0, 0, 0 );
BtPinCode = "1111111111111111";
SummerTime = true;
GenControl = 1;
ExtraGenControl = 0;
SilenceControl.Add( 3 );
InitEvacDelay = 2;
EvacDelayed = false;
StartStopEvac = false;
SirService = false;
ResetSilService = false;
GenBehEvacKey = true;
GenBehEvacDet = true;
Master = 32;
Slave1 = 0;
Slave2 = 0;
Slave3 = 0;
AlarmRepeat = 0;
FaultRepeat = 0;
ResetSil1 = 0;
ResetSil2 = 0;
Led1 = 0;
Led2 = 0;
EvacDelayed1 = 0;
EvacDelayed2 = 0;
LocalCentrId = 0;
AutoResetFault = true;
AutoResetPower = true;
}
[OnDeserialized()]
internal void OnDeserialized(StreamingContext contect) {
Config.Singleton.Log.Info( string.Format( "General loaded: {0} {1}", CentralName, ProjectName ) );
}
}
当我执行Marshall.SizeOf(typeof(General))时，我收到ArgumentException.无法计算大小或偏移量.
When I do Marshall.SizeOf(typeof(General)) I get an ArgumentException. The size or offset cannot be calculated.
如果我在同一类中使用私有变量和公共属性，是否有问题?这些属性仅用于将变量转换成更有用的东西. (将字节数组转换为字符串)
Is there a problem if I use private variables and public properties in the same class? The properties are only for converting the variable in something more usefull. (Byte array into string)
如何解决它，以便可以使用Marshal.PtrToStructure将字节数组放入类中?
How can I solve it so that I can put a byte array into the class using Marshal.PtrToStructure ?
推荐答案
对我来说，它可以正常工作:我得到43，它与2 * 21 + 1一致.我已经检查了.NET 2.0、3.5和4.5(对于4.5我同时检查了x86和x64)-看起来还不错.
For me it just works: I get 43, which agrees with 2 * 21 + 1. I've checked .NET 2.0, 3.5 and 4.5 (and for 4.5 I checked both x86 and x64) - it just seems fine.
不，属性无关紧要:元帅代码仅查看字段.
No, properties don't matter: the marshal code is only looking at fields.
会发生什么是因为数据不匹配:
无法整理类型，因为嵌入式数组实例的长度与布局中声明的长度不匹配.
Type could not be marshaled because the length of an embedded array instance does not match the declared length in the layout.
您需要确保数组的长度正确-以下内容很难看，但是可以排序(不要设置超长字符串！):
You need to ensure the arrays are of the right length - the following is ugly, but works, sort-of (don't set an over-length string!):
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 21)]
byte[] centralName = new byte[21];
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 21)]
byte[] projectName = new byte[21];
byte misc;
public string CentralName {
get {
int i = Array.IndexOf(centralName, (byte)0);
if (i < 0) i = centralName.Length;
return Encoding.ASCII.GetString(centralName, 0, i);
}
set {
Array.Clear(centralName, 0, centralName.Length);
Encoding.ASCII.GetBytes(value, 0, value.Length, centralName, 0);
} }
public string ProjectName {
get {
int i = Array.IndexOf(projectName, (byte)0);
if (i < 0) i = projectName.Length;
return Encoding.ASCII.GetString(projectName, 0, i);
}
set {
Array.Clear(projectName, 0, projectName.Length);
Encoding.ASCII.GetBytes(value, 0, value.Length, projectName, 0);
} }
示例:
unsafe static void Main()
{
int i = Marshal.SizeOf(typeof(General));
General obj = new General { CentralName = "abc", ProjectName = "def" },
clone;
byte[] b = new byte[i];
fixed(byte* a = b)
{
IntPtr ptr= new IntPtr(a);
Marshal.StructureToPtr(obj, ptr, false);
clone = (General) Marshal.PtrToStructure(ptr, typeof(General));
}
Console.WriteLine(clone.CentralName); // abc
Console.WriteLine(clone.ProjectName); // def
}
或:
unsafe static void Main()
{
int i = Marshal.SizeOf(typeof(General));
General obj = new General { CentralName = "abc", ProjectName = "def" },
clone;
byte* a = stackalloc byte[i];
IntPtr ptr= new IntPtr(a);
Marshal.StructureToPtr(obj, ptr, false);
clone = (General) Marshal.PtrToStructure(ptr, typeof(General));
Console.WriteLine(clone.CentralName); // abc
Console.WriteLine(clone.ProjectName); // def
}
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