private static void MarshalCOMVariant()
{
MarshalCOMDataTypeClass comObj = new MarshalCOMDataTypeClass();
object outArg = null;
string description = string.Empty;
uint uintArg = 10;
description = comObj.MarshalCOMVariant(uintArg, out outArg);
Console.WriteLine("VARIANT - uint: {0}, {1}, {2}",
uintArg.GetType().Name, outArg.GetType().Name, description);
double doubleArg = 10.0;
description = comObj.MarshalCOMVariant(doubleArg, out outArg);
Console.WriteLine("VARIANT - double: {0}, {1}, {2}",
doubleArg.GetType().Name, outArg.GetType().Name, description);
string stringArg = "�ַ���";
description = comObj.MarshalCOMVariant(stringArg, out outArg);
Console.WriteLine("VARIANT - string: {0}, {1}, {2}",
stringArg.GetType().Name, outArg.GetType().Name, description);
decimal decimalArg = 10.20m;
description = comObj.MarshalCOMVariant(decimalArg, out outArg);
Console.WriteLine("VARIANT - decimal: {0}, {1}, {2}",
decimalArg.GetType().Name, outArg.GetType().Name, description);
CurrencyWrapper currencyArg = new CurrencyWrapper(10.20m);
description = comObj.MarshalCOMVariant(currencyArg, out outArg);
Console.WriteLine("VARIANT - currency: {0}, {1}, {2}",
currencyArg.GetType().Name, outArg.GetType().Name, description);
DateTime dateArg = new DateTime(2008, 8, 8);
description = comObj.MarshalCOMVariant(dateArg, out outArg);
Console.WriteLine("VARIANT - date: {0}, {1}, {2}",
dateArg.GetType().Name, outArg.GetType().Name, description);
object objectArg = new object();
description = comObj.MarshalCOMVariant(objectArg, out outArg);
Console.WriteLine("VARIANT - object: {0}, {1}, {2}",
objectArg.GetType().Name, outArg.GetType().Name, description);
object nullArg = null;
description = comObj.MarshalCOMVariant(nullArg, out outArg);
Console.WriteLine("VARIANT - null: {0}, {1}, {2}",
"null", outArg == null ? "null" : outArg.GetType().Name, description);
IntPtr intptrArg = IntPtr.Zero;
description = comObj.MarshalCOMVariant(intptrArg, out outArg);
Console.WriteLine("VARIANT - IntPtr: {0}, {1}, {2}",
intptrArg.GetType().Name, outArg.GetType().Name, description);
}
/// <summary>
/// Intercept method calls
/// </summary>
/// <param name="myMessage">
/// Contains information about the method being called
/// </param>
/// <returns>
/// A <see cref="ReturnMessage"/>.
/// </returns>
public override IMessage Invoke(IMessage myMessage)
{
IMethodCallMessage callMessage = myMessage as IMethodCallMessage;
if (null == callMessage)
{
Debug.WriteLine("Message type not implemented: " + myMessage.GetType().ToString());
return null;
}
MethodInfo method = callMessage.MethodBase as MethodInfo;
if (null == method)
{
Debug.WriteLine("Unrecognized Invoke call: " + callMessage.MethodBase.ToString());
return null;
}
object returnValue = null;
object[] outArgs = null;
int outArgsCount = 0;
string methodName = method.Name;
Type returnType = method.ReturnType;
BindingFlags flags = BindingFlags.InvokeMethod;
int argCount = callMessage.ArgCount;
object invokeObject;
Type invokeType;
Type byValType;
object[] args;
object arg;
COMWrapper[] originalArgs;
COMWrapper wrapper;
ParameterModifier[] argModifiers = null;
ParameterInfo[] parameters = null;
ParameterInfo parameter;
if ("Dispose" == methodName && 0 == argCount && typeof(void) == returnType)
{
this.Dispose();
}
else if ("ToString" == methodName && 0 == argCount && typeof(string) == returnType)
{
returnValue = this.ToString();
}
else if ("GetType" == methodName && 0 == argCount && typeof(System.Type) == returnType)
{
returnValue = this._InterceptType;
}
else if ("GetHashCode" == methodName && 0 == argCount && typeof(int) == returnType)
{
returnValue = this.GetHashCode();
}
else if ("Equals" == methodName && 1 == argCount && typeof(bool) == returnType)
{
returnValue = this.Equals(callMessage.Args[0]);
}
else if (1 == argCount && typeof(void) == returnType
&& (methodName.StartsWith("add_") || methodName.StartsWith("remove_")))
{
bool removeHandler = methodName.StartsWith("remove_");
methodName = methodName.Substring(removeHandler ? 7 : 4);
Delegate handler = callMessage.InArgs[0] as Delegate;
if (null == handler)
return new ReturnMessage(new ArgumentNullException("handler"), callMessage);
try
{
if (removeHandler)
RemoveEventHandler(methodName, handler);
else
AttachEventHandler(methodName, handler);
}
catch (Exception ex)
{
return new ReturnMessage(ex, callMessage);
}
}
else
{
invokeObject = this._COMObject;
invokeType = this._COMType;
if (methodName.StartsWith("get_"))
{
// Property Get
methodName = methodName.Substring(4);
flags = BindingFlags.GetProperty;
args = callMessage.InArgs;
}
else if (methodName.StartsWith("set_"))
{
// Property Set
methodName = methodName.Substring(4);
flags = BindingFlags.SetProperty;
args = callMessage.InArgs;
}
else
{
args = callMessage.Args;
if (null != args && 0 != args.Length)
{
// Modifiers for ref / out parameters
argModifiers = new ParameterModifier[1];
argModifiers[0] = new ParameterModifier(args.Length);
parameters = method.GetParameters();
for (int i = 0; i < parameters.Length; i++)
{
parameter = parameters[i];
if (parameter.IsOut || parameter.ParameterType.IsByRef)
{
argModifiers[0][i] = true;
outArgsCount++;
}
}
if (0 == outArgsCount) argModifiers = null;
}
}
// Un-wrap wrapped COM objects before passing to the method
if (null == args || 0 == args.Length)
{
originalArgs = null;
}
else
{
originalArgs = new COMWrapper[args.Length];
for (int i = 0; i < args.Length; i++)
{
if (null != args[i] && RemotingServices.IsTransparentProxy(args[i]))
{
wrapper = RemotingServices.GetRealProxy(args[i]) as COMWrapper;
if (null != wrapper)
{
originalArgs[i] = wrapper;
args[i] = wrapper._COMObject;
}
}
else if (0 != outArgsCount && argModifiers[0][i])
{
byValType = GetByValType(parameters[i].ParameterType);
if (byValType.IsInterface)
{
// If we're passing a COM object by reference, and
// the parameter is null, we need to pass a
// DispatchWrapper to avoid a type mismatch exception.
if (null == args[i]) args[i] = new DispatchWrapper(null);
}
else if (typeof(Decimal) == byValType)
{
// If we're passing a decimal value by reference,
// we need to pass a CurrencyWrapper to avoid a
// type mismatch exception.
// http://support.microsoft.com/?kbid=837378
args[i] = new CurrencyWrapper(args[i]);
}
}
}
}
try
{
returnValue = invokeType.InvokeMember(methodName,
flags, null, invokeObject, args, argModifiers, null, null);
}
catch (Exception ex)
{
return new ReturnMessage(ex, callMessage);
}
// Handle enum and interface return types
if (null != returnValue)
{
if (returnType.IsInterface)
{
// Wrap the returned value in an intercepting COM wrapper
if (Marshal.IsComObject(returnValue))
returnValue = COMWrapper.Wrap(returnValue, returnType);
}
else if (returnType.IsEnum)
{
// Convert to proper Enum type
returnValue = Enum.Parse(returnType, returnValue.ToString());
}
}
// Handle out args
if (0 != outArgsCount)
{
outArgs = new object[args.Length];
for (int i = 0; i < parameters.Length; i++)
{
if (!argModifiers[0][i]) continue;
arg = args[i];
if (null == arg) continue;
parameter = parameters[i];
wrapper = null;
byValType = GetByValType(parameter.ParameterType);
if (typeof(Decimal) == byValType)
{
if (arg is CurrencyWrapper) arg = ((CurrencyWrapper)arg).WrappedObject;
}
else if (byValType.IsEnum)
{
arg = Enum.Parse(byValType, arg.ToString());
}
else if (byValType.IsInterface)
{
if (Marshal.IsComObject(arg))
{
wrapper = originalArgs[i];
if (null != wrapper && wrapper._COMObject != arg)
{
wrapper.Dispose();
wrapper = null;
}
if (null == wrapper) wrapper = new COMWrapper(arg, byValType);
arg = wrapper.GetTransparentProxy();
}
}
outArgs[i] = arg;
}
}
}
return new ReturnMessage(returnValue,
outArgs, outArgsCount,
callMessage.LogicalCallContext,
callMessage);
}
public string MarshalVariantCurrencyWrapper(object inArg, ref object outArg)
{
outArg = new CurrencyWrapper(inArg);
return inArg.GetType().Name;
}
