TypeErrorException was unhandled IronPython
Question: I have a script written in python, that I am invoking using IronPython from
C#. But I run into an exception as soon as I call a method, and it throws as
exception.

This is the script that I am invoking:

    
    
    import sys
    import ctypes
    
    class EAHashingAlgorithm():
    
    def __init__(self):
        # shift amounts in each round
        self.r1Shifts = [ 7, 12, 17, 22, 7, 12, 17, 22, 7, 12, 17, 22, 7, 12, 17, 22 ]
        self.r2Shifts = [ 5, 9, 14, 20, 5, 9, 14, 20, 5, 9, 14, 20, 5, 9, 14, 20 ]
        self.r3Shifts = [ 4, 11, 16, 23, 4, 11, 16, 23, 4, 11, 16, 23, 4, 11, 16, 23 ]
        self.r4Shifts = [ 6, 10, 15, 21, 6, 10, 15, 21, 6, 10, 15, 21, 6, 10, 15, 21 ]
    
        self.hexChars = "0123456789abcdef"
    
    def zero_fill_right_shit(self, data, bits):
        return (data & 0xffffffff) >> bits
    
    def num2hex(self, num):
        '''
            Convert a decimal number to hexadecimal
        '''
        temp = ''
        for i in range(0, 4):
            x = self.hexChars[ ( num >> (i * 8 + 4) ) & 0x0F ]
            y = self.hexChars[ ( num >> (i * 8) ) & 0x0F ]
            temp += (x + y)
    
        return temp
    
    def chunkMessage(self, string):
        # TODO: ctypes.c_int32() in this method
        nblk = (( len(string) + 8) >> 6) + 1
        blks = [0] * (nblk * 16)
    
        for i in range(0, len(string)):
            blks[i >> 2] |= ord(string[i]) << ((i % 4) * 8)
    
        i = i + 1
    
        blks[i >> 2] |= 0x80 << ((i % 4) * 8)
        blks[nblk * 16 - 2] = len(string) * 8
    
        return blks
    
    def add(self, x, y):
        lsw = (x & 0xFFFF) + (y & 0xFFFF)
        msw = (ctypes.c_int32(x >> 16).value) + (ctypes.c_int32(y >> 16).value) + (ctypes.c_int32(lsw >> 16).value)
        return ctypes.c_int32( (ctypes.c_int32(msw << 16).value) | (lsw & 0xFFFF) ).value
    
    # Bitwise rotate 32bit num to left
    def bitwiseRotate(self, x, c):
        return ctypes.c_int32( ctypes.c_int32(x << c).value | self.zero_fill_right_shit(x, 32 - c) ).value
    
    # Basic MD5 operations
    def cmn(self, q, a, b, x, s, t):
        z1 = self.add(a, q)
        z2 = self.add(x, t) 
        a1 = self.add(z1, z2)
    
        x1 = self.bitwiseRotate(a1, s)
        return self.add(x1, b)
    
    def md5_f(self, a, b, c, d, x, s, t):
        return self.cmn( ctypes.c_int32((b & c) | ((~b) & d)).value, a, b, x, s, t )
    
    def md5_g(self, a, b, c, d, x, s, t):
        return self.cmn( ctypes.c_int32((b & d) | (c & (~d))).value, a, b, x, s, t )
    
    def md5_h(self, a, b, c, d, x, s, t):
        return self.cmn( ctypes.c_int32(b ^ c ^ d).value, a, b, x, s, t )
    
    def md5_i(self, a, b, c, d, x, s, t):
        return self.cmn( ctypes.c_int32(c ^ (b | (~d))).value, a, b, x, s, t )
    
    def EAHash(self, string):
        x = self.chunkMessage(string)
    
        a = 1732584193
        b = -271733879
        c = -1732584194
        d = 271733878
    
        for i in range(0, 16, 16):
            tempA = a
            tempB = b
            tempC = c
            tempD = d
    
            # F
            a = self.md5_f(a, b, c, d, x[i+0], self.r1Shifts[0], -680876936)
            d = self.md5_f(d, a, b, c, x[i+1], self.r1Shifts[1], -389564586)
            c = self.md5_f(c, d, a, b, x[i+2], self.r1Shifts[2], 606105819)
            b = self.md5_f(b, c, d, a, x[i+3], self.r1Shifts[3], -1044525330)
    
            a = self.md5_f(a, b, c, d, x[i+4], self.r1Shifts[4], -176418897)
            d = self.md5_f(d, a, b, c, x[i+5], self.r1Shifts[5], 1200080426)
            c = self.md5_f(c, d, a, b, x[i+6], self.r1Shifts[6], -1473231341)
            b = self.md5_f(b, c, d, a, x[i+7], self.r1Shifts[7], -45705983)
    
            a = self.md5_f(a, b, c, d, x[i+8], self.r1Shifts[8], 1770035416)
            d = self.md5_f(d, a, b, c, x[i+9], self.r1Shifts[9], -1958414417)
            c = self.md5_f(c, d, a, b, x[i+10], self.r1Shifts[10], -42063)
            b = self.md5_f(b, c, d, a, x[i+11], self.r1Shifts[11], -1990404162)
    
            a = self.md5_f(a, b, c, d, x[i+12], self.r1Shifts[12], 1804603682)
            d = self.md5_f(d, a, b, c, x[i+13], self.r1Shifts[13], -40341101)
            c = self.md5_f(c, d, a, b, x[i+14], self.r1Shifts[14], -1502002290)
            b = self.md5_f(b, c, d, a, x[i+15], self.r1Shifts[15], 1236535329)
    
            # G
            a = self.md5_g(a, b, c, d, x[i+1], self.r2Shifts[0], -165796510)
            d = self.md5_g(d, a, b, c, x[i+6], self.r2Shifts[1], -1069501632)
            c = self.md5_g(c, d, a, b, x[i+11], self.r2Shifts[2], 643717713)
            b = self.md5_g(b, c, d, a, x[i+0], self.r2Shifts[3], -373897302)
    
            a = self.md5_g(a, b, c, d, x[i+5], self.r2Shifts[4], -701558691)
            d = self.md5_g(d, a, b, c, x[i+10], self.r2Shifts[5], 38016083)
            c = self.md5_g(c, d, a, b, x[i+15], self.r2Shifts[6], -660478335)
            b = self.md5_g(b, c, d, a, x[i+4], self.r2Shifts[7], -405537848)
    
            a = self.md5_g(a, b, c, d, x[i+9], self.r2Shifts[8], 568446438)
            d = self.md5_g(d, a, b, c, x[i+14], self.r2Shifts[9], -1019803690)
            c = self.md5_g(c, d, a, b, x[i+3], self.r2Shifts[10], -187363961)
            b = self.md5_g(b, c, d, a, x[i+8], self.r2Shifts[11], 1163531501)
    
            a = self.md5_g(a, b, c, d, x[i+13], self.r2Shifts[12], -1444681467)
            d = self.md5_g(d, a, b, c, x[i+2], self.r2Shifts[13], -51403784)
            c = self.md5_g(c, d, a, b, x[i+7], self.r2Shifts[14], 1735328473)
            b = self.md5_g(b, c, d, a, x[i+12], self.r2Shifts[15], -1926607734)
    
            # H
            a = self.md5_h(a, b, c, d, x[i+5], self.r3Shifts[0], -378558)
            d = self.md5_h(d, a, b, c, x[i+8], self.r3Shifts[1], -2022574463)
            # line below uses self.r2Shifts[2] where as MD5 would use self.r3Shifts[2]
            c = self.md5_h(c, d, a, b, x[i+11], self.r2Shifts[2], 1839030562)
            b = self.md5_h(b, c, d, a, x[i+14], self.r3Shifts[3], -35309556)
    
            a = self.md5_h(a, b, c, d, x[i+1], self.r3Shifts[4], -1530992060)
            d = self.md5_h(d, a, b, c, x[i+4], self.r3Shifts[5], 1272893353)
            c = self.md5_h(c, d, a, b, x[i+7], self.r3Shifts[6], -155497632)
            b = self.md5_h(b, c, d, a, x[i+10], self.r3Shifts[7], -1094730640)
    
            a = self.md5_h(a, b, c, d, x[i+13], self.r3Shifts[8], 681279174)
            d = self.md5_h(d, a, b, c, x[i+0], self.r3Shifts[9], -358537222)
            c = self.md5_h(c, d, a, b, x[i+3], self.r3Shifts[10], -722521979)
            b = self.md5_h(b, c, d, a, x[i+6], self.r3Shifts[11], 76029189)
    
            a = self.md5_h(a, b, c, d, x[i+9], self.r3Shifts[12], -640364487)
            d = self.md5_h(d, a, b, c, x[i+12], self.r3Shifts[13], -421815835)
            c = self.md5_h(c, d, a, b, x[i+15], self.r3Shifts[14], 530742520)
            b = self.md5_h(b, c, d, a, x[i+2], self.r3Shifts[15], -995338651)
    
            # I
            a = self.md5_i(a, b, c, d, x[i+0], self.r4Shifts[0], -198630844)
            d = self.md5_i(d, a, b, c, x[i+7], self.r4Shifts[1], 1126891415)
            c = self.md5_i(c, d, a, b, x[i+14], self.r4Shifts[2], -1416354905)
            b = self.md5_i(b, c, d, a, x[i+5], self.r4Shifts[3], -57434055)
    
            a = self.md5_i(a, b, c, d, x[i+12], self.r4Shifts[4], 1700485571)
            d = self.md5_i(d, a, b, c, x[i+3], self.r4Shifts[5], -1894986606)
            c = self.md5_i(c, d, a, b, x[i+10], self.r4Shifts[6], -1051523)
            b = self.md5_i(b, c, d, a, x[i+1], self.r4Shifts[7], -2054922799)
    
            a = self.md5_i(a, b, c, d, x[i+8], self.r4Shifts[8], 1873313359)
            d = self.md5_i(d, a, b, c, x[i+15], self.r4Shifts[9], -30611744)
            c = self.md5_i(c, d, a, b, x[i+6], self.r4Shifts[10], -1560198380)
            b = self.md5_i(b, c, d, a, x[i+13], self.r4Shifts[11], 1309151649)
    
            a = self.md5_i(a, b, c, d, x[i+4], self.r4Shifts[12], -145523070)
            d = self.md5_i(d, a, b, c, x[i+11], self.r4Shifts[13], -1120210379)
            c = self.md5_i(c, d, a, b, x[i+2], self.r4Shifts[14], 718787259)
            b = self.md5_i(b, c, d, a, x[i+9], self.r4Shifts[15], -343485551)
            # This line is doubled for some reason, line below is not in the MD5 version
            b = self.md5_i(b, c, d, a, x[i+ 9], self.r4Shifts[15], -343485551)
    
            a = self.add(a, tempA)
            b = self.add(b, tempB)
            c = self.add(c, tempC)
            d = self.add(d, tempD)
    
        return self.num2hex(a) + self.num2hex(b) + self.num2hex(c) + self.num2hex(d)
    

This is how I invoke the method in the class:

    
    
    ScriptSource source = engine.CreateScriptSourceFromFile("EAHashingAlgorithm.py");
            ScriptScope scope = engine.CreateScope();
            engine.SetSearchPaths(new[] { "C:/Program Files (x86)/IronPython 2.7/Lib" });
            source.Execute(scope);
    
            dynamic eaHash = scope.GetVariable("EAHashingAlgorithm");
            dynamic hash = eaHash();
            this.answer = hash.EAHash(_answer); //lets suppose the answer is "123456"
    

It throws the following exception:

    
    
    expected signed long, got long
    

This is the stacktrace:

    
    
    at IronPython.Modules.ModuleOps.GetSignedLong(Object value, Object type)
       at IronPython.Modules.CTypes.SimpleType.IronPython.Modules.CTypes.INativeType.SetValue(MemoryHolder owner, Int32 offset, Object value)
       at IronPython.Modules.CTypes.SimpleCData.__init__(Object value)
       at CallSite.Target(Closure , CallSite , CodeContext , Object , Object )
       at System.Dynamic.UpdateDelegates.UpdateAndExecute3[T0,T1,T2,TRet](CallSite site, T0 arg0, T1 arg1, T2 arg2)
       at Microsoft.Scripting.Interpreter.DynamicInstruction`4.Run(InterpretedFrame frame)
       at Microsoft.Scripting.Interpreter.Interpreter.Run(InterpretedFrame frame)
       at Microsoft.Scripting.Interpreter.LightLambda.Run4[T0,T1,T2,T3,TRet](T0 arg0, T1 arg1, T2 arg2, T3 arg3)
       at System.Dynamic.UpdateDelegates.UpdateAndExecute3[T0,T1,T2,TRet](CallSite site, T0 arg0, T1 arg1, T2 arg2)
       at Microsoft.Scripting.Interpreter.DynamicInstruction`4.Run(InterpretedFrame frame)
       at Microsoft.Scripting.Interpreter.Interpreter.Run(InterpretedFrame frame)
       at Microsoft.Scripting.Interpreter.LightLambda.Run4[T0,T1,T2,T3,TRet](T0 arg0, T1 arg1, T2 arg2, T3 arg3)
       at IronPython.Compiler.PythonCallTargets.OriginalCallTarget3(PythonFunction function, Object arg0, Object arg1, Object arg2)
       at IronPython.Runtime.FunctionCaller`3.Call3(CallSite site, CodeContext context, Object func, T0 arg0, T1 arg1, T2 arg2)
       at IronPython.Runtime.Method.MethodBinding`2.SelfTarget(CallSite site, CodeContext context, Object target, T0 arg0, T1 arg1)
       at System.Dynamic.UpdateDelegates.UpdateAndExecute4[T0,T1,T2,T3,TRet](CallSite site, T0 arg0, T1 arg1, T2 arg2, T3 arg3)
       at Microsoft.Scripting.Interpreter.DynamicInstruction`5.Run(InterpretedFrame frame)
       at Microsoft.Scripting.Interpreter.Interpreter.Run(InterpretedFrame frame)
       at Microsoft.Scripting.Interpreter.LightLambda.Run8[T0,T1,T2,T3,T4,T5,T6,T7,TRet](T0 arg0, T1 arg1, T2 arg2, T3 arg3, T4 arg4, T5 arg5, T6 arg6, T7 arg7)
       at IronPython.Compiler.PythonCallTargets.OriginalCallTarget7(PythonFunction function, Object arg0, Object arg1, Object arg2, Object arg3, Object arg4, Object arg5, Object arg6)
       at IronPython.Runtime.FunctionCaller`7.Call7(CallSite site, CodeContext context, Object func, T0 arg0, T1 arg1, T2 arg2, T3 arg3, T4 arg4, T5 arg5, T6 arg6)
       at System.Dynamic.UpdateDelegates.UpdateAndExecute9[T0,T1,T2,T3,T4,T5,T6,T7,T8,TRet](CallSite site, T0 arg0, T1 arg1, T2 arg2, T3 arg3, T4 arg4, T5 arg5, T6 arg6, T7 arg7, T8 arg8)
       at IronPython.Runtime.Method.MethodBinding`6.SelfTarget(CallSite site, CodeContext context, Object target, T0 arg0, T1 arg1, T2 arg2, T3 arg3, T4 arg4, T5 arg5)
       at System.Dynamic.UpdateDelegates.UpdateAndExecute8[T0,T1,T2,T3,T4,T5,T6,T7,TRet](CallSite site, T0 arg0, T1 arg1, T2 arg2, T3 arg3, T4 arg4, T5 arg5, T6 arg6, T7 arg7)
       at Microsoft.Scripting.Interpreter.DynamicInstruction`9.Run(InterpretedFrame frame)
       at Microsoft.Scripting.Interpreter.Interpreter.Run(InterpretedFrame frame)
       at Microsoft.Scripting.Interpreter.LightLambda.Run9[T0,T1,T2,T3,T4,T5,T6,T7,T8,TRet](T0 arg0, T1 arg1, T2 arg2, T3 arg3, T4 arg4, T5 arg5, T6 arg6, T7 arg7, T8 arg8)
       at IronPython.Compiler.PythonCallTargets.OriginalCallTarget8(PythonFunction function, Object arg0, Object arg1, Object arg2, Object arg3, Object arg4, Object arg5, Object arg6, Object arg7)
       at IronPython.Runtime.FunctionCaller`8.Call8(CallSite site, CodeContext context, Object func, T0 arg0, T1 arg1, T2 arg2, T3 arg3, T4 arg4, T5 arg5, T6 arg6, T7 arg7)
       at System.Dynamic.UpdateDelegates.UpdateAndExecute10[T0,T1,T2,T3,T4,T5,T6,T7,T8,T9,TRet](CallSite site, T0 arg0, T1 arg1, T2 arg2, T3 arg3, T4 arg4, T5 arg5, T6 arg6, T7 arg7, T8 arg8, T9 arg9)
       at IronPython.Runtime.Method.MethodBinding`7.SelfTarget(CallSite site, CodeContext context, Object target, T0 arg0, T1 arg1, T2 arg2, T3 arg3, T4 arg4, T5 arg5, T6 arg6)
       at System.Dynamic.UpdateDelegates.UpdateAndExecute9[T0,T1,T2,T3,T4,T5,T6,T7,T8,TRet](CallSite site, T0 arg0, T1 arg1, T2 arg2, T3 arg3, T4 arg4, T5 arg5, T6 arg6, T7 arg7, T8 arg8)
       at Microsoft.Scripting.Interpreter.DynamicInstruction`10.Run(InterpretedFrame frame)
       at Microsoft.Scripting.Interpreter.Interpreter.Run(InterpretedFrame frame)
       at Microsoft.Scripting.Interpreter.LightLambda.Run3[T0,T1,T2,TRet](T0 arg0, T1 arg1, T2 arg2)
       at IronPython.Compiler.PythonCallTargets.OriginalCallTarget2(PythonFunction function, Object arg0, Object arg1)
       at IronPython.Runtime.FunctionCaller`2.Call2(CallSite site, CodeContext context, Object func, T0 arg0, T1 arg1)
       at System.Dynamic.UpdateDelegates.UpdateAndExecute4[T0,T1,T2,T3,TRet](CallSite site, T0 arg0, T1 arg1, T2 arg2, T3 arg3)
       at CallSite.Target(Closure , CallSite , Object , String )
       at System.Dynamic.UpdateDelegates.UpdateAndExecute2[T0,T1,TRet](CallSite site, T0 arg0, T1 arg1)
       at CallSite.Target(Closure , CallSite , Object , String )
       at System.Dynamic.UpdateDelegates.UpdateAndExecute2[T0,T1,TRet](CallSite site, T0 arg0, T1 arg1)
       at FUTBuyer.FUT.ConnectFUT.work(String _uname, String _password, String _answer, String _platform) in E:\Projects\FUTBuyer\FUTBuyer\FUT\ConnectFUT.cs:line 214
       at FUTBuyer.FUT.ConnectFUT..ctor(String userName, String password, String secretAnswer, String platform) in E:\Projects\FUTBuyer\FUTBuyer\FUT\ConnectFUT.cs:line 58
       at FUTBuyer.Form1.button1_Click(Object sender, EventArgs e) in E:\Projects\FUTBuyer\FUTBuyer\Form1.cs:line 21
       at System.Windows.Forms.Control.OnClick(EventArgs e)
       at System.Windows.Forms.Button.OnClick(EventArgs e)
       at System.Windows.Forms.Button.OnMouseUp(MouseEventArgs mevent)
       at System.Windows.Forms.Control.WmMouseUp(Message& m, MouseButtons button, Int32 clicks)
       at System.Windows.Forms.Control.WndProc(Message& m)
       at System.Windows.Forms.ButtonBase.WndProc(Message& m)
       at System.Windows.Forms.Button.WndProc(Message& m)
       at System.Windows.Forms.Control.ControlNativeWindow.OnMessage(Message& m)
       at System.Windows.Forms.Control.ControlNativeWindow.WndProc(Message& m)
       at System.Windows.Forms.NativeWindow.DebuggableCallback(IntPtr hWnd, Int32 msg, IntPtr wparam, IntPtr lparam)
       at System.Windows.Forms.UnsafeNativeMethods.DispatchMessageW(MSG& msg)
       at System.Windows.Forms.Application.ComponentManager.System.Windows.Forms.UnsafeNativeMethods.IMsoComponentManager.FPushMessageLoop(IntPtr dwComponentID, Int32 reason, Int32 pvLoopData)
       at System.Windows.Forms.Application.ThreadContext.RunMessageLoopInner(Int32 reason, ApplicationContext context)
       at System.Windows.Forms.Application.ThreadContext.RunMessageLoop(Int32 reason, ApplicationContext context)
       at System.Windows.Forms.Application.Run(Form mainForm)
       at FUTBuyer.Program.Main() in E:\Projects\FUTBuyer\FUTBuyer\Program.cs:line 18
       at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args)
       at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
       at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
       at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean ignoreSyncCtx)
       at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
       at System.Threading.ThreadHelper.ThreadStart()
    

The code runs fine when run using python alone. I am using IronPython, version
2.7.3..Help anyone?


Answer: The problem seems to emerge from how IronPython's `ctypes.c_int32` handles
long values greater than the maximum integer value. This could either be a
general difference in the run-time or the ctypes implementation.

In order to achieve the same behavior as in CPython (as a workaround), you
would have to ensure that no argument larger than the max integer size is
passed into c_int32. But looking at your code this is probably not what you
want, because you seem to call c_int32 just for the very reason to truncate
shift results flowing into the long range.

Have you considered masking instead of c_int32? This might have performance
implications but that depends on your use-case/algorithm. Instead of

    
    
    ctypes.c_int32(x).value
    

you could

    
    
    x & 0xffffffff
    

and your results should remain the same.

To be sure you could [file a
bug](http://ironpython.codeplex.com/workitem/list/basic) with IronPython which
is probably your best chance of finding out why IronPython behaves different
to CPython.

