MC 6.1 (3605) IEasyLanguageObject reference Show Stopper

misterbear · Postby **misterbear** » 26 Sep 2010

In my C++ DLL the following standard TS SDK call is failing to return a pointer to the IEasyLanguageVariable *pVar and instead raises a "bad parameter" error in MC. See code below. I am doing a port of my EasyLanguage code which uses a C++ DLL. The code has been running well for over a year on TS 8.3 thru TS 8.7 The compiler is VisualStudio 2010 Pro

This failure is a show stopper!!! I need a workaround or a patch. Kindly confirm this functionality is supported or not in MC 6.1

Easylanguage snippet simplified. Note: the builtin variable "value9" is defined thus:

Code: Select all

	...

	external: "c:\mystuff.dll", void, "mycalc", IEasyLanguageObject, double ;

	...

	value9 = 0.0 ;

        ...

        mycalc( self, 987.654321 ) ;

	...

        // --------end  of EL code ---------

Example of Easylanguage SDK call failure using Multicharts 6.1 (build 3605)

The following C++ statement fails to return a pointer to a user defined easylanguage variable and instead raises a "bad parameter error"

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	...

	IEasyLanguageVariable *p = pEL->Variables[ "value9" ] ; // this statement fails

	...

For reference this is an excerpt of the failing C++ code

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--------------------------------------------------------

#import "c:\Program Files\TS Support\MultiCharts\PLKit.dll" no_namespace

...

void __stdcall mycalc( IEasyLanguageObject *pEL, double newprice )

	{

        //this statement  immediately fails and raises "bad parameter exception" in MC

	IEasyLanguageVariable *pVar = pEL->Variables["value9"] ; // Fails!



	//execution never gets here

	if ( p ) 

                pVar->AsDouble[0] = newprice ;

 	}

Dave Masalov · Postby **Dave Masalov** » 27 Sep 2010

Dear misterbear,

Everything works normally. Please find attached the C++ Dll with the source code and a .pla archive with the example of the script as well as a screenshot.

misterbear · Postby **misterbear** » 27 Sep 2010

Thanks for the confirming example. Much appreciated

misterbear · Postby **misterbear** » 27 Sep 2010

I have narrowed down the problem further. If i attempt to pass in BarNumber as an argument to the DLL function, I get the runtime parameter error. It does not seem to matter if the arg is type int or double. Passing BarNumber as an arg works in TS but not in MC.

Code: Select all


//======= EL Code =======

external: "c:\mcdll.dll", void, "mycalc", IEasyLanguageObject, string, int ;

value9 = 0.0 ;

mycalc( self, "value9", BarNumber ) ;

Plot1(value9);

It also seems to fail when I indirectly set the BarNumber into a user variable, thus:

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Var: int my_barnum(0) ;

my_barnum = BarNumber ;

...

mycalc( self, "value9", my_barnum ) ;

...

======== C++ DLL function =======

Code: Select all


void __stdcall mycalc( IEasyLanguageObject* pEL, LPCSTR varName, int barnum )

{

	IEasyLanguageVariable *pVar = pEL->Variables[ varName ] ;

	if ( pVar )

		pVar->AsDouble[0] = (double) barnum ;

}

Dave Masalov · Postby **Dave Masalov** » 29 Sep 2010

Dear misterbear,

The engineers have confirmed that it is a bug. It has been added to the fix list.

However, there is a workaround. Make the variable series type, if there are series functions calls. For example:

external: "c:\mcdll.dll", void, "mycalc", IEasyLanguageObject, string, double ;
value9 = 0.0 ;
value1 = value9[1]; // make value9 serial variable
mycalc( self, "value9", BarNumber ) ;
Plot1(value9);

MC 6.1 (3605) IEasyLanguageObject reference Show Stopper

MC 6.1 (3605) IEasyLanguageObject reference Show Stopper

Re: MC 6.1 (3605) IEasyLanguageObject reference Show Stopper

Re: MC 6.1 (3605) IEasyLanguageObject reference Show Stopper

Re: MC 6.1 (3605) IEasyLanguageObject reference Show Stopper

Re: MC 6.1 (3605) IEasyLanguageObject reference Show Stopper