How I Can Calling Com Object Multiple Time

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i want to call function in matlab from c# inside for loop using com component
when i tried it i had this exception

Invalid callee. (Exception from HRESULT: 0x80020010 (DISP_E_BADCALLEE))

this is the code

C#

for (int j = 1; j < 8; j++)
            {               
                object result1;
                string name = path + j + ".JPG";
                matlab.Feval("WBC_SegProposed", 6, out result1, name, 0, j);
           ...........//code
}

the exception was for this instruction " matlab.Feval("WBC_SegProposed", 6, out result1, name, 0, j);"
what should i do ?

Posted 10-Jul-14 13:41pm

Esraa Saady

Updated 10-Feb-19 5:24am

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Comments

Sergey Alexandrovich Kryukov 10-Jul-14 22:03pm

There is no such concept, "call a control". You can call a method or a property getter/setter, but it does not matter how many times...
—SA

Esraa Saady 11-Jul-14 10:49am

but it gave me exception, why ?

Sergey Alexandrovich Kryukov 11-Jul-14 13:00pm

Hard to say, from this information. Do you have exact exception type, message, stack, as well as the same for InnerException?
—SA

George Jonsson 10-Jul-14 22:47pm

Do you get this error the first time in the loop?

Esraa Saady 11-Jul-14 10:50am

No at the second time in it

George Jonsson 11-Jul-14 11:10am

I think you need to show the whole loop.
The error is most likely because of something you are doing after the code you are showing.
People in this forum us good, but most of us don't have a crystal ball.

Esraa Saady 11-Jul-14 11:33am

i don't find "edit" so i posted new question with the code

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Member 14145676 · Answer 1 · 2019-02-10T05:24:00

Hi,
I'm sad to see all the unhelpful comments above when it is really Mathwork's poor implementation leading to this error. The solution is to simply include result = null in your for loop:

C#

for (int j = 1; j < 8; j++)
            {               
                object result1 = null; // <---resetting result back to null
                string name = path + j + ".JPG";
                matlab.Feval("WBC_SegProposed", 6, out result1, name, 0, j);
           ...........//code
}

your code works for the first iteration because "result" is set to null by default. Then it gets assigned a value in the first iteration and Feval throws an error due to passing a non-null variable in the second iteration.