Run time error 49

[HyperEngineer]

This is a strange problem. If I run the VB6 program from the IDE it generates a run time error 49, bad DLL calling convention. However, if I compile the VB6 program and run the .exe file it does not generate the error.

The VB declare statement in a module:

Public Declare Function LogOnToTelnet(ByVal cIP As String,
                                      ByVal iPort As Integer,
                                      ByVal cPrompt As String,
                                      ByVal cUsername As String,
                                      ByVal cPassword As String) As Integer

The calling statement in a form (which generates the error):

iRet = LogInToTelnet(cIP, iPort, cPrompt, cUsername, cPassword)

And the function in VC++6

extern "C" DLLexport int LogInToTelnet(char* cIP,
                                       int   nPort,
                                       char* cPrompt,
                                       char* cUsername
                                       cahr* cPassword)
{

 .....

}

Any ideas on this one?

thanks,

HyperEngineer
If it ain't broke, it probably needs improvement.

 

[SBerthold]

Try using long integers

 

[HyperEngineer]

Nope. Long integers did not work. Even so, why would the compiled VB6 work but not from the IDE?

HyperEngineer
If it ain't broke, it probably needs improvement.

 

[genomon]

Is this a typo?

cahr* cPassword

If not change to char....

Money can't buy happiness -- but somehow it's more comfortable to cry in a Corvette than in a Yugo.

 

[HyperEngineer]

Sorry, it was a typo. I do have some new info. If I call the function in the DLL without any parameters, it does go to the DLL function and I get a return. This is without changing the DLL. That means if I do nothing to the DLL, but at the VB end I change the declare statement to reflect no parameters and make the call with no parameters, the DLL function is called and it returns a value based on nothing coming in. What does the IDE do that is different from the compiled exe file?

HyperEngineer
If it ain't broke, it probably needs improvement.