error:c2664:cannot convert parameter 1 from 'const char *' to 'unsigned short ** '

[With_problem]

i am using this dll function to insert data in database but it give me following error...how to slove this can anybody there help me setQuoteToDB(Timestamp,a,Market,Bid,Ask,d); Error:cannot convert parameter 1 from 'const char *' to 'unsigned short ** '

[Cedric Moonen]

It would be nice to explain your problem a litle bit better (and also to post some code to show how you are using the function). To me the error is clear: you pass a pointer to a char array and the function needs an unsigned short** instead.

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Cédric Moonen Software developer
Charting control [v1.1]

[With_problem]

this is my code....can you just tell me how to convert it....this is dll function... m_MainEdit=m_MainEdit + "" +" " + SessionId + "\t" + RequestId +"\t"+ a ; m_MainEdit=m_MainEdit + "\t"+ Market + "\t " + Bid + "\t " + b + " \t"+ Ask + "\t" +c +"\t "+ High + "\t"; m_MainEdit=m_MainEdit + Low + "\t" + d + " "+ "\t" + Timestamp + "\r\n"; UpdateData(FALSE); iLineCount=m_EditCtrl.GetLineCount(); m_EditCtrl.LineScroll(iLineCount); _DBAccess db; db.setQuoteToDB(Timestamp,a,Market,Bid,Ask,d);

[Cedric Moonen]

Geez, you are not very helpfull !! What is the prototype of setQuoteToDB ? And what are the actual parameters that you pass to the function ? What is Timestamp, what is a, what is Market, what is Bid, what is Ask and what is d ? Don't you understand that you are passing a wrong type of parameter to the function ? So how can I help you if you actually don't provide me with the information about what the function is expecting and what you actually pass to the function.

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Cédric Moonen Software developer
Charting control [v1.1]

[Roger Stoltz]

Half of this reply is just guesses from my side since you don't provide much information. There seem to be two problems here: 1. the dll func expects a parameter which is a pointer to a pointer to an 'unsigned short', but you provide it with a pointer to a 'const char'. I suspect the dll func to expect a BSTR* and it's an out-parameter, i.e. you'll get a B-string as a result of the dll func. If this is the case it could look like this:

BSTR bstrTheString = NULL;
setQuoteToDB( ..., &bstrTheString, ...);

Otherwise if it really is an unsigned short:

unsigned short* pMyValue = NULL; // Or where ever it should point
setQuoteToDB( ..., &pMyValue, ...);

2. You're trying to convert a 'const' value to a 'non-const' which in all cases gives a compiler error. By declaring something 'const' you sign a contract where you promise not to change the value. The compiler complains if you're trying to violate that contract by type-casting to a 'non-const' type. Hope this helps -- Roger

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