Go4Expert - cannot convert parameter 1 from 'char' to 'const char *'

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cannot convert parameter 1 from 'char' to 'const char *'

Dear Experts,

I am stuck up with a piece of code, which I am not able to break. Could you kindly help me out.

Situation:
I am trying to perform a string comparison between 2 variables, one defined as const TCHAR * and other defined as CS_CHAR, inside an Embedded SQL program in C++. My relevant code snippet is as below:

Code:

short CSQLBox::fnTest(const TCHAR *varInput)

{

  CS_CHAR szExtract;

  

  //szExtract variable is populated by Embedded SQL query

  ....



  //Do string comparison

  if(strcmp(szExtract, varInput)==0)

  {

    ...

  }

}

When I try to compile this code, the strcmp step is throwing an error "cannot convert parameter 1 from 'char' to 'const char *'".

I have tried typecasting parameter 1 as:

Code:

if(strcmp((const char*)szExtract, varInput)==0)

This way, the code compiles, but fails in runtime with unhandled exception error. I am unable to understand how to solve this issue.

Could anyone kindly offer me some suggestions.

cheers,
sanK

Re: cannot convert parameter 1 from 'char' to 'const char *'

Perhaps you should tell us what a CS_CHAR is. I'm not up to Googling it. Since you're using it, you should know.

Re: cannot convert parameter 1 from 'char' to 'const char *'

Hello DaWei,

My code snippet belongs to an Embedded SQL file in C++. CS_CHAR is a character datatype used in Embedded SQL with Sybase and is declared within a EXEC SQL block. The actual code goes like this:

Code:

short CSQLBox::fnTest(const TCHAR *varInput)

{

  exec sql begin declare section;

  CS_CHAR szExtract[10];

  exec sql end declare section;

    

  szExtract[0] = _T('\0');



  //szExtract array is populated by Embedded SQL query

  ....



  //Do string comparison

  for( int j=0; j<5; j++)

  {

      if(strcmp(szExtract, varInput)==0)

      {

         ...

      }

  }

}

cheers,
sanK

Re: cannot convert parameter 1 from 'char' to 'const char *'

Your first example has "CS_CHAR szExtract;"

Your second example has "CS_CHAR szExtract [10];"

That's a fundamental difference. The first is a char, the second is a char*. You cannot reconcile that with a cast. Make sure you declare an array of char, not just one char.