Need help with C++ string parasing and general help, help me please :)

[Eric_B]

Here are my few questions:
1. What are the equalent version of Goto, Exit Sub/function, and select case?

2. How can I pass the state of a checkbox to c++ dll function ( like chk.Value = 1)?

3. Can anyone explain whats going on in this code step by step please.
void _stdcall ReverseString( BSTR a )
{
int i, iLen;
BSTR b;
LPSTR pA, pB;

iLen = strlen( (LPCSTR)a );
b = SysAllocStringLen( NULL, iLen );

pA = (LPSTR)a;
pB = (LPSTR)b + iLen -1;

for ( i = 0; i < iLen; i++ )
*pB-- = *pA++;

pA = (LPSTR)a;
pB = (LPSTR)b;

for ( i = 0; i < iLen; i++ )
*pA++ = *pB++;

SysFreeString( b );
}

4. Whats the bug in CString. And what is meant by C style string?

Thanx in advance!

[PsyVision]

a select case (as known in vb) is a switch statment in C++

int nNumber;

switch (nNumber) {
    case 0: {
        // Do Whatever
        break;
    }
    case 1: {
        // Do Whatever
        break;
    }  
}

[jim mcnamara]

void _stdcall ReverseString( BSTR a ) 
{ 
   int i, iLen; 
  BSTR b; 
  LPSTR pA, pB;   string pointers

  iLen = strlen( (LPCSTR)a );   how long is the a string
  // i'd add this line here if(iLen <2) return;  -- don't mess if only  1 or zero chars
  b = SysAllocStringLen( NULL, iLen );  create b memory for b - same length as a

   pA = (LPSTR)a;         pA points to start of a string
   pB = (LPSTR)b + iLen -1;   pB points to end of b (currently empty)

    for ( i = 0; i < iLen; i++ )  each char from a -> b backwards
      *pB-- = *pA++; 

   pA = (LPSTR)a;  reset pointer to the start of strings
   pB = (LPSTR)b; 

   for ( i = 0; i < iLen; i++ )  copy b to a char by char
      *pA++ = *pB++; 

    SysFreeString( b );  free memory allocated for b earlier

the 'a' string now is reversed.
} 

[crptcblade]

Exit Sub/Function in VB = return in C/C++.

if the return type of the function is void, then no return value needs to be specified, otherwise you need to return a value of the specified type.

[parksie]

4. The bug in CString was a repeated-allocation memory leak. It has since been fixed Incidentally, some RogueWave implementations of the standard library string class had the same type of bug.

CString is MFC
string is from the Standard C++ Library
A "C Style" string is merely an array with a NULL at the end of it to show where the string ends.

[Eric_B]

thanx for the help u guys are great!

There is another question

cpp file:
MYTESTDLLEXIM void _stdcall StrTest( char* FirstParam, char* SecondParam )
{
strcat(FirstParam,SecondParam);
}

def file:
StrTest @3


Giving me bad calling convention or something

I'm trying to make an string function.

Thanx in advance!