C / C++ / MFC

si_69 wrote:

What would be the best way to convert a CString value of say "C-YOu01"

to a numerical value ?

std::string str = "C-YOu01";
int nVal = 0;
 
for (int x = 0; x < str.length(); x++)
{
    int c = str[x] - 48;
    nVal += c;
}
 
std::cout << nVal << std::endl;

int nVal;
nVal = strlen("C-YOu01");
printf("%d\n");

Electronic75 wrote:

When one defines a pointer [...] it is not null then

Electronic75 wrote:

t should be checked especially if some naughty functions have played with it before

jhwurmbach wrote:

It should be. Always initialize your variables!

jhwurmbach wrote:

Do not let any naughty functions touch your private parts!

jhwurmbach wrote:

Do not program naughty functions in the first place.
If naughty functions are made by someone else and keep doing horrible things to the objects you gave them pointers to, hand them a copy of the object, and keep the original with yourself.

Electronic75 wrote:

my point is when it has been given a value somewhere in the program and there is a possibility that value dose not exist anymore so the value is wrong then still I need to check it.

Electronic75 wrote:

...it maybe necessary to check its validity.

HANDLE h = NULL;
// ...
// Now you are going to do something.
//
// Type 1: Result from some Windows APIs.
h = CreateFile(...);
if(INVALID_HANDLE_VALUE != h) {
  // ...
}
//
// Type 2: Check validity before doing Type 1.
if(!h) {
  h = CreateFile(...);
  if(INVALID_HANDLE_VALUE == h) {
    // Error.
  }
}
if(h) {
  CloseHandle(h);
  h = NULL; // Set null for your convenience later.
}

CloseHandle(handle);
handle = INVALID_HANDLE_VALUE;

Electronic75 wrote:

Still I'm sure most of you guys know about the function that checks validity of a pointer to be in valid memory space.

Electronic75 wrote:

Still I'm sure most of you guys know about the function that checks validity of a pointer to be in valid memory space.