How to Lenght() and Mid() function ???

[daniloa]

Hy, I'm a VB developer and now I'm using MS Visual C++ 6 to develop some codes to telephony. And I have a litle problem:

MSVC++ have some function like Len() and Mid() and InSTR() Vb functions ????

how can I know how many characters have a char variable ???

Very thanks,

Danilo Almeida ...

 

[Skatanic]

If you have a c-string (a char*, or char[]), then you can use strlen(char*) to get the length of the string. It is defined in the header <string.h> or the standard header <cstring> (use std::strlen(char*) ). For mid, just divide what strlen returns by 2 and that will give you the index to the middle point in the array of characters.

-Skatanic

 

[wduty]

If you have a char array let's say szChar:

[red]Len()[/red]

int len = strlen(szChar);

[red]Mid()[/red](to get a substring of length L starting from point P.)
If you know the length of the substring at compile time:

char szSubstring[11];           // SET UP BUFFER
char* p = szChar + P;           // SET POINTER TO POSITION
strncpy(szSubstring, p, 10);     // COPY
szSubstring[10] = 0;             // SET TERMINATOR

otherwise it will have to be allocated:

char* szSubstring = new char[length + 1];           
char* p = szChar + P;         
strncpy(szSubstring, p, length);     
szSubstring[length] = 0;
...
delete szSubstring; // AT SOME POINT...

[red]InStr()[/red](to search a string for another string)

strstr(szChar, "searchfor");

of course you can use std::string which has built in methods for all this stuff.

 

[fheyn]

if you user CString - Variables, which I recommand,
you can use MyVar.GetLength(), MyVar.Left(..), etc.
And it's much easier to build new strings using CString-Variables.