CString to char* :(
Author
more data conversion problems :(
I have a url inputted through an edit box.
I parse this url into hostname, filepath and filename
now for the following line I need the hostname as a const char *
if (inet_addr(HostName) == INADDR_NONE)
I have googled and tried the GetBuffer method, but to no avail.
Also can someone point me to a good unicode explanation tutorial.
CString.operator LPCSTR() if you need a char* to use. It should work for what you are doing.
For a good unicode tutorial, take a look at this
For a good unicode tutorial, take a look at this
Author
thanks for the quick reply.
can you give me some example code, as im not entirely sure how to use that.
can you give me some example code, as im not entirely sure how to use that.
Sure!
I'm pretty sure that should work for you, you can also const char* cast it if you wanted to as well.
CString HostName = "hostname";if (inet_addr( HostName.operator LPCSTR() ) == INADDR_NONE)I'm pretty sure that should work for you, you can also const char* cast it if you wanted to as well.
CString HostName = "hostname";if (inet_addr( (const char*)(HostName.operator LPCSTR()) ) == INADDR_NONE)Quote:Original post by Drew_Benton
Sure!
CString HostName = "hostname";
if (inet_addr( HostName.operator LPCSTR() ) == INADDR_NONE)
No need for the convoluted syntax. This should work just fine:
CString HostName = "hostname";
if (inet_addr( (LPCSTR)HostName ) == INADDR_NONE)
In general, an operator foo for a class, where foo is an existing typename rather than some symbol describing an operator, is a "cast operator", used to perform casts to foo when they are requested. LPCSTR is simply a typedef for a char* ("long pointer to C-style string"); thus its presence in the CString definition means we can obtain a const char* by simply casting to that type, as the AP illustrates. (You could also be more explicit by writing static_cast<const char*>(HostName).)
Note that CStrings are nearly as ugly as working with char*'s directly, and you really should prefer std::string for any textual data in C++ (to the extent that it's possible - here you're working with someone else's library, so you'll have to bite the bullet). Note also that std::string does *not* provide this cast operator (but instead a member function .c_str() which performs the task), and the people who designed the library have very good reasons for having done it this way (unfortunately I can't recall at the moment what they are).
Note that CStrings are nearly as ugly as working with char*'s directly, and you really should prefer std::string for any textual data in C++ (to the extent that it's possible - here you're working with someone else's library, so you'll have to bite the bullet). Note also that std::string does *not* provide this cast operator (but instead a member function .c_str() which performs the task), and the people who designed the library have very good reasons for having done it this way (unfortunately I can't recall at the moment what they are).
Author
ok, the
Hostname.Operatoer LPCSTR()
gives an error: "const char *: is ambiguouse ..."
the
(LPCSTR)hostname
gives the error: " can nt convert cstring to LPCSTR"
and as I said in my first post getbuffer doesn't work either I get
"can not coonvert paramater 1 from wchar _t* to const char*
Hostname.Operatoer LPCSTR()
gives an error: "const char *: is ambiguouse ..."
the
(LPCSTR)hostname
gives the error: " can nt convert cstring to LPCSTR"
and as I said in my first post getbuffer doesn't work either I get
"can not coonvert paramater 1 from wchar _t* to const char*
The operator in CString is named LPCTSTR. LPCSTR and LPCTSTR both (should) point to a constant null-terminated string, but LPCTSTR indicates Unicode/DBCS compatibility (if UNICODE is defined), while LPCSTR does not.
See MSDN for more details.
See MSDN for more details.
Author
neither work :(
there must be a way to do this.
A CEdit box returns a CString, and the inet_addr needs a char *
Is there any other function to replace either of these, to either start with a char[] or use a cstring?
there must be a way to do this.
A CEdit box returns a CString, and the inet_addr needs a char *
Is there any other function to replace either of these, to either start with a char[] or use a cstring?
This topic is closed to new replies.
Advertisement
Popular Topics
Advertisement
