MultiByteToWideChar() & NetShareCheck()

Hi there,

I would like to check some share info of remote machine's using the NetShareCheck function. It's all working fine as long as I declare a wmain function and call the NetShareCheck with the console parameters (argv[x]).

I would like to use this function within a normal main function and without using the console parameters. I've tried using the MultiByteToWideChar() function for conversion of normal char's to UNICODE. unfortunatly it doesn't work..

///////////////////////////////
LPCSTR szServer = "192.168.2.152";
LPWSTR lpWideCharStr;

MultiByteToWideChar(CP_ACP, 0, szServer, sizeof(szServer), lpWideCharStr, sizeof(lpWideCharStr));

res = NetShareCheck(lpWideCharStr, argv[2],&devType);
//////////////////////////////

any one suggestions or some sample code?

Thanks a lot!

There are several problems with the way you're calling MultiByteToWideChar().

1. You cannot use sizeof(szServer) to get the length of the string. Because of the way you've declared szServer -- as a pointer to a constant string literal -- sizeof() will return the size of the pointer itself, which presumably is 4 bytes. Your next thought might be to use strlen(szServer), but in my testing I found that the function seems to want the terminating null included in the character count, so you'd have to use strlen(szServer) + 1. An easier approach would be to use -1 for this parameter, which tells MultiByteToWideChar() that it should assume your string is null-terminated and figure out the length itself.

2. You have declared a pointer called lpWideCharStr without allocating any memory to it. Thus, trying to write to that pointer will almost certainly produce some kind of access violation. Declare an array of wchar_t instead.

3. If you declare an array of wchar_t, then sizeof(lpWideCharStr) will give the length of the buffer in bytes. But that's not what you want -- you need the length of the buffer in characters. So you need to divide sizeof(lpWideCharStr) by sizeof(wchar_t).

Here's an example program that shows a conversion such as the one you're attempting and checks to see whether it was successful.

Code:

---

#include <windows.h>

int main()
{   
    // original server address
    char szServer[] = "192.168.2.152";

    // this buffer holds the expected result so we can check whether the conversion works
    wchar_t wszNewServer1[] = L"192.168.2.152";

    // this buffer will hold the result of MultiByteToWideChar()
    wchar_t wszNewServer2[80];

    // convert szServer to wszNewServer2
    MultiByteToWideChar(CP_ACP, 0, szServer, -1, wszNewServer2, sizeof(wszNewServer2) / sizeof(wchar_t));
   
    // compare wszNewServer1 to wszNewServer2 to see if we got the expected results
    if (wcscmp(wszNewServer1, wszNewServer2) == 0)
        MessageBox(NULL, "Strings are equal!", "Results", MB_OK);
    else
        MessageBox(NULL, "Strings are not equal.", "Results", MB_OK);

    return 0;
}

---

Thanks a lot Smasher/Devourer!! Conversion seems to be working, but i'm still having problems calling the NetShareCheck function using these wide char formatted strings.

Any suggestion on that?

thanks in advance!

Quote:

---

Originally Posted by mocrotronics

Thanks a lot Smasher/Devourer!! Conversion seems to be working, but i'm still having problems calling the NetShareCheck function using these wide char formatted strings.

Any suggestion on that?

thanks in advance!

---

You mean this code?

Code:

---

res = NetShareCheck(lpWideCharStr, argv[2],&devType);

---

Well... Where do you define and/or fillup devType? Is argv[2] a wide character string or not? Notice argv[2] also has to be a wchar_t* and not char*. Use wmain to archeive this:

Code:

---

#define _UNICODE
#define UNICODE

int wmain ( int argc, wchar_t* argv[] )
{
  // use argv
}

---

Yes, if you're using main() rather than wmain(), then argv[2] must be converted to a Unicode string prior to passing it to NetShareCheck(). You can do the conversion on that string the same way you converted szServer to lpWideCharStr.

Code:

---

int main(int argc, TCHAR* argv[], TCHAR* envp[])
{
  NET_API_STATUS res;
  DWORD devType = 0;
 
 

    // this buffer holds the expected result so we can check whether the conversion works
    wchar_t wszNewServer1[] = L"192.168.2.152";
wchar_t wszDevice[] = L"C:";
       

  res = NetShareCheck(&wszNewServer1,&wszDevice,&devType);
}

---

I'm using the main function where i've now declared two wide chars. I've tried several methods to use these as functionparameters for NetShareCHeck. I can't get it working.

• Check this FAQ to see what's going wrong
• NetShareCheck on MSDN, with an example.

Quote:

---

Originally Posted by NoHero

• Check this FAQ to see what's going wrong
• NetShareCheck on MSDN, with an example.

---

I've had it working in the way it's described on the msdn (within a wmain function using argv[]). Instead, I would like to use this function within a main function with declared w_char vars (not using the main arguments) or converted conventional strings using the mentioned function MultiByteToWideChar.

The question is how to get this working.

Quote:

---

Originally Posted by mocrotronics

I've had it working in the way it's described on the msdn (within a wmain function using argv[]). Instead, I would like to use this function within a main function with declared w_char vars (not using the main arguments) or converted conventional strings using the mentioned function MultiByteToWideChar.

The question is how to get this working.

---

Then check the first FAQ to retrieve extended error information. Or use the \\ donation instead of IP address:

Code:

---

wchar_t szAddr[] = "\\\\.\\";

---

I don't think i'm passing the arguments in the right format within the main function. Even after the conversion to wide chars. Well, i think i just declare a wmain function, cause this seems to be working fine.

Thanks a lot guys!!

Quote:

---

Originally Posted by mocrotronics

I don't think i'm passing the arguments in the right format within the main function. Even after the conversion to wide chars. Well, i think i just declare a wmain function, cause this seems to be working fine.

Thanks a lot guys!!

---

Yes and define _UNICODE & UNICODE before including any headers. And start using tchar functionality. This helps you to quickly change between ANSI & Unicode.

:wave:

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