Getting HDD serial No in C++/CLI environment

J_E_D_I

Hi, I had this code which worked beautifully in console mode, but now I am trying to convert the program into windows forms and the compiler returns the following error: Error 1 error C3861: '_T': identifier not found Any advice on how to solve this problem would be highly appreciated.

int GetHDDserialNo;

//// Gets HDD serial No
TCHAR volumeName\[MAX\_PATH\];
DWORD volumeSerialNumber;
DWORD maxNameLength;
DWORD fileSystemFlags;
TCHAR systemName\[MAX\_PATH\];

GetHDDserialNo = GetVolumeInformation
	(
	\_T("c:\\\\"),
	volumeName, MAX\_PATH,
	&volumeSerialNumber,
	&maxNameLength,
	&fileSystemFlags,
	systemName, MAX\_PATH
	);

int SerialNumber = volumeSerialNumber;

Mark Salsbery

J_E_D_I wrote:

'_T': identifier not found

#include <tchar.h>

Mark Salsbery Microsoft MVP - Visual C++ :java:

J_E_D_I

Thanks, I do not get that error anymore...but I get all those ones! Error 1 error C2065: 'MAX_PATH' : undeclared identifier Error 2 error C2065: 'DWORD' : undeclared identifier Error 3 error C2146: syntax error : missing ';' before identifier 'volumeSerialNumber' Error 4 error C2065: 'DWORD' : undeclared identifier Error 5 error C2146: syntax error : missing ';' before identifier 'maxNameLength' Error 6 error C2065: 'maxNameLength' : undeclared identifier Error 7 error C2065: 'DWORD' : undeclared identifier Error 8 error C2146: syntax error : missing ';' before identifier 'fileSystemFlags' Error 9 error C2065: 'fileSystemFlags' : undeclared identifier Error 10 error C2065: 'MAX_PATH' : undeclared identifier Error 11 error C2065: 'maxNameLength' : undeclared identifier Error 12 error C2065: 'fileSystemFlags' : undeclared identifier Error 13 error C2065: 'systemName' : undeclared identifier Error 14 error C2065: 'MAX_PATH' : undeclared identifier Error 15 error C2078: too many initializers

Mark Salsbery

What other header files are you including? Those errors indicate windows.h is not included.

Mark Salsbery Microsoft MVP - Visual C++ :java:

J_E_D_I

Actually, windows.h is already included in the .cpp file... These are the other header files I've got:

#include "stdafx.h"
#include "Form1.h"
#include tchar.h
#include vector
#include ctime
#include math.h
#include fstream
#include string
#include iostream
#include sstream
using std::dec;
using std::hex;
#include iomanip
using std::setprecision;
using std::setbase;
#include cstdlib
using std::atof;
#include windows.h
#pragma comment(lib, "user32.lib")
#include stdio.h
#include cstdio
#include strsafe.h
using namespace Ex22_01;

(Note: I had to remove < and > from the directives as otherwise it would not show up in this message)

Luc Pattyn

Hi, it may come as a surprise, but the order of the includes matters too. i.e. if tchar.h relies on windows.h, then windows.h must precede tchar.h; normally if you suddenly need another include, you put it at the end of the list. BTW: the behavior of message editing regarding < and > depends on the checked state of "Ignore HTML tags in this message" checkbox. :)

Luc Pattyn [Forum Guidelines] [My Articles]

Fixturized forever. :confused:

Mark Salsbery

As Luc mentioned, the order of the #includes can be a factor. Another recent post asked about tchar.h and I tested it - it can be used all by itself and it pulls in any additional header files it needs, so I wouldn't think that's an issue here.. In your stdafx.h file, you may be missing the Windows versioning macros. The macros have changed a bit in recent SDK versions, but if you create a dummy project (MFC or Win32) you can look at the stdafx.h file and see the defaults. For example, here's a stdafx.h file from one of my projects, using the latest SDK on VS 2008:

// stdafx.h : include file for standard system include files,
// or project specific include files that are used frequently,
// but are changed infrequently

#pragma once

#define WIN32_LEAN_AND_MEAN

#include "targetver.h"

#include <stdio.h>
#include <tchar.h>

#ifndef VC_EXTRALEAN
#define VC_EXTRALEAN
#endif

// Windows Header Files:
#include <windows.h>

// targetver.h

#pragma once

#ifndef NTDDI_VERSION
#define NTDDI_VERSION NTDDI_WINXPSP2
#endif

#ifndef WINVER
#define WINVER _WIN32_WINNT_WINXP
#endif

#ifndef _WIN32_WINNT
#define _WIN32_WINNT _WIN32_WINNT_WINXP
#endif

#ifndef _WIN32_WINDOWS
#define _WIN32_WINDOWS 0x0410
#endif

#ifndef _WIN32_IE
#define _WIN32_IE 0x0600
#endif

Mark Salsbery Microsoft MVP - Visual C++ :java:

J_E_D_I

Luc, you are absolutely right! I've changed the order of the include directives and it works like a breeze. Thank you so much for this, I admit I would have never thought about it. :)

J_E_D_I

Hi Mark, thanks for this detailed suggestion. Luc's advice however solved the problem easily and for the time being I'll stick with it. I'll definitely look into your solution if a similar problem happens in the future. Cheers :-D

Luc Pattyn

You're welcome. :)

Luc Pattyn [Forum Guidelines] [My Articles]

Fixturized forever. :confused:

J_E_D_I

Hi again Luc, I was wondering if you had any hint on how to solve this problem which is somehow linked to the previous one. I need to save the value obtained with the previous code (which is a DWORD: DesiredValue) in a registry key and this was the syntax I was using (successfully) in console environment.

DWORD DesiredValue;

// Creates Desired Registry Key
HKEY Xtmpkey;
DWORD dwDisp = 0;
LPDWORD xlpdwDisposition = &dwDisp;
DWORD dwVal = DesiredValue;
// Desired Path for the Registry Key
RegCreateKeyEx(HKEY_CURRENT_USER, L"SOFTWARE\\MyPath", 0L,NULL, REG_OPTION_NON_VOLATILE, KEY_ALL_ACCESS, NULL, &Xtmpkey,xlpdwDisposition);

// Creates Desired Value
RegSetValueEx (Xtmpkey, L"Desired_Value_Name", 0L, REG_DWORD,(CONST BYTE*) &dwVal, sizeof(DWORD));

Now that I am porting the software into C++/CLI environment it returns the following errors: Error 1 error LNK2001: unresolved external symbol "extern "C" long __stdcall RegCreateKeyExW(struct HKEY__ *,wchar_t const *,unsigned long,wchar_t *,unsigned long,unsigned long,struct _SECURITY_ATTRIBUTES * const,struct HKEY__ * *,unsigned long *)" (?RegCreateKeyExW@@$$J236YGJPAUHKEY__@@PB_WKPA_WKKQAU_SECURITY_ATTRIBUTES@@PAPAU1@PAK@Z) Error 2 error LNK2001: unresolved external symbol "extern "C" long __stdcall RegSetValueExW(struct HKEY__ *,wchar_t const *,unsigned long,unsigned long,unsigned char const *,unsigned long)" (?RegSetValueExW@@$$J224YGJPAUHKEY__@@PB_WKKPBEK@Z) Error 3 fatal error LNK1120: 2 unresolved externals What am I doing wrong? I thank you in advance.

Luc Pattyn

Hi, there are two ways to solve this: 1. most registry operations are supported in .NET by the Registry class things not supported include special key types (not REG_SZ) 2. when the Registry class does not offer what you need, you have to call the native functions (such as RegCreateKeyEx). I don't know the details for C++, but you somehow must tell it where the library functions can be found, and how they should be called. This article[^] probably contains all you need and more. FYI: in C# there is only one way to access native code, that is thru P/Invoke. Remark: you would better have started a new thread for a question that hardly is connected to an old topic... that would have improved your chances for someone else to pick it up. :)

Luc Pattyn [Forum Guidelines] [My Articles]

Fixturized forever. :confused:

adi0990

Use #include "atlstr.h" or #include "afx.h" header file.