Change Computer Name SetComputerNameEx()

dannyboy997 · 06-16-2009, 04:48 PM

I'm having a hard time finding a good way to change the name of a computer in C++, both NetBIOS and DNS.
I have found SetComputerNameEx(), but i can't see to get it to work, I am new to C++.

Here is what I have for far.

Code:

typedef enum _COMPUTER_NAME_FORMAT {
  ComputerNameNetBIOS,
  ComputerNameDnsHostname,
  ComputerNameDnsDomain,
  ComputerNameDnsFullyQualified,
  ComputerNamePhysicalNetBIOS,
  ComputerNamePhysicalDnsHostname,
  ComputerNamePhysicalDnsDomain,
  ComputerNamePhysicalDnsFullyQualified,
  ComputerNameMax
} COMPUTER_NAME_FORMAT;


bool WINAPI SetComputerNameEx(COMPUTER_NAME_FORMAT NameType, LPCTSTR lpBuffer);

SetComputerNameEx(ComputerNamePhysicalDnsHostname,"testname");

This is the error I am currently getting which makes no sense to me.
main.cpp||undefined reference to`_Z17SetComputerNameEx21_COMPUTER_NAME_FORMATPKc @8'|

I don't have to use SetComputerNameEx() but it's all I've found so far. Any help and suggestions would be greatly appreciated.

Thanks in advance

matsp · 06-16-2009, 04:54 PM

You need to tell the compiler that SetComputerNameEx is a "C" function, so stick

Code:

extern "C"

in front of the declaration.

--
Mats

dannyboy997 · 06-16-2009, 09:53 PM

As you can tell I'm new to this and this is probably a stupid question

Here's what I have

Code:

typedef enum _COMPUTER_NAME_FORMAT {
  ComputerNameNetBIOS,
  ComputerNameDnsHostname,
  ComputerNameDnsDomain,
  ComputerNameDnsFullyQualified,
  ComputerNamePhysicalNetBIOS,
  ComputerNamePhysicalDnsHostname,
  ComputerNamePhysicalDnsDomain,
  ComputerNamePhysicalDnsFullyQualified,
  ComputerNameMax
} COMPUTER_NAME_FORMAT;

extern "C" bool WINAPI SetComputerNameEx(COMPUTER_NAME_FORMAT NameType, LPCTSTR lpBuffer);

SetComputerNameEx(ComputerNamePhysicalDnsHostname,"testname");

But I'm not getting this error
main.cpp|69|undefined reference to `SetComputerNameEx@8'|

Thanks for your help so far matsp

tabstop · 06-17-2009, 07:08 AM

Are you linking kernel32.dll (or kernel32.lib) into your project?

dannyboy997 · 06-17-2009, 09:19 AM

I haven't added any source code to link to kernel32.dll or kernel32.lib which would probably be the problem, but I don't know how. I did add kernel32.lib to the library linker, but no change.
I'm using Code::Block if it makes a difference.

tabstop · 06-17-2009, 10:48 AM

One possibility: The default value of _WIN32_WINNT, at least on my system in Code::Blocks, is 0x0400; this function requires 0x0500 or larger. You should #define the correct value of _WIN32_WINNT before you include windows.h, and you can look up "correct value" at MSDN. (Because the one thing you shouldn't be doing is typing those declarations at the top of your file.)

tabstop · 06-17-2009, 10:54 AM

Update: It appears that C::B and VS don't use the same windows.h header (there's a windows.h in my C:\MinGW\include directory, and there's one ... somewhere .... in my VS path). The code you have works just fine in VS, but not in C::B, and I'm guessing that may be the issue. I don't know how or where to get a newer windows.h, but perhaps that's something you can search for.

dannyboy997 · 06-18-2009, 04:56 PM

I found both Windows.h(VS) and windows.h(C::B). I tried to copy the VS Windows.h but there where a ton of headers that the Windows.h(VS) had that the C::B windows.h doesn't use = lots of errors. I'll try compiling in VS later and see if it work.

Does anyone know a different way of changing the computers name.
Thanks for you help.

06-16-2009, 04:48 PM	#1
dannyboy997 Registered User Join Date: Jun 2009 Posts: 4	Change Computer Name SetComputerNameEx() I'm having a hard time finding a good way to change the name of a computer in C++, both NetBIOS and DNS. I have found SetComputerNameEx(), but i can't see to get it to work, I am new to C++. Here is what I have for far. Code: typedef enum _COMPUTER_NAME_FORMAT { ComputerNameNetBIOS, ComputerNameDnsHostname, ComputerNameDnsDomain, ComputerNameDnsFullyQualified, ComputerNamePhysicalNetBIOS, ComputerNamePhysicalDnsHostname, ComputerNamePhysicalDnsDomain, ComputerNamePhysicalDnsFullyQualified, ComputerNameMax } COMPUTER_NAME_FORMAT; bool WINAPI SetComputerNameEx(COMPUTER_NAME_FORMAT NameType, LPCTSTR lpBuffer); SetComputerNameEx(ComputerNamePhysicalDnsHostname,"testname"); This is the error I am currently getting which makes no sense to me. main.cpp\|\|undefined reference to`_Z17SetComputerNameEx21_COMPUTER_NAME_FORMATPKc @8'\| I don't have to use SetComputerNameEx() but it's all I've found so far. Any help and suggestions would be greatly appreciated. Thanks in advance
dannyboy997 is offline

06-16-2009, 04:54 PM	#2
matsp Kernel hacker Join Date: Jul 2007 Location: Farncombe, Surrey, England Posts: 15,686	You need to tell the compiler that SetComputerNameEx is a "C" function, so stick Code: extern "C" in front of the declaration. -- Mats __________________ Compilers can produce warnings - make the compiler programmers happy: Use them! Please don't PM me for help - and no, I don't do help over instant messengers.
matsp is offline

06-17-2009, 07:08 AM	#4
tabstop and the Hat of Guessing Join Date: Nov 2007 Posts: 8,740	Are you linking kernel32.dll (or kernel32.lib) into your project?
tabstop is offline

06-17-2009, 09:19 AM	#5
dannyboy997 Registered User Join Date: Jun 2009 Posts: 4	I haven't added any source code to link to kernel32.dll or kernel32.lib which would probably be the problem, but I don't know how. I did add kernel32.lib to the library linker, but no change. I'm using Code::Block if it makes a difference.
dannyboy997 is offline

06-17-2009, 10:48 AM	#6
tabstop and the Hat of Guessing Join Date: Nov 2007 Posts: 8,740	One possibility: The default value of _WIN32_WINNT, at least on my system in Code::Blocks, is 0x0400; this function requires 0x0500 or larger. You should #define the correct value of _WIN32_WINNT before you include windows.h, and you can look up "correct value" at MSDN. (Because the one thing you shouldn't be doing is typing those declarations at the top of your file.)
tabstop is offline

06-17-2009, 10:54 AM	#7
tabstop and the Hat of Guessing Join Date: Nov 2007 Posts: 8,740	Update: It appears that C::B and VS don't use the same windows.h header (there's a windows.h in my C:\MinGW\include directory, and there's one ... somewhere .... in my VS path). The code you have works just fine in VS, but not in C::B, and I'm guessing that may be the issue. I don't know how or where to get a newer windows.h, but perhaps that's something you can search for.
tabstop is offline

06-18-2009, 04:56 PM	#8
dannyboy997 Registered User Join Date: Jun 2009 Posts: 4	I found both Windows.h(VS) and windows.h(C::B). I tried to copy the VS Windows.h but there where a ton of headers that the Windows.h(VS) had that the C::B windows.h doesn't use = lots of errors. I'll try compiling in VS later and see if it work. Does anyone know a different way of changing the computers name. Thanks for you help.
dannyboy997 is offline

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