SetClipboardData() not working

[warrier]

i have a problem
i tried using setclipboarddata() here is the code:

#include <string>
#include <iostream>
#include <Windows.h>
#using <System.DLL>
#using <System.Windows.Forms.DLL>
using namespace std;
using namespace System;
using namespace System::Windows::Forms;




int copystr(const char* clipoutput)
	{
		const size_t len = strlen(clipoutput) + 1;

		HGLOBAL hMem = GlobalAlloc(GMEM_MOVEABLE, len);
		memcpy(GlobalLock(hMem), clipoutput, len);
		GlobalUnlock(hMem);
		OpenClipboard(0);
		EmptyClipboard();
		SetClipboardData(CF_TEXT, hMem);
		MessageBox::Show("String has been copied to clipboard!", "Copied", MessageBoxButtons::OK, MessageBoxIcon::Information);
		CloseClipboard();
		return 0;
	}

and then i called it here:

private: System::Void Decrypt(System::Object^  sender, System::EventArgs^  e) {
				extern string ES;
				ES.reserve(1000);
				System::String^ ESd;
				decrypt(ES, p, ESd);
				System::Windows::Forms::DialogResult copy;
				copy = MessageBox::Show(ESd + ". Copy? \n", "Encrypted String", MessageBoxButtons::YesNo, MessageBoxIcon::Information);
				if (copy == System::Windows::Forms::DialogResult::Yes)
				{
					MessageBox::Show("String copied to clipboard!", "Sorry", MessageBoxButtons::OK, MessageBoxIcon::Information);
					copystr(ES.c_str());
				}
		 }

and i get the following errors:



1

>CrypterGUI.obj : error LNK2028: unresolved token (0A00006C) "extern "C" int __stdcall CloseClipboard(void)" (?CloseClipboard@@$$J10YGHXZ) referenced in function "extern "C" int __clrcall copystr(char const *)" (?copystr@@$$J0YMHPBD@Z)
1>CrypterGUI.obj : error LNK2028: unresolved token (0A00006E) "extern "C" void * __stdcall SetClipboardData(unsigned int,void *)" (?SetClipboardData@@$$J18YGPAXIPAX@Z) referenced in function "extern "C" int __clrcall copystr(char const *)" (?copystr@@$$J0YMHPBD@Z)
1>CrypterGUI.obj : error LNK2028: unresolved token (0A00006F) "extern "C" int __stdcall EmptyClipboard(void)" (?EmptyClipboard@@$$J10YGHXZ) referenced in function "extern "C" int __clrcall copystr(char const *)" (?copystr@@$$J0YMHPBD@Z)
1>CrypterGUI.obj : error LNK2028: unresolved token (0A000070) "extern "C" int __stdcall OpenClipboard(struct HWND__ *)" (?OpenClipboard@@$$J14YGHPAUHWND__@@@Z) referenced in function "extern "C" int __clrcall copystr(char const *)" (?copystr@@$$J0YMHPBD@Z)
1>CrypterGUI.obj : error LNK2019: unresolved external symbol "extern "C" int __stdcall CloseClipboard(void)" (?CloseClipboard@@$$J10YGHXZ) referenced in function "extern "C" int __clrcall copystr(char const *)" (?copystr@@$$J0YMHPBD@Z)
1>CrypterGUI.obj : error LNK2019: unresolved external symbol "extern "C" void * __stdcall SetClipboardData(unsigned int,void *)" (?SetClipboardData@@$$J18YGPAXIPAX@Z) referenced in function "extern "C" int __clrcall copystr(char const *)" (?copystr@@$$J0YMHPBD@Z)
1>CrypterGUI.obj : error LNK2019: unresolved external symbol "extern "C" int __stdcall EmptyClipboard(void)" (?EmptyClipboard@@$$J10YGHXZ) referenced in function "extern "C" int __clrcall copystr(char const *)" (?copystr@@$$J0YMHPBD@Z)
1>CrypterGUI.obj : error LNK2019: unresolved external symbol "extern "C" int __stdcall OpenClipboard(struct HWND__ *)" (?OpenClipboard@@$$J14YGHPAUHWND__@@@Z) referenced in function "extern "C" int __clrcall copystr(char const *)" (?copystr@@$$J0YMHPBD@Z)
1>C:\C++\Projects\Debug\CrypterGUI.exe : fatal error LNK1120: 8 unresolved externals

can someone please tell me what i did wrong?
thanks in advance!

[kbw]

You need to link with user32.lib

[warrier]

how do i do that? sorry im fairly new to c++

[kbw]

You need to set it up in the link section of your environment. How are you compiling your code?

[warrier]

im using vc 2010 express

[kbw]

1. Select your project in Project Explorer.
2. Press the Properties button at the top of the control.
3. Select Configuration Properties->Linker->Input
4. Change Configuration to All Configurations
5. Add user32.lib to Additional Dependencies.

[modoran]

sorry im fairly new to c++

You don't seem to know that your posted code is NOT written in C++ language.

[warrier]

thanks a lot kbw it works now and is modoran correct about this not being c++?

[warrier]

actually no i know this is c++. first of all as far as i know, c does not use ::. and second of all, when i say fairly new, i dont mean im completely inept in c++.

[kbw]

It's C++/CLI, which is C++ for the .Net environment. It's tweaked in places for that environment.