The following code is taken from here. I removed all Windows NT part as I am working on Windows 7.

I copied this code and run in visual studio 2010 (New project-> VC++->CLR->CLR Console... ). But it is giving lots of unresolved extern 'c' errors as listed below the code. What wrong I have committed? 

#define STRICT  1 

#include <windows.h>
#include <iostream>
using namespace std;

BOOL CALLBACK EnumWindowsProc(HWND hWnd, LPARAM lParam) {
DWORD dwThreadId, dwProcessId;
HINSTANCE hInstance;
char String[255];
HANDLE hProcess;
if (!hWnd)
return TRUE;        // Not a window
if (!::IsWindowVisible(hWnd))
return TRUE;        // Not visible
if (!SendMessage(hWnd, WM_GETTEXT, sizeof(String), (LPARAM)String))
return TRUE;        // No window title
hInstance = (HINSTANCE)GetWindowLong(hWnd, GWL_HINSTANCE);
dwThreadId = GetWindowThreadProcessId(hWnd, &dwProcessId);
hProcess = OpenProcess(PROCESS_ALL_ACCESS, FALSE, dwProcessId);
cout << hWnd << ' ' << dwProcessId << '\t' << String << '\t';
cout << "(None)\n";
CloseHandle(hProcess);
return TRUE;
}

int main(int argc, char *argv[], char *envp[]) {
EnumWindows(EnumWindowsProc, NULL);
return 0;
}

This is giving following Errors(and other similar unresolved extern C errors) 

 1>wndowfind.obj : error LNK2028: unresolved token (0A000342) "extern "C" int __stdcall       
 EnumWindows(int (__stdcall*)(struct HWND__ *,long),long)"     3
 (?EnumWindows@@$$J18YGHP6GHPAUHWND__@@J@ZJ@Z) referenced in function "int __cdecl 
 main(int,char * * const,char * * const)" (?main@@$$HYAHHQAPAD0@Z)

 1>wndowfind.obj : error LNK2028: unresolved token (0A000346) "extern "C" unsigned long  
 __stdcall GetWindowThreadProcessId(struct HWND__ *,unsigned long *)"    
 (?GetWindowThreadProcessId@@$$J18YGKPAUHWND__@@PAK@Z) referenced in
windows winforms visual-studio-2010
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