passing vector by reference

[superPuru]

I have a winapi where I try to pass a reference of a vector (but it is not as simple vector as in the tutorials or examples) to function but can not get it together...

I have a Gui. If a certain button is clicked it will initiate EnumProc. I would like to pass a reference of an empty vector in the additional LPARAM of EnumProc. If windows of my criteria are found under the EnumProc i would put the handle, name of the window and some other stuff in the vector. They would then be accessible when the EnumProc has ended...

Currently when Compiling i'm getting:
expected primary-expression before "arMyClass"
at the line where EnumProc is being called (2nd bolded line)

I tried to bold the parts that I think/know are causing this. Any help appreciated.

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class CMyClass
{
public:
  CMyClass() {}
  CMyClass(int def_x, int def_y, string def_nimi, HWND def_handu) : x(def_x), y(def_y), nimi(def_nimi), handu(def_handu) {}
  virtual ~CMyClass() {}
  int x, y;
  string nimi;
  HWND handu;
};

BOOL CALLBACK EnumProc(HWND thwnd,vector<CMyClass*> &v);
HINSTANCE hInstance;

LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ;

int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance, PSTR szCmdLine, int iCmdShow)
{
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}

LRESULT CALLBACK WndProc (HWND hwnd, UINT iMsg, WPARAM wParam, LPARAM lParam) 
{
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case WM_COMMAND : 
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 case BN_CLICKED:
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if ( LOWORD (wParam) == 6 ) {
vector<CMyClass*> arMyClass;

//testing if it works, adding some stuff
arMyClass.push_back(new CMyClass(2, 40, "kasdsdlle", NULL));
arMyClass.push_back(new CMyClass(4, 60, "visdsadlle", NULL));

EnumWindows((WNDENUMPROC) EnumProc,vector<CMyClass*> arMyClass);
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}

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}

BOOL CALLBACK EnumProc(HWND thwnd,vector<CMyClass*> l)
{
//THESE LINES JUST FOR TESTING
//testing if I can access the vector here
vector<CMyClass*>::iterator itPos = l.begin();
for(; itPos < l.end(); itPos++) {
      string teksti = (*itPos)->nimi;
      char *p;
      p=&teksti[0];
      MessageBox(NULL, p, "otsikko", MB_OK);
}
//End of test lines

char buff[MAX_PATH+1];
GetWindowText(thwnd,buff,MAX_PATH+1);
if(strstr(buff, myCriteria)) {
//adding to the vector
l.push_back(new CMyClass(2, 40, "third", NULL));
}

return TRUE;
}