//header control example
#include <windows.h>
#include <commctrl.h>
#define ID_HEADER 100
#pragma comment(lib, "comctl32.lib")
HWND CreateHeader(HWND hwndParent);
LRESULT CALLBACK WndProc(HWND, UINT, WPARAM, LPARAM);
int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance,LPSTR lpCmdLine, int nCmdShow)
{
WNDCLASSEX wc;
MSG msg;

wc.cbSize = sizeof(WNDCLASSEX);
wc.style = 0;
wc.lpfnWndProc = WndProc;
wc.cbClsExtra = 0;
wc.cbWndExtra = 0;
wc.hInstance = hInstance;
wc.hIcon = LoadIcon(NULL, IDI_APPLICATION);
wc.hCursor = LoadCursor(NULL, IDC_ARROW);
wc.hbrBackground = (HBRUSH)(COLOR_WINDOW+1);
wc.lpszMenuName = NULL;
wc.lpszClassName = TEXT("myWindowClass");
wc.hIconSm = LoadIcon(NULL, IDI_APPLICATION);
RegisterClassEx(&wc);

CreateWindowEx(WS_EX_CLIENTEDGE,TEXT("myWindowClass"),TEXT("Header Control"), WS_VISIBLE | WS_OVERLAPPEDWINDOW,CW_USEDEFAULT, CW_USEDEFAULT, 400, 120, NULL, NULL, hInstance, NULL);

while(GetMessage(&msg, NULL, 0, 0) > 0)
{
TranslateMessage(&msg);
DispatchMessage(&msg);
}
return msg.wParam;
}

LRESULT CALLBACK WndProc(HWND hwnd, UINT msg, WPARAM wParam, LPARAM lParam)
{
static HWND headerCtl;
WINDOWPOS winpos;
switch(msg)
{
case WM_CREATE:
//load common control class ICC_LISTVIEW_CLASSES from the dynamic-link library (DLL)
INITCOMMONCONTROLSEX icex ;
icex.dwSize = sizeof(INITCOMMONCONTROLSEX) ;
icex.dwICC = ICC_LISTVIEW_CLASSES ;
InitCommonControlsEx(&icex) ;
headerCtl=CreateHeader(hwnd);
break;
//respond to windows size change.
case WM_SIZE:
RECT rect;
HDLAYOUT hdl;
HDITEM hdi;
GetClientRect(hwnd, &rect);
hdl.prc=&rect;
hdl.pwpos=&winpos;
Header_Layout(headerCtl,&hdl);//align first header
MoveWindow(headerCtl,winpos.x,winpos.y,winpos.cx,winpos.cy,1);
hdi.mask = HDI_TEXT | HDI_FORMAT | HDI_WIDTH;
hdi.pszText = TEXT("column 2");
hdi.cxy = rect.right;
hdi.cchTextMax = lstrlen(hdi.pszText);
hdi.fmt = HDF_LEFT | HDF_STRING;
SendMessage(headerCtl, HDM_SETITEM, (WPARAM)1, (LPARAM) &hdi);
Header_SetItem( headerCtl, 2,&hdi);//align second header
break;

case WM_NOTIFY:
//detects change in header control
{
NMHEADER * header_item = (NMHEADER *)lParam;
//respond to header click and display message boz
if ( header_item->hdr.code == HDN_ITEMCLICK )
{
switch ( header_item->iItem)
{
case 0:
MessageBox( NULL, TEXT("header 1"), TEXT("header 1 clicked"), MB_OK );
break;
case 1:
MessageBox( NULL, TEXT("header 2"), TEXT("header 2 clicked"), MB_OK );
break;

}

}
return 0;
}
break;
case WM_CLOSE:
DestroyWindow(hwnd);
break;
case WM_DESTROY:
PostQuitMessage(0);
break;
default:
return DefWindowProc(hwnd, msg, wParam, lParam);
}
return 0;
}


HWND CreateHeader(HWND hwndParent)
{
HWND hwndHeader;
RECT rcParent;
HDLAYOUT hdl;
WINDOWPOS wp;
if ((hwndHeader = CreateWindowEx(0, WC_HEADER, (LPCTSTR) NULL, WS_CHILD | WS_BORDER | HDS_BUTTONS | HDS_HORZ, 0, 0, 0, 0, hwndParent, (HMENU) ID_HEADER,NULL, (LPVOID) NULL)) == NULL)
return (HWND) NULL;
GetClientRect(hwndParent, &rcParent);
hdl.prc = &rcParent;
hdl.pwpos = &wp;
if (!SendMessage(hwndHeader, HDM_LAYOUT, 0, (LPARAM) &hdl))
return (HWND) NULL;
// Set the size, position, and appearance of the header control.
SetWindowPos(hwndHeader, wp.hwndInsertAfter, wp.x, wp.y,wp.cx, wp.cy, wp.flags | SWP_SHOWWINDOW);
HDITEM hdi;
hdi.mask = HDI_TEXT | HDI_FORMAT | HDI_WIDTH;
hdi.pszText = TEXT("column 1");
hdi.cxy = 150;
hdi.cchTextMax = lstrlen(hdi.pszText);
hdi.fmt = HDF_LEFT | HDF_STRING;
int index;
index = SendMessage(hwndHeader, HDM_INSERTITEM, (WPARAM) 1, (LPARAM) &hdi);
hdi.mask = HDI_TEXT | HDI_FORMAT | HDI_WIDTH;
hdi.pszText = TEXT("column 2");
hdi.cxy = rcParent.right-150;
hdi.cchTextMax = lstrlen(hdi.pszText);
hdi.fmt = HDF_LEFT | HDF_STRING;
index = SendMessage(hwndHeader, HDM_INSERTITEM, (WPARAM) 2, (LPARAM) &hdi);

return hwndHeader;
}