Create Window

//.H

#pragma once
#include <Windows.h>

LRESULT CALLBACK CaliperProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam); //window procedure
class CCaliperPage
{
public:
//friend elements:
friend LRESULT CALLBACK CaliperProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam);

CCaliperPage(HWND parentWnd, RECT rc);
~CCaliperPage();

HWND GetParentWnd();
HWND GetWnd();

private:
HWND m_hWndParent;
HWND m_hWnd;

void PaintPage(CDC * a_pDC);
void LeftBtnDown(CPoint point);
void LeftBtnUp(CPoint point);

};

 

#include "stdafx.h"
#include "CaliperPage.h"

static CCaliperPage* g_CaliperPage = NULL;

LRESULT CALLBACK CaliperProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{

switch (message)
{
case WM_PAINT:
{
PAINTSTRUCT ps;
HDC hdc;
hdc = BeginPaint(hWnd, &ps);
CDC * pDC = new CDC;
pDC->Attach(hdc);
g_CaliperPage->PaintPage(pDC);
pDC->DeleteDC();
delete pDC;
EndPaint(hWnd, &ps);
}
break;
case WM_LBUTTONDOWN:
{
int xPos = GET_X_LPARAM(lParam);
int yPos = GET_Y_LPARAM(lParam);
g_CaliperPage->LeftBtnDown(CPoint(xPos,yPos));
}
break;
case WM_LBUTTONUP:
{
int xPos = GET_X_LPARAM(lParam);
int yPos = GET_Y_LPARAM(lParam);
g_CaliperPage->LeftBtnUp(CPoint(xPos, yPos));
}
break;
default:
return DefWindowProc(hWnd, message, wParam, lParam);
break;
}
return TRUE; //if not return true createwindow fail

}

CCaliperPage::CCaliperPage(HWND parentWnd, RECT rc)
{
m_hWndParent = parentWnd;

//register window class
WNDCLASSEX wcex;
wcex.cbSize = sizeof(WNDCLASSEX);
wcex.style = CS_HREDRAW | CS_VREDRAW;
wcex.lpfnWndProc = CaliperProc;
wcex.cbClsExtra = 0;
wcex.cbWndExtra = 0;
wcex.hInstance = NULL;
wcex.hIcon = NULL;
wcex.hCursor = LoadCursor(NULL,IDC_ARROW);
wcex.hbrBackground = (HBRUSH)GetStockObject(HOLLOW_BRUSH);
wcex.lpszMenuName = NULL;
wcex.lpszClassName = _T("CaliperWindowClass");
wcex.hIconSm = NULL;
RegisterClassEx(&wcex);

//create window:
m_hWnd = CreateWindowEx(WS_EX_TRANSPARENT, _T("CaliperWindowClass"), NULL, (WS_POPUP | WS_VISIBLE), rc.left, rc.top, rc.right - rc.left, rc.bottom - rc.top,
m_hWndParent,NULL,NULL,NULL);
if (NULL == m_hWnd)
{
DWORD errID = GetLastError();
m_hWndParent = NULL;
}
RegisterTouchWindow(m_hWnd, TWF_WANTPALM);   //D "WINVER=0x0601" 

g_CaliperPage = this;
}
CCaliperPage::~CCaliperPage()
{

if (NULL != m_hWnd)
{
//UnregisterTouchWindow(m_hWnd);
DestroyWindow(m_hWnd);
g_CaliperPage = NULL;
}

}

HWND CCaliperPage::GetParentWnd()
{
return m_hWndParent;
}
HWND CCaliperPage::GetWnd()
{
return m_hWnd;
}

///////////////////////////////////////////

//不占用焦点
SetWindowLong(m_hWnd, GWL_EXSTYLE, 0x08000000L | GetWindowLong(m_hWnd, GWL_EXSTYLE));

SetWindowPos(m_hWnd, HWND_TOPMOST, 0, 0, 0, 0, SWP_NOMOVE | SWP_NOSIZE);