C / C++ / MFC

#define _WIN32_WINNT 0x0501
#include <windows.h>
#include "..\cximage600_full\CxImage\ximage.h"
#include ".\resource.h"

LRESULT CALLBACK WndProc (HWND, UINT, WPARAM, LPARAM) ;
HINSTANCE hGlobalInst = NULL;

int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE hPrevInstance,
                    PSTR szCmdLine, int iCmdShow)
{
	hGlobalInst = hInstance;
	HWND         hwnd ;
        MSG          msg ;
        WNDCLASSEX     wndclass ;
	 
	ZeroMemory(&wndclass,sizeof(WNDCLASSEX));

        wndclass.cbSize = sizeof(WNDCLASSEX);
	wndclass.style         = CS_HREDRAW | CS_VREDRAW ;
        wndclass.lpfnWndProc   = WndProc ;
        wndclass.cbClsExtra    = 0 ;
        wndclass.cbWndExtra    = 0 ;
        wndclass.hInstance     = hInstance ;
        wndclass.hIcon         = LoadIcon (NULL, IDI_APPLICATION) ;
        wndclass.hCursor       = LoadCursor (NULL, IDC_ARROW) ;
        wndclass.hbrBackground = (HBRUSH) GetStockObject (NULL_BRUSH) ;
	//wndclass.hbrBackground = (HBRUSH)   CreateSolidBrush(RGB(255,255,255));
        wndclass.lpszMenuName  = NULL ;
        wndclass.lpszClassName = "WndProc";
     
	 if (!RegisterClassEx (&wndclass))
        {
	      MessageBox (NULL, "Registration Fails","Error", MB_ICONERROR) ;
          return 0 ;
        }
     
     hwnd = CreateWindowEx(WS_EX_TOPMOST | WS_EX_TRANSPARENT | WS_EX_TOOLWINDOW | WS_EX_LAYERED,
"WndProc",  						
NULL,							WS_POPUP,						1,													   1,													   170,													   45,							
NULL,							
NULL,
hInstance,
NULL) ;							

	 if(!hwnd)
	 {
		 MessageBox (NULL, "Window Creation Fails","Error", MB_ICONERROR) ;
         return 0 ;
	 }
	 DWORD eRR1 = GetLastError();

     ShowWindow (hwnd, iCmdShow) ;
     //UpdateWindow(hwnd);
     //SetLayeredWindowAttributes(hwnd, RGB(255,255,255), 100, LWA_COLORKEY|LWA_ALPHA);

     while (GetMessage (&msg, NULL, 0, 0))
     {
          TranslateMessage (&msg) ;
          DispatchMessage (&msg) ;
     }

	 //DialogBox(hGlobalInst, MAKEINTRESOURCE(IDD_PNGBOX), NULL, (DLGPROC)WndProc);
     return msg.lParam;
}

LRESULT CALLBACK WndProc (HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
	PAINTSTRUCT    ps ;
	RECT		   rect;
	GetWindowRect(hWnd, &rect);
	switch (message)
    {
	case WM_PAINT:
	{
		// To draw PNG on window
		/*HDC hdc = BeginPaint (hWnd  , &ps) ;
				
		CxImage* image = new CxImage();
			 image->LoadResource(FindResource(NULL,MAKEINTRESOURCE(IDR_PNG1),"PNG"),CXIMAGE_FORMAT_PNG);
			BOOL iReturn = image->Draw(hdc, 1, 1);
			
		EndPaint (hWnd  , &ps) ;*/

		//To draw PNG on Desktop screen
		HDC hdc = GetDC(NULL);
		hdc = BeginPaint (NULL, &ps) ;
			
		CxImage* image = new CxImage();
		image->LoadResource(FindResource(NULL,MAKEINTRESOURCE(IDR_PNG1),"PNG"),CXIMAGE_FORMAT_PNG);
			BOOL iReturn = image->Draw(hdc, 1, 1);
			
		EndPaint (NULL , &ps) ;
		break;
	}
		
		default: return DefWindowProc(hWnd, message, wParam, lParam);
	}
	return 0;
}
</windows.h>

case WM_CTLCOLORDLG:
case WM_CTLCOLORSTATIC:
{
        HDC hdc = (HDC) wParam;
        HWND hwndStatic = (HWND) lParam;
	HBRUSH hbrBkcolor = (HBRUSH)GetStockObject(NULL_BRUSH);

	if (hwndStatic == GetDlgItem(hWnd, IDC_STATIC_CONTROL))
	{
		SetBkMode(hdc, TRANSPARENT);
		return (LRESULT) hbrBkcolor;
	}
        break;
}