SilverEngineEllipse

Non-MFC Applications

Applications for straight Win32 may also use the SilverEngine. The methodology is similar to that used by MFC programs. The task is to tie a Windows window to a SilverScreen screen. In the example that we provide, we create our window, and use sdc_open to make the connection. We also use the same window to be our “frame” window, using engine_set_frame_window.

Assume that we have the following global variables, used for a single-window application:

C / C++ Code

static HDC MemDC = NULL;

static HBITMAP MemBitmap = NULL;

static HBITMAP OldBitmap = NULL;

static SDCInitStruct SDCIS = {0};

static SDC SDCHandle = 0;

static HWND hwndMain = NULL;

In the section where we create the window, we can perform SilverEngine initialization:

C / C++ Code

hwndMain = CreateWindow( ClassName,

AppName,

WS_CAPTION | WS_SYSMENU | WS_MINIMIZEBOX | WS_THICKFRAME,

0, 0, 200, 200,

NULL, NULL, ghInst, NULL );

if ( ! hwndMain )

return FALSE;

// Show the window

ShowWindow(hwndMain, SW_SHOW);

UpdateWindow(hwndMain);

// Initialize SilverEngine and establish the frame window

eis.bits = EI_USE_ENV;

strcpy(eis.env_file, "silver");

engine_initialize(&eis);

engine_set_frame_window(hwndMain);

Again, a good place to handle SilverScreen Display Context creation is in the handler for WM_SIZE. This fragment would be for the first time that the window was sized, meaning that it’s when the SDC is created. If the SDC has already been created, then we would want to resize the bitmap associated with the refresh DC:

C / C++ Code

if ( ! SDCHandle )

{

MemDC = CreateCompatibleDC(hDC);

MemBitmap = CreateCompatibleBitmap(hDC, RectWidth(&wRect), RectHeight(&wRect));

OldBitmap = (HBITMAP)SelectObject(MemDC, MemBitmap);

SDCIS.hWnd = hwnd; // Can be NULL if not using interactive commands or OpenGL

SDCIS.drawDC = hDC; // Can be NULL if not using interactive commands

SDCIS.refreshDC = MemDC;

SDCHandle = sdc_open(&SDCIS);

sdc_goto(EngineWindow);

ss_command("silent screen create");

}

else

{

SelectObject(MemDC, OldBitmap);

DeleteObject(MemBitmap);

MemBitmap = CreateCompatibleBitmap(hDC, RectWidth(&wRect), RectHeight(&wRect));

OldBitmap = (HBITMAP)SelectObject(MemDC,MemBitmap);

}

// Inform SilverEngine the active display window has changed size

resize_screen(wRect.left, wRect.right - 1, wRect.top, wRect.bottom - 1, FALSE);

ss_command("refresh all");

ReleaseDC(hwnd, hDC);

Finally, the WM_PAINT handler refreshes the screen display from the refresh DC:

C / C++ Code

RECT wRect;

if ( SDCHandle )

{

GetClientRect(hWnd, &wRect);

BitBlt(hDC,

wRect.left,

wRect.top,

RectWidth(&wRect),

RectHeight(&wRect),

MemDC,

SRCCOPY);

}