自学教程：C++ DeleteObject函数代码示例

    void NativeTextfieldWin::OnNCPaint(HRGN region)    {        if(!textfield_->draw_border())        {            return;        }        HDC hdc = GetWindowDC();        RECT window_rect;        GetWindowRect(&window_rect);        // Convert to be relative to 0x0.        ::OffsetRect(&window_rect, -window_rect.left, -window_rect.top);        ExcludeClipRect(hdc,            window_rect.left+content_insets_.left(),            window_rect.top+content_insets_.top(),            window_rect.right-content_insets_.right(),            window_rect.bottom-content_insets_.bottom());        HBRUSH brush = CreateSolidBrush(bg_color_);        FillRect(hdc, &window_rect, brush);        DeleteObject(brush);        int part;        int state;        if(base::win::GetVersion() < base::win::VERSION_VISTA)        {            part = EP_EDITTEXT;            if(!textfield_->IsEnabled())            {                state = ETS_DISABLED;            }            else if(textfield_->read_only())            {                state = ETS_READONLY;            }            else if(!contains_mouse_)            {                state = ETS_NORMAL;            }            else            {                state = ETS_HOT;            }        }        else        {            part = EP_EDITBORDER_HVSCROLL;            if(!textfield_->IsEnabled())            {                state = EPSHV_DISABLED;            }            else if(GetFocus() == m_hWnd)            {                state = EPSHV_FOCUSED;            }            else if(contains_mouse_)            {                state = EPSHV_HOT;            }            else            {                state = EPSHV_NORMAL;            }            // Vista doesn't appear to have a unique state for readonly.        }        int classic_state =            (!textfield_->IsEnabled() || textfield_->read_only()) ? DFCS_INACTIVE : 0;        gfx::NativeThemeWin::instance()->PaintTextField(hdc, part, state, classic_state,            &window_rect, bg_color_, false, true);        // NOTE: I tried checking the transparent property of the theme and invoking        // drawParentBackground, but it didn't seem to make a difference.        ReleaseDC(hdc);    }

// Handles OS messages, is driven by the 'main loop' above.LRESULT CALLBACK MainWindowProcedure(HWND windowHandle, UINT messageCode, WPARAM wParam, LPARAM lParam){	switch (messageCode) {	// On window creation.	case WM_CREATE:		DEBUG_OUT(TEXT("WM_CREATE message"));		// Start game loop timer.		DEBUG_VAL(TEXT("SetTimer()"), SetTimer(windowHandle, MAIN_CYCLE_TIMER_ID, MAIN_CYCLE_WAIT, NULL));		break;		// Upon redraw request or something else changing we draw the window.	case WM_PAINT:		{			PAINTSTRUCT paintJobStruct;			HDC deviceContextHandle = BeginPaint(windowHandle, &paintJobStruct);			HDC bufferDeviceContextHandle = CreateCompatibleDC(deviceContextHandle);			HBITMAP bufferBitmapHandle = CreateCompatibleBitmap(deviceContextHandle, MAIN_WINDOW_WIDTH, MAIN_WINDOW_HEIGHT);			HGDIOBJ oldBufferBitmapHandle = SelectObject(bufferDeviceContextHandle, bufferBitmapHandle);			Gdiplus::Graphics graphics(bufferDeviceContextHandle);			graphics.SetSmoothingMode(GRAPHICS_SMOOTHING_MODE);			DrawGame(graphics, *mainGameObject);			BitBlt(deviceContextHandle, 0, 0, MAIN_WINDOW_WIDTH, MAIN_WINDOW_HEIGHT, bufferDeviceContextHandle, 0, 0, SRCCOPY);			SelectObject(bufferDeviceContextHandle, oldBufferBitmapHandle);			DeleteDC(bufferDeviceContextHandle);			DeleteObject(bufferBitmapHandle);			EndPaint(windowHandle, &paintJobStruct);		}		break;		// When a user presses a key (can be triggered by auto-repeat).	case WM_KEYDOWN:		DEBUG_OUT(TEXT("WM_KEYDOWN message"));		DEBUG_VAL(TEXT("wParam"), wParam);		switch(wParam) {		case VK_LEFT:		case VK_UP:		case VK_RIGHT:		case VK_DOWN:			DEBUG_OUT(TEXT("Arrow key pressed"));			mainGameObject->Input(wParam);		}		break;			case WM_TIMER:		if (wParam == MAIN_CYCLE_TIMER_ID) {			// This is where the 'main game loop' kicks in.  This line should be reached at a frequency of about 60Hz.			mainGameObject->Step(windowHandle);			RedrawWindow(windowHandle, NULL, NULL, RDW_INVALIDATE);			//InvalidateRect(windowHandle, NULL, TRUE);			//UpdateWindow(windowHandle);		}		break;			case WM_CLOSE:		DEBUG_OUT(TEXT("WM_CLOSE message"));		// Clean up Windows API objects and etc.		KillTimer(windowHandle, MAIN_CYCLE_TIMER_ID);		DestroyWindow(windowHandle);		break;			case WM_DESTROY:		PostQuitMessage(0);		break;			default:		return DefWindowProc(windowHandle, messageCode, wParam, lParam);		break;	}	return 0;}

static void drawbmp(fz_context *ctx, fz_document *doc, fz_page *page, fz_display_list *list, int pagenum, fz_cookie *cookie){	float zoom;	fz_matrix ctm;	fz_irect ibounds;	fz_rect bounds, tbounds;	int w, h;	fz_device *dev;	HDC dc, dc_main;	RECT rc;	HBRUSH bg_brush;	HBITMAP hbmp;	BITMAPINFO bmi = { 0 };	int bmp_data_len;	unsigned char *bmp_data;	int as_tga = !strstr(output, ".bmp");	fz_bound_page(doc, page, &bounds);	zoom = resolution / 72;	fz_pre_scale(fz_rotate(&ctm, rotation), zoom, zoom);	tbounds = bounds;	fz_round_rect(&ibounds, fz_transform_rect(&tbounds, &ctm));	w = width;	h = height;	if (res_specified)	{		fz_round_rect(&ibounds, &tbounds);		if (w && ibounds.x1 - ibounds.x0 <= w)			w = 0;		if (h && ibounds.y1 - ibounds.y0 <= h)			h = 0;	}	if (w || h)	{		float scalex = w / (tbounds.x1 - tbounds.x0);		float scaley = h / (tbounds.y1 - tbounds.y0);		fz_matrix scale_mat;		if (w == 0)			scalex = fit ? 1.0f : scaley;		if (h == 0)			scaley = fit ? 1.0f : scalex;		if (!fit)			scalex = scaley = min(scalex, scaley);		fz_concat(&ctm, &ctm, fz_scale(&scale_mat, scalex, scaley));		tbounds = bounds;		fz_transform_rect(&tbounds, &ctm);	}	fz_round_rect(&ibounds, &tbounds);	fz_rect_from_irect(&tbounds, &ibounds);	w = ibounds.x1 - ibounds.x0;	h = ibounds.y1 - ibounds.y0;	dc_main = GetDC(NULL);	dc = CreateCompatibleDC(dc_main);	hbmp = CreateCompatibleBitmap(dc_main, w, h);	DeleteObject(SelectObject(dc, hbmp));	SetRect(&rc, 0, 0, w, h);	bg_brush = CreateSolidBrush(RGB(0xFF,0xFF,0xFF));	FillRect(dc, &rc, bg_brush);	DeleteObject(bg_brush);	dev = fz_new_gdiplus_device(ctx, dc, &tbounds);	if (list)		fz_run_display_list(list, dev, &ctm, &tbounds, cookie);	else		fz_run_page(doc, page, dev, &ctm, cookie);	fz_free_device(dev);	bmi.bmiHeader.biSize = sizeof(bmi.bmiHeader);	bmi.bmiHeader.biWidth = w;	bmi.bmiHeader.biHeight = as_tga ? -h : h;	bmi.bmiHeader.biPlanes = 1;	bmi.bmiHeader.biBitCount = as_tga ? 32 : 24;	bmi.bmiHeader.biCompression = BI_RGB;	bmp_data_len = as_tga ? w * h * 4 : ((w * 3 + 3) / 4) * 4 * h;	bmp_data = fz_malloc(ctx, bmp_data_len);	if (!GetDIBits(dc, hbmp, 0, h, bmp_data, &bmi, DIB_RGB_COLORS))		fz_throw(ctx, "cannot draw page %d in PDF file '%s'", pagenum, filename);	DeleteDC(dc);	ReleaseDC(NULL, dc_main);	DeleteObject(hbmp);	if (output)	{		char buf[512];		FILE *f;		sprintf(buf, output, pagenum);		f = fopen(buf, "wb");		if (!f)			fz_throw(ctx, "could not create raster file '%s'", buf);		if (as_tga)		{//.........这里部分代码省略.........

HFONT CATCodeMgr::CheckFont( HDC hdc ){	HFONT hRetVal = NULL;	TEXTMETRIC tm;	BOOL bRes = GetTextMetrics(hdc, &tm);	// 
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