自学教程：C++ DFBCHECK函数代码示例

void IDirectFBSurface::SetColor (DFBColor &color){     DFBCHECK( iface->SetColor (iface, color.r, color.g, color.b, color.a) );}

void IDirectFBScreen::GetMixerConfiguration (int                   mixer,                                             DFBScreenMixerConfig *config){     DFBCHECK( iface->GetMixerConfiguration (iface, mixer, config) );}

void IDirectFBInputDevice::GetXY (int *x, int *y){     DFBCHECK( iface->GetXY (iface, x, y) );}

int main( int argc, char *argv[] ){     IDirectFB              *dfb;     IDirectFBDisplayLayer  *layer;     IDirectFBSurface       *bgsurface;     IDirectFBImageProvider *provider;     IDirectFBWindow        *window1;     IDirectFBWindow        *window2;     IDirectFBSurface       *window_surface1;     IDirectFBSurface       *window_surface2;     IDirectFBEventBuffer   *buffer;     DFBDisplayLayerConfig  layer_config;#if ((DIRECTFB_MAJOR_VERSION == 0) && (DIRECTFB_MINOR_VERSION == 9) && (DIRECTFB_MICRO_VERSION < 23))     DFBCardCapabilities    caps;#else     DFBGraphicsDeviceDescription caps;#endif     IDirectFBWindow*       upper;     DFBWindowID            id1;     IDirectFBFont          *font;     int fontheight;     int err;     int quit = 0;     DFBCHECK(DirectFBInit( &argc, &argv ));     DFBCHECK(DirectFBCreate( &dfb ));#if ((DIRECTFB_MAJOR_VERSION == 0) && (DIRECTFB_MINOR_VERSION == 9) && (DIRECTFB_MICRO_VERSION < 23))     dfb->GetCardCapabilities( dfb, &caps );#else     dfb->GetDeviceDescription( dfb, &caps );#endif     dfb->GetDisplayLayer( dfb, DLID_PRIMARY, &layer );     if (!((caps.blitting_flags & DSBLIT_BLEND_ALPHACHANNEL) &&           (caps.blitting_flags & DSBLIT_BLEND_COLORALPHA  )))     {          layer_config.flags = DLCONF_BUFFERMODE;          layer_config.buffermode = DLBM_BACKSYSTEM;          layer->SetConfiguration( layer, &layer_config );     }     layer->GetConfiguration( layer, &layer_config );     layer->EnableCursor ( layer, 1 );     {          DFBFontDescription desc;          desc.flags = DFDESC_HEIGHT;          desc.height = layer_config.width/50;          DFBCHECK(dfb->CreateFont( dfb, PACKAGE_DATA_DIR"/grunge.ttf", &desc, &font ));          font->GetHeight( font, &fontheight );     }     {          DFBSurfaceDescription desc;          DFBCHECK(dfb->CreateImageProvider( dfb,                                             PACKAGE_DATA_DIR"/bg.png",                                             &provider ));          desc.flags = DSDESC_WIDTH | DSDESC_HEIGHT;          desc.width = layer_config.width;          desc.height = layer_config.height;          DFBCHECK(dfb->CreateSurface( dfb, &desc, &bgsurface ) );          provider->RenderTo( provider, bgsurface, NULL );          provider->Release( provider );	  DFBCHECK(bgsurface->SetFont( bgsurface, font ));          bgsurface->SetColor( bgsurface, 0xCF, 0xCF, 0xFF, 0xFF );          bgsurface->DrawString( bgsurface,                                 "Move the mouse over a window to activate it.",                                 -1, 10, 0, DSTF_LEFT | DSTF_TOP );          bgsurface->SetColor( bgsurface, 0xFF, 0xCF, 0xFF, 0xFF );          bgsurface->DrawString( bgsurface,                    "You can drag them around, too, if you want.",                                 -1, 10 , 40, DSTF_LEFT | DSTF_TOP );          bgsurface->SetColor( bgsurface, 0xCF, 0xCF, 0xFF, 0xFF );	  bgsurface->DrawString( bgsurface,                    "The one with funky stuff happening and things flying around is an evas.",                                 -1, 10, 80, DSTF_LEFT | DSTF_TOP );//.........这里部分代码省略.........

	int DFBFontProvider::getMaxAdvance() {		int maxAdvance = 0;		DFBCHECK(font->GetMaxAdvance(font, &maxAdvance));		return maxAdvance;	}

int main(int argc, char *argv[]){	int quit = 0;	DFBResult err;	DFBSurfaceDescription dsc;	DFBCHECK(DirectFBInit(&argc, &argv));	// create the super interface	DFBCHECK(DirectFBCreate(&dfb));	// create an event buffer for all devices with these caps	DFBCHECK(dfb->CreateInputEventBuffer(dfb, DICAPS_KEYS | DICAPS_AXES, DFB_FALSE, &events));	// set our cooperative level to DFSCL_FULLSCREEN for exclusive access to the primary layer	dfb->SetCooperativeLevel(dfb, DFSCL_FULLSCREEN);	// get the primary surface, i.e. the surface of the primary layer we have exclusive access to	dsc.flags = DSDESC_CAPS;	dsc.caps  = DSCAPS_PRIMARY | DSCAPS_DOUBLE | DSCAPS_OPENGL_HINT;	DFBCHECK(dfb->CreateSurface(dfb, &dsc, &primary));	// get the size of the surface and fill it	DFBCHECK(primary->GetSize(primary, &screen_width, &screen_height));	DFBCHECK(primary->FillRectangle(primary, 0, 0, screen_width, screen_height));	primary->Flip(primary, NULL, 0);	// create the default font and set it	DFBCHECK(dfb->CreateFont(dfb, NULL, NULL, &font));	DFBCHECK(primary->SetFont(primary, font));	// get the GL context	DFBCHECK(primary->GetGL(primary, &primary_gl));	DFBCHECK(primary_gl->Lock(primary_gl));	init(argc, argv);	reshape(screen_width, screen_height);	DFBCHECK(primary_gl->Unlock(primary_gl));	T0 = get_millis();	while (!quit)	{		DFBInputEvent evt;		unsigned long t;		DFBCHECK(primary_gl->Lock(primary_gl));		draw();		DFBCHECK(primary_gl->Unlock(primary_gl));		if (fps)		{			char buf[64];			snprintf(buf, 64, "%4.1f FPS/n", fps);			primary->SetColor(primary, 0xff, 0, 0, 0xff);			primary->DrawString(primary, buf, -1, screen_width - 5, 5, DSTF_TOPRIGHT);		}		primary->Flip(primary, NULL, 0);		Frames++;		t = get_millis();		if (t - T0 >= 2000)		{			GLfloat seconds = (t - T0) / 1000.0;			fps = Frames / seconds;			T0 = t;			Frames = 0;		}		while (events->GetEvent(events, DFB_EVENT(&evt)) == DFB_OK)		{			switch (evt.type)			{				case DIET_KEYPRESS:					switch (evt.key_symbol)					{						case DIKS_ESCAPE:							quit = 1;							break;						case DIKS_CURSOR_UP: 							inc_y = 0.1;							break;						case DIKS_CURSOR_DOWN:							inc_y = -0.1;							break;						case DIKS_CURSOR_LEFT:							inc_x = -0.1;							break;//.........这里部分代码省略.........

int main( int argc, char *argv[] ){     char *filename = NULL;     pthread_t demo_loop_thread = (pthread_t) -1;     DFBResult err;     int quit = 0;     if (argc > 1) {        filename = argv[1];     } else {        filename = "./smokey_light.jpg";     }     DFBSurfaceDescription dsc;     srand((long)time(0));     DFBCHECK(DirectFBInit( &argc, &argv ));     /* create the super interface */     DFBCHECK(DirectFBCreate( &dfb ));     /* get an interface to the primary keyboard and create an        input buffer for it *///     DFBCHECK(dfb->GetInputDevice( dfb, DIDID_KEYBOARD, &keyboard ));  //   DFBCHECK(keyboard->CreateEventBuffer( keyboard, &keybuffer ));     /* set our cooperative level to DFSCL_FULLSCREEN for exclusive access to        the primary layer */     err = dfb->SetCooperativeLevel( dfb, DFSCL_FULLSCREEN );     if (err)          DirectFBError( "Failed to get exclusive access", err );     /* get the primary surface, i.e. the surface of the primary layer we have        exclusive access to */     dsc.flags = DSDESC_CAPS;     dsc.caps = DSCAPS_PRIMARY | DSCAPS_DOUBLE | DSCAPS_VIDEOONLY;     DFBCHECK(dfb->CreateSurface( dfb, &dsc, &primary ));     /* set our desired video mode */     DFBCHECK(primary->GetSize( primary, &xres, &yres ));     /* load font */     {          DFBFontDescription desc;          desc.flags = DFDESC_HEIGHT;          desc.height = yres/10;          DFBCHECK(dfb->CreateFont( dfb, "./decker.ttf", &desc, &font ));          DFBCHECK(primary->SetFont( primary, font ));     }     /* load smokey_light */     DFBCHECK(dfb->CreateImageProvider( dfb, filename,                                        &provider ));     DFBCHECK(provider->GetSurfaceDescription (provider, &dsc));     DFBCHECK(dfb->CreateSurface( dfb, &dsc, &smokey_light ));     DFBCHECK(provider->RenderTo( provider, smokey_light, NULL ));     provider->Release( provider );     /* main loop */     while (1) {          DFBInputEvent evt;          if ((int)demo_loop_thread == -1)               pthread_create( &demo_loop_thread, NULL, demo_loop, NULL );	sleep(5);#if (0)          keybuffer->WaitForEvent( keybuffer );          /* process keybuffer */          while (keybuffer->GetEvent( keybuffer, DFB_EVENT(&evt)) == DFB_OK) {               if (evt.type == DIET_KEYPRESS) {                    switch (evt.key_id) {                         case DIKI_ESCAPE:                              /* quit main loop */                              quit = 1;                              pthread_cancel( demo_loop_thread );                              pthread_join( demo_loop_thread, NULL );                              break;                         default:                              break;                    }               }          }#endif     }     smokey_light->Release( smokey_light );     keybuffer->Release( keybuffer );     keyboard->Release( keyboard );     primary->Release( primary );//.........这里部分代码省略.........