iphone privateapi - IOSurface - IOS Private API - Capture screenshot in background -

i want capture screenshot background service. private api fine don't need submit app store. have tried uigetscreenimage , not work background app.

i using following code got so. iosurfacecreate returns null me. appreciated.

cfmutabledictionaryref dict;         iosurfaceref screensurface = null;          char pixelformat[4] = {'a','r','g','b'};         dict = cfdictionarycreatemutable(kcfallocatordefault, 0, &kcftypedictionarykeycallbacks, &kcftypedictionaryvaluecallbacks);          uint32_t width ;         uint32_t height;         void *pitch;         void *bpe;         void *size;         cfdictionarysetvalue(dict, kiosurfaceisglobal, kcfbooleantrue);         cfdictionarysetvalue(dict, kiosurfacebytesperrow, cfnumbercreate(kcfallocatordefault, kcfnumbersint32type, &pitch));         cfdictionarysetvalue(dict, kiosurfacebytesperelement, cfnumbercreate(kcfallocatordefault, kcfnumbersint32type, &bpe));         cfdictionarysetvalue(dict, kiosurfacewidth, cfnumbercreate(kcfallocatordefault, kcfnumbersint32type, &width));         cfdictionarysetvalue(dict, kiosurfaceheight, cfnumbercreate(kcfallocatordefault, kcfnumbersint32type, &height));         cfdictionarysetvalue(dict, kiosurfacepixelformat, cfnumbercreate(kcfallocatordefault, kcfnumbersint32type, pixelformat));         cfdictionarysetvalue(dict, kiosurfaceallocsize, cfnumbercreate(kcfallocatordefault, kcfnumbersint32type, &size));          iosurfaceref destsurf = iosurfacecreate(dict);         iosurfaceacceleratorref outacc;         iosurfaceacceleratorcreate(null, 0, &outacc);          cfdictionaryref ed = (__bridge cfdictionaryref)[nsdictionary dictionarywithobjectsandkeys: nil];         iosurfaceacceleratortransfersurface(outacc, screensurface, destsurf, ed, null);         uint32_t aseed;         iosurfaceunlock(screensurface, kiosurfacelockreadonly, &aseed);          cgdataproviderref provider = cgdataprovidercreatewithdata(null, iosurfacegetbaseaddress(destsurf), (width*height*4), null);         cgimageref cgimage=cgimagecreate(width, height, 8, 8*4, iosurfacegetbytesperrow(destsurf), cgcolorspacecreatedevicergb(), kcgimagealphanoneskipfirst | kcgbitmapbyteorder32little, provider, null, yes, kcgrenderingintentdefault);         uiimage *image = [uiimage imagewithcgimage: cgimage];         uiimagewritetosavedphotosalbum(image, self_object, nil, nil);         cgimagerelease(cgimage);         cfrelease(destsurf); 

after combining code 2 places, able save photo photo album (with application in background).

iosurfaces - artefacts in video , unable grab video surfaces

https://github.com/tomcool420/smframework/blob/master/smfscreencapture.m

please try out , let me know if works you.

-(void)savephoto {     iomobileframebufferconnection connect;     kern_return_t result;     iosurfaceref screensurface = null;      io_service_t framebufferservice = ioservicegetmatchingservice(kiomasterportdefault, ioservicematching("appleh1clcd"));     if(!framebufferservice)         framebufferservice = ioservicegetmatchingservice(kiomasterportdefault, ioservicematching("applem2clcd"));     if(!framebufferservice)         framebufferservice = ioservicegetmatchingservice(kiomasterportdefault, ioservicematching("appleclcd"));      result = iomobileframebufferopen(framebufferservice, mach_task_self(), 0, &connect);      result = iomobileframebuffergetlayerdefaultsurface(connect, 0, &screensurface);      uint32_t aseed;     iosurfacelock(screensurface, kiosurfacelockreadonly, &aseed);     uint32_t width = iosurfacegetwidth(screensurface);     uint32_t height = iosurfacegetheight(screensurface);     //int m_width = 320;     //int m_height = 480;     cfmutabledictionaryref dict;     int pitch = width*4, size = width*height*4;     int bpe=4;     char pixelformat[4] = {'a','r','g','b'};     dict = cfdictionarycreatemutable(kcfallocatordefault, 0, &kcftypedictionarykeycallbacks, &kcftypedictionaryvaluecallbacks);     cfdictionarysetvalue(dict, kiosurfaceisglobal, kcfbooleantrue);     cfdictionarysetvalue(dict, kiosurfacebytesperrow, cfnumbercreate(kcfallocatordefault, kcfnumbersint32type, &pitch));     cfdictionarysetvalue(dict, kiosurfacebytesperelement, cfnumbercreate(kcfallocatordefault, kcfnumbersint32type, &bpe));     cfdictionarysetvalue(dict, kiosurfacewidth, cfnumbercreate(kcfallocatordefault, kcfnumbersint32type, &width));     cfdictionarysetvalue(dict, kiosurfaceheight, cfnumbercreate(kcfallocatordefault, kcfnumbersint32type, &height));     cfdictionarysetvalue(dict, kiosurfacepixelformat, cfnumbercreate(kcfallocatordefault, kcfnumbersint32type, pixelformat));     cfdictionarysetvalue(dict, kiosurfaceallocsize, cfnumbercreate(kcfallocatordefault, kcfnumbersint32type, &size));      iosurfaceref destsurf = iosurfacecreate(dict);      void* outacc;     iosurfaceacceleratorcreate(null, 0, &outacc);      iosurfaceacceleratortransfersurface(outacc, screensurface, destsurf, dict, null);      iosurfaceunlock(screensurface, kiosurfacelockreadonly, &aseed);     cfrelease(outacc);      cgdataproviderref provider = cgdataprovidercreatewithdata(null, iosurfacegetbaseaddress(destsurf), (width * height * 4), null);     cgimageref cgimage=cgimagecreate(width, height, 8,                                      8*4, iosurfacegetbytesperrow(destsurf),                                      cgcolorspacecreatedevicergb(), kcgimagealphanoneskipfirst |kcgbitmapbyteorder32little,                                      provider, null,                                      yes, kcgrenderingintentdefault);     uiimage *img = [uiimage imagewithcgimage:cgimage];     uiimagewritetosavedphotosalbum(img, self, nil, nil);      // relevant part of code      //cvpixelbuffercreatewithbytes(null, width, height, kcvpixelformattype_32bgra, iosurfacegetbaseaddress(destsurf), iosurfacegetbytesperrow(destsurf), null, null, null, &samplebuffer); }