c++ - GDI Screenshot, results varying on different computer -

-

i try take screenshot gdi, use in ffmpeg. screenshot works , ffmpeg handle without problem.

but, on computer, image not want can see below.

enter image description here

here code use init bitmap :

//-- mimagebuffer = new unsigned char[mwxhxs]; memset(mimagebuffer, 0, mwxhxs); //-- hscreendc = getdc(0); hmemorydc = createcompatibledc(hscreendc); //-- bi.bmiheader.bisize = sizeof(bitmapinfoheader); bi.bmiheader.bibitcount = 24; bi.bmiheader.biwidth = mwidth; bi.bmiheader.biheight = mheight; bi.bmiheader.bicompression = bi_rgb; bi.bmiheader.biplanes = 1; bi.bmiheader.biclrused = 24; bi.bmiheader.biclrimportant = 256; hbitmap = createdibsection(hmemorydc, &bi, dib_rgb_colors, &mimagebuffer, 0, 0); selectobject(hmemorydc, hbitmap);

and here each screenshot :

if(bitblt(     hmemorydc,     0,     0,     mwidth,     mheight,     hscreendc,     mpx,     mpy,     srccopy | captureblt ))

i not have error running application ugly image , on computer. don't know difference causing on these computer (all win7, aero actived...). not understand because code follow example found...

please me !

you creating device-independent-bitmap (createdibsection) using device dependent context (createcompatibledc) work it. believe need create device dependent bitmap compatible bitblt, or use stretchdibits support device-independent image data. reason works on computers , not others because video driver determines format of device-dependent image, may or may not same windows definition of device-independent image.

here example of capturing image (yes, unnecessarily long, still seems contain info): https://msdn.microsoft.com/en-us/library/windows/desktop/dd183402(v=vs.85).aspx

and here documentation on stretchdibits, in case require dib: https://msdn.microsoft.com/en-us/library/windows/desktop/dd145121(v=vs.85).aspx


Comments

Post a Comment

Popular posts from this blog

Hatching array of circles in AutoCAD using c# -

-
i beginner in autocad plugins .i have created array of circle using following code. now, have hatch circles in array .how that??how hatch circles @ once? moreover, how can return hatch method , use hatch objects.sorry language.thanks in advance. [assembly: commandclass(typeof(beamsection.class1))] namespace beamsection { public class class1 { //class1 obj = new class1(); [commandmethod("beamatsupport")] public void addlightweightpolyline() { // current document , database document acdoc = application.documentmanager.mdiactivedocument; database accurdb = acdoc.database; promptpointresult ppr = acdoc.editor.getpoint("\nselect starting point "); var ucs = acdoc.editor.currentusercoordinatesystem; point3d startingpt = ppr.value.transformby(ucs); list<double> radius = new list<double>(); radius.add(0.5);
Read more

ios - UITEXTFIELD InputView Uipicker not working in swift -

-
hello trying pop uipickerview view programmatically when user clicks on textfield. have tried doesn't doing anything. isn't working. nothing happening when click textfield class userprofiletableviewcontroller: uitableviewcontroller,uitextfielddelegate,uipickerviewdelegate,uipickerviewdatasource { var itempicker: uipickerview! = uipickerview() @iboutlet weak var gendertxtfield: uitextfield! var gender = ["male","female"] override func viewdidload() { super.viewdidload() gendertxtfield.delegate = self itempicker!.delegate = self itempicker!.datasource = self itempicker!.backgroundcolor = uicolor.blackcolor() self.gendertxtfield.inputview = itempicker } func numberofcomponentsinpickerview(pickerview: uipickerview) -> int{ return 1 } // returns # of rows in each component.. func pickerview(pickerview: uipickerview, numberofrowsincomponent component:
Read more

Python Pig Latin Translator -

-
so have been working on @ codecademy.com while trying learn python. don't know if blind , can't see why won't work or what. here's code won't let me use. function print variable if had typed in , print "empty" if didn't type anything. print "welcome english pig latin translator!" original = raw_input("what's name?") if len(original) > 0 print original else print "empty" if len(original) > 0 else the above lines contains syntax errors. try: if len(original) > 0: else: note added colons, ( : ).
Read more