c# - Bitmap.FromHbitmap erroring when called over RDP -

-

our application cursor manipulation enable "relatively" nice drag drop animation on winforms (at time wpf wasn't option). when using application on rdp session throws generic gdi+ exception.

the method throws this:

[dllimport("user32")] private static extern bool geticoninfo(intptr hicon, out iconinfo piconinfo);  [dllimport("user32.dll")] private static extern intptr loadcursorfromfile(string lpfilename);  [dllimport("user32.dll", setlasterror = true)] public static extern bool destroyicon(intptr hicon);  [dllimport("gdi32.dll", setlasterror = true)] private static extern bool deleteobject(intptr hobject);  public static bitmap bitmapfromcursor(cursor cur) {     iconinfo iinfo;     geticoninfo(cur.handle, out iinfo);      bitmap bmp = bitmap.fromhbitmap(iinfo.hbmcolor);     deleteobject(iinfo.hbmcolor);     deleteobject(iinfo.hbmmask);      bitmapdata bmdata = bmp.lockbits(new rectangle(0, 0, bmp.width, bmp.height), imagelockmode.readonly, bmp.pixelformat);     bitmap dstbitmap = new bitmap(bmdata.width, bmdata.height, bmdata.stride, pixelformat.format32bppargb, bmdata.scan0);     bmp.unlockbits(bmdata);      return new bitmap(dstbitmap); }

specifically line:

bitmap bmp = bitmap.fromhbitmap(iinfo.hbmcolor);

when debugging hbmcolor 0, means when running on rdp call geticoninfo doesn't return required information.

i can check 0 , handle special case, there can make work on rdp normally?

edit

here's iconinfo structure:

[structlayout(layoutkind.sequential)] struct iconinfo {      public bool ficon;         // specifies whether structure defines icon or cursor. value of true specifies                     // icon; false specifies cursor.      public int32 xhotspot;     // specifies x-coordinate of cursor's hot spot. if structure defines icon, hot                     // spot in center of icon, , member ignored.      public int32 yhotspot;     // specifies y-coordinate of cursor's hot spot. if structure defines icon, hot                     // spot in center of icon, , member ignored.      public intptr hbmmask;     // (hbitmap) specifies icon bitmask bitmap. if structure defines black , white icon,                     // bitmask formatted upper half icon , bitmask , lower half                     // icon xor bitmask. under condition, height should multiple of two. if                     // structure defines color icon, mask defines , bitmask of icon.      public intptr hbmcolor;    // (hbitmap) handle icon color bitmap. member can optional if                     // structure defines black , white icon. , bitmask of hbmmask applied srcand                     // flag destination; subsequently, color bitmap applied (using xor)                     // destination using srcinvert flag. }

from habjan's answer below i've added comments p/invoke structure above. looks hbmmask contains bitmap reference i'm after, i'm afraid bit manipulation skills rather rusty. when p/invoke says upper half / lower half - inferring to?

is possible black , white bitmap this?

i think due rdp color depth. if cursor black , white (via rdp), not hbmcolor value parameter optional.

msdn says:

hbmcolor  type: hbitmap

description: handle icon color bitmap. member can optional if structure defines black , white icon. , bitmask of hbmmask applied srcand flag destination; subsequently, color bitmap applied (using xor) destination using srcinvert flag.

edit:

public static bitmap bitmapfromcursor(cursor cur) {     iconinfo iinfo;     geticoninfo(cur.handle, out iinfo);      bitmap bmpcolor = null;      if (iinfo.hbmcolor != intptr.zero) {        bmpcolor = bitmap.fromhbitmap(iinfo.hbmcolor);     }     else {        bmpcolor = new bitmap(w,h);        // fill bmpcolor white colour     }      bitmap bmpmask = bitmap.fromhbitmap(iinfo.hbmmask);     deleteobject(iinfo.hbmcolor);     deleteobject(iinfo.hbmmask);      // apply mask bitmap color bitmap:     // http://stackoverflow.com/questions/3654220/alpha-masking-in-c-sharp-system-drawing      bitmapdata bmdata = bmp.lockbits(new rectangle(0, 0, bmp.width, bmp.height), imagelockmode.readonly, bmp.pixelformat);     bitmap dstbitmap = new bitmap(bmdata.width, bmdata.height, bmdata.stride, pixelformat.format32bppargb, bmdata.scan0);     bmp.unlockbits(bmdata);      return new bitmap(dstbitmap); }

... did not test code, it's give brief info do...


Comments

Post a Comment

Popular posts from this blog

C# random value from dictionary and tuple -

-
i have following code, , need random item contains string "region_1" dictionary. public static dictionary<int, tuple<string, int, currencytype>> itemarray = new dictionary<int, tuple<string, int, currencytype>>() { { 0xb3e, new tuple<string, int, currencytype>("region_1", 1500, currencytype.fame) } }; public static int generateitemid(string shopid) { var generateditem = itemarray.elementat(new random().next(0, itemarray.count)).key; } how select this? it's not possible efficiently... first create static random @ class level... prevent non-random behaviour if run query on short period of time... (it's seeded discrete clock) static random rnd = new random(); then: var item = itemarray.values .where(t => t.item1 == shopid) .orderby(_ => rnd.next()) .firstordefault()
Read more

cgi - How do I interpret URLs without extension as files rather than missing directories in nginx? -

-
so i'm trying install zoneminder , have run under nginx, has few compiled files need run using fast-cgi. these files lack extension. if file has extension, there no issue , nginx interprets file , return 404 if can't find it. if has no extension, assume it's directory , return 404 when can't find sort of index page. here have now: # security camera domain. server { listen 888; server_name mydomain.com; root /srv/http/zm; # enable php support. include php.conf; location / { index index.html index.htm index.php; } # enable cgi support. location ~ ^/cgi-bin/(.+)$ { alias /srv/cgi-bin/zm/; fastcgi_pass unix:/run/fcgiwrap.sock; fastcgi_param script_filename $document_root/$1; include fastcgi.conf; } } the idea is, under cgi-bin directory goes through fastcgi pipe. any idea on howi can fix this? upon closer inspection, realized zoneminder has 2 cgi sc...
Read more

.htaccess - htaccess convert request to clean url and add slash at the end of the url -

-
ok , searched more 4 days , more 20 posts here in stach or in websites without kind of success first here htaccess file rewriteengine on rewriterule ^([a-za-z0-9_]+)/?$ index.php?page=$1 [nc] rewriterule ^([a-za-z0-9_]+)\/([a-za-z0-9_]+)\/?$ index.php?page=$1&action=$2 [nc] i tried many codes 1 worked me can call request , works me www.example.com/pagename => www.example.com/index.php?page=pagename here questions , please provide me information "in detail" understand code well 1- how convert request automatically www.example.com/index.php?page=pagename www.example.com/pagename 2- if tried add slash @ end shows me page without images or styling mean www.example.com/pagename => works www.example.com/pagename/ => doesn't work that's :) for first part need 301 rule this: rewritecond %{the_request} /index\.php\?page=([^\s&]+) [nc] rewriterule ^ /%1? [r=301,l] for second part use absolute path in css, js, images files r...
Read more