telerik - C#: The unmanaged method SendInput does not work with different representation of the structure -


this problem come me telerik testing framework.
telerik testing framework try simulate mouse click using method sendinput interact application, mouse click not occur.

under hood telerik code looks like

       [structlayout(layoutkind.explicit)]     public struct input     {         [fieldoffset(0)]         public int type;         [fieldoffset(4)]         public mouseinput mi;     }      [structlayout(layoutkind.sequential)]     public struct mouseinput     {         public int dx;         public int dy;         public uint mousedata;         public uint dwflags;         public uint time;         public intptr dwextrainfo;     }      public static void mouseclick()     {         var leftdown = new input();         leftdown.type = 0;         leftdown.mi.dwflags = 2;         sendinput(1, ref leftdown, marshal.sizeof(leftdown));           var leftup = new input();         leftup.type = 0;         leftup.mi.dwflags = 4;         sendinput(1, ref leftup, marshal.sizeof(leftup));     }     [dllimport("user32.dll", setlasterror = true)]     static extern uint sendinput(uint ninputs, ref input pinputs, int cbsize);

but if change input structure layoutkind.explicit layoutkind.sequential works fine, example:

[structlayout(layoutkind.sequential)] public struct input {     public int type;     public mouseinput mi; }

in opinion both variant must work, because in memory represented same.

any idea why input layoutkind.explicit not work?

on 64 bit system, mouseinput has alignment of 8 because dwextrainfo has alignment of 8. means correct offset on 64 bit system 8 rather 4. if switch sequential layout c# compiler able place mouseinput struct @ correct location.

that said, don't care version either. input struct size field, followed union of mouseinput, keybdinput , hardwareinput. including mouseinput relies on mouseinput having same alignment other 2 members of union, , having alignment greater or equal of 2 omitted structs.

i suggest use declaration of input found here: https://stackoverflow.com/a/6833311/505088


Comments

Post a Comment

Popular posts from this blog

python - Operations inside variables -

this question has answer here: evaluating mathematical expression in string 12 answers i want make python script finds maximum possible output using 2 operations. problem says there syntax error @ 2nd last line, in b in there. how can fix it? x = 0 = int(input("1st number:")) c = int(input("2nd number:" )) e = int(input("3rd number:" )) in range(4): if == 0: b = "+" elif == 1: b = "-" elif == 2: b = "/" else: b = "*" j in range(4): if j == 0: d = "+" elif j == 1: d = "-" elif j == 2: d = "/" else: d = "*" k = b c d e print(k) if you're after variables e on single line, couldn...
Read more

Generic Map Parameter java -

i having lot of methods of type: public static list<eduusers> getdetails(class c, map<string, integer> params) { list<eduusers> details = null; session session = hibernateutil.getsessionfactory().opensession(); transaction tx = null; try { tx = session.begintransaction(); criteria cr = session.createcriteria(c); (map.entry<string, integer> entry : params.entryset()) { cr.add(restrictions.eq(entry.getkey(), entry.getvalue())); } details = cr.list(); tx.commit(); } catch (exception asd) { log.debug(asd.getmessage()); if (tx != null) { tx.commit(); } } { session.close(); } return details; } i trying have generic method them , have written far: public static <t> list<t> getdetails(class<t> c, class<t> b) { l...
Read more

arrays - What causes a java.lang.ArrayIndexOutOfBoundsException and how do I prevent it? -

what arrayindexoutofboundsexception mean , how rid of it? here code sample triggers exception: string[] name = {"tom", "dick", "harry"}; for(int = 0; i<=name.length; i++) { system.out.print(name[i] +'\n'); } your first port of call should documentation explains reasonably clearly: thrown indicate array has been accessed illegal index. index either negative or greater or equal size of array. so example: int[] array = new int[5]; int boom = array[10]; // throws exception as how avoid it... um, don't that. careful array indexes. one problem people run thinking arrays 1-indexed, e.g. int[] array = new int[5]; // ... populate array here ... (int index = 1; index <= array.length; index++) { system.out.println(array[index]); } that miss out first element (index 0) , throw exception when index 5. valid indexes here 0-4 inclusive. correct, idiomatic for statement here be: for (int index = 0; index <...
Read more