c# - Generating IntPtr using Convert.ToInt64 failing on x64 applications -


i'm trying use code popular answer question: using c#, how 1 figure out process locked file?

i'm testing code in windows 7 x64 using vs2010 , .net v4.

i'm finding code excerpt...

var batemp = new byte[nlength]; try {     marshal.copy(iptemp, batemp, 0, nlength);     strobjectname = marshal.ptrtostringuni(is64bits() ? new intptr(iptemp.toint64()) : new intptr(iptemp.toint32())); } catch (accessviolationexception) {     return null; } {     marshal.freehglobal(ipobjectname);     win32api.closehandle(iphandle); }

is causing problems. marshal.copy can fail when address created earlier not valid. code creating address in x64 systems...

if (is64bits()) {     iptemp = new intptr(convert.toint64(objobjectname.name.buffer.tostring(), 10) >> 32); }

in 1 instance of noted failures starts buffer string representation of 20588995036390572032 translates x1c92aa2089e00000. code appears strip low order word leaving x1c92aa20 usaable address.

question 1: why not use 64bit address provided buffer object rather shift out low order word , use high order word in 64bit app running on 64bit os?

question 2: should try/catch/finally block include more accessviolationexception?

read comments on article. unworkable code. doesn't work. don't use. "suggested" corrected version broken (and doesn't work on win8 64bits) , in words of author:

the following produced based on iain ballard's code dump. broken: lock when retrieve handle name. code doesn't contain work-arounds issue, , .net leaves few options: thread.abort can no longer abort thread that's in native method.


Comments

Post a Comment

Popular posts from this blog

matlab - Deleting rows with specific rules -

i got 20*3 cell array , need delete rows contains "137", "2" , "n:t" origin data: 't' '' '' 'np(*)' '' '' [ 137] '' '' [ 2] '' '' 'are' 'and' 'np(fcc_a1#1)' '' '' '1:t' [ 1200] [0.7052] '' [1.2051e+03] [0.7076] '' 'are' 'and' 'np(fcc_a1#3)' '' '' '2:t' [ 1200] [0.0673] '' [1.2051e+03] [0.0671] '' 'are' 'and' 'np(m23c6)' '' '' '3:t' [ 1200] [0.227...
Read more

php - MySQLi multi_query results for later use -

i using mysqli multi_query work several select statemets @ time. know how handle results, able use them later in code. example: <?php //connection stuff $query = "select name, surname database1;"; $query.= "select car, year, type database2 carid='1';"; $query.= "select product, price database3;"; if ($mysqli->multi_query($query)) { if($result = $mysqli->store_result()) { while($row = $result->fetch_row()) { --> here? } } } ?> <html> <div id='persona'> <?php foreach() { --> print name + surname } ?> </div> <div id='cars'> <?php foreach() { --> print car + year + type } ?> </div> <div id='product'> <?php foreach() { --> print product + price } ?> </div> </html> one more thing, prepared statements not possible when using multiple_query, right? there no benefit in putting unrelated queries in 1 multi ...
Read more