c - What is the size of HANDLE? -

-

for exercise, @ startupinfo structure. can see last 3 elements has type handle.

so want know size handle has. know size of handle?

the windows handle type isn't opaque type. windows defines couple of properties can depend on. main 1 answer your question: of type void *. windows data types entry on msdn:

handle

a handle object.

this type declared in winnt.h follows:

typedef pvoid handle;

later on in table can see pvoid defined void *.

so handle has same size void *. or in other words, it's 32 bits when using 32-bit compiler , 64 bits when using 64-bit compiler. shouldn't need hard code either of these values in code, instead use sizeof(handle).

the other property of windows handle type obscure, , barely documented: kernel handles the bottom 2 bits zero. shouldn't need depend on in code, , can see never want to. mention completeness , emphasize how microsoft has defined handle more internal implementation detail.


Comments

Post a Comment

Popular posts from this blog

c# - HttpResponseMessage System.InvalidOperationException -

-
quite simple problem i've got easy solve reckon brains. it's tried different queries on google , nothing popped hey that's why here. here error: system.invalidoperationexception basically error thrown on piece of code here string test = response.content.headers.getvalues("location").firstordefault(); location in fiddler looks this: location: https://www.redirecturlishere.com/blah here entire function: private async task<string> getrequest() { //httpcontent postcontent = new stringcontent(post, encoding.ascii, "application/x-www-form-urlencoded"); using (httpresponsemessage response = await httpclient.getasync( "http://www.cant-share-url.com")) { using (httpcontent content = response.content) { string test = response.content.headers.getvalues("location").firstordefault(); } } return ""; ...
Read more

sql - Postgresql error: "failed to find conversion function from unknown to text" -

-
i have following postgresql query: ( select '201405mase04' testid, count(*) totq, count(distinct case when se1 = '' null else se1 end) totse, case when count(*)=0 7 else count(distinct rc) end totrc eivtestitems ti, eivtests t ti.test_id = t.test_id , t.test_type_id = 1 , t.test_id= '201405mase04' , ti.omit <> 1 ), b ( select '201405mase04' testid, count(*) totq eivtestitems ti, eivtests t ti.test_id = t.test_id , t.test_type_id = 1 , t.test_id= '201405mase04' , ti.omit = 1 ), c ( select '201405mase04' testid, count(*) totq eivtestitems ti, eivtests t ti.test_id = t.test_id , t.test_type_id = 1 , t.test_id= '201405mase04' , ti....
Read more