Featured post

c# - Usage of Server Side Controls in MVC Frame work -

-
i using asp.net 4.0 , mvc 2.0 web application. project requiremrnt have use server side control in application not possibl in noraml case. ideally want use adrotator control , datalist control. i saw few samples , references in codepleax mvc controllib howwver found less useful. can tell how utilize theese controls in asp.net application along mvc. note: please provide functionalities related adrotator , datalist controls not equivalent functionalities thanks in advace. mvc pages not use normal .net solution makes use of normal .net components impossible. a normal .net page use event driven solution call different methods service side mvc use actions , view completly different way handle things. also, mvc not use viewstate normal .net controlls require. found article discussing mixing of normal .net , mvc.
3 comments

compiler construction - Detect undefined symbols in C header file -

-

suposse coded c library provides bunch of "public" functions, declared in mylib.h header file. functions supposedly implemented in (say) mylib.c file compiled (say) static lib mylib.c -> mylib.o -> mylib.a.

is there way detect forgot provide implementation of declared function in mylib.h? (yes, know unit testing, practices, etc - and, yes, understand meaning of plain function declaration in c).

suppose mylib.h declares void func1(); , function not coded in provided library. trigger error if linker needs use function. otherwise, compile ok , without warnings - afaik. there way (perhaps compiler dependent) trigger warning declared not implemented functions, or there other way deal issue?

btw: nm -u lists not undefined declared functions, "used" library, i.e., functions trigger error in linking phase if not declared somewhere. (which makes sense, library object file not know header files, of course.)

basically, reliable way have program (or possibly series of programs) formally exercise each , every 1 of functions. if 1 of programs fails link because of missing symbol, you've goofed.

i suppose try editing copy of header source file (as in, file ending .c), converting function declarations dummy function definitions:

original:

extern int somefunc(void);

revised:

extern int somefunc(void){}

then compile modified source minimum warnings - , ignore "function supposed return value doesn't". compare defined symbols in object file revised source defined symbols in library (using nm -g on unix-like systems). present in object file isn't present in library missing , should supplied.

note: if header includes other headers of own define functions, need process of those. if header includes standard headers such <stdio.h>, won't defining functions such fopen() or printf() in ordinary course of events. so, choose headers reprocess source code carefully.


Comments

Post a Comment

Popular posts from this blog

c# - Usage of Server Side Controls in MVC Frame work -

-
i using asp.net 4.0 , mvc 2.0 web application. project requiremrnt have use server side control in application not possibl in noraml case. ideally want use adrotator control , datalist control. i saw few samples , references in codepleax mvc controllib howwver found less useful. can tell how utilize theese controls in asp.net application along mvc. note: please provide functionalities related adrotator , datalist controls not equivalent functionalities thanks in advace. mvc pages not use normal .net solution makes use of normal .net components impossible. a normal .net page use event driven solution call different methods service side mvc use actions , view completly different way handle things. also, mvc not use viewstate normal .net controlls require. found article discussing mixing of normal .net , mvc.
Read more

ios - Very simple iPhone App crashes on UILabel settext -

-
i have simple application. have button , label in ib. have ibaction onclick calls settext on label. there's outlet label. connected in ib. crashes app first time in simulator. when launch again, sets text. crashes again next time. crashes on actual device. should simple, i'm not sure i'm doing wrong. thanks. in .h file : #import <uikit/uikit.h> @interface untitledviewcontroller : uiviewcontroller { iboutlet uilabel *label; iboutlet uibutton *button; } @property (nonatomic, retain) uilabel *label; -(ibaction) onclick1: (id) sender; @end and in .m: - (ibaction) onclick1: (id) sender { //[label settext:@"hello world!"]; label.text = @"hello world!"; //[button settitle:@"clicked" forstate:uicontrolstatenormal]; } sorry, i'm new site. how crash log , stack? thanks. edit : while answer technically correct, doesn't answer question @ :( sorry < warning - guess > if you're...
Read more

mysql - Why there can be only one TIMESTAMP column with CURRENT_TIMESTAMP in DEFAULT clause? -

-
why there can 1 timestamp column current_timestamp in default or on update clause? create table `foo` ( `productid` int(10) unsigned not null, `addeddate` timestamp not null default current_timestamp, `updateddate` timestamp not null default current_timestamp on update current_timestamp ) engine=innodb; the error results: error code : 1293 incorrect table definition; there can 1 timestamp column current_timestamp in default or on update clause this limitation, due historical, code legacy reasons, has been lifted in recent versions of mysql: changes in mysql 5.6.5 (2012-04-10, milestone 8) previously, @ 1 timestamp column per table automatically initialized or updated current date , time. restriction has been lifted. timestamp column definition can have combination of default current_timestamp , on update current_timestamp clauses. in addition, these clauses can used datetime column definitions. more information, see automati...
Read more