.net - trouble linking to de-decorated DLL names in C++ (32 bit) in Visual Studio -


i have library of dsp functions in c++ , want link them dynamically @ run time. using pdll.h method wrap classes (for example fft) c-style functions , load them load on fly in other c++ applications. want use these functions in .net applications , com components, have use __stdcall decorates names in 32 bit builds.

in order undecorate names, using trick mentioned here: c++ dll export: decorated/mangled names (wqw's answer, 2nd down). example, in library's .h file have declared wrapped functions so:

#pragma comment(linker, "/export:dofft=_dofft@12") rtlibs_api dofft(fft* x, double* pddatain, double* pddataout);

this indeed work, , when dll dependency walker, see there both entry dofft , _dofft@12.

the problem have when try build project links library (dynamically, @ run time, not using .lib file @ all) linker errors functions in dll, i.e.:

error   31  error lnk2001: unresolved external symbol _dofft@12

i don't understand why happening. first of all, symbol _dofft@12 exist (according dependency walker) , second of all, why linker looking in first place? linking @ run time, not @ compile time how project know symbol?

all functions declared same chain of macros reduces (e.g.): 

extern "c" __declspec(dllexport) int __stdcall dofft(fft* x){...}

nothing having library declared on client side.


Comments

Post a Comment

Popular posts from this blog

Is there a better way to structure post methods in Class Based Views -

i'm using class based views in django , never specify url in ajax calls , omit action parameter in form because know these requests go through post method of class based view. notice view - profile page make many requests depending on user updating on page - post method become convoluted , if/else mess example: def post(self, request, *args, **kwargs): # handle user changing available date if request.post.get('availabledate') != none: self.updateavailabledate(request) return jsonresponse({'result':'success'}) if request.post.get('newprojectname') != none: creative_user = creativeuserprofile.objects.get(id = request.user.id) project = project.create_project(creative_user, request.post['newprojectname']) project.save() return jsonresponse({'projectid': project.id }) if request.post.get('projectimage') != none , request.files['file']: proj
Read more

performance - Why is XCHG reg, reg a 3 micro-op instruction on modern Intel architectures? -

i'm doing micro-optimization on performance critical part of code , came across sequence of instructions (in at&t syntax): add %rax, %rbx mov %rdx, %rax mov %rbx, %rdx i thought had use case xchg allow me shave instruction , write: add %rbx, %rax xchg %rax, %rdx however, dimay found agner fog's instruction tables , xchg 3 micro-op instruction 2 cycle latency on sandy bridge, ivy bridge, broadwell, haswell , skylake. 3 whole micro-ops , 2 cycles of latency! 3 micro-ops throws off 4-1-1-1 cadence , 2 cycle latency makes worse original in best case since last 2 instructions in original might execute in parallel. now... cpu might breaking instruction micro-ops equivalent to: mov %rax, %tmp mov %rdx, %rax mov %tmp, %rdx where tmp anonymous internal register , suppose last 2 micro-ops run in parallel latency 2 cycles. given register renaming occurs on these micro-architectures, though, doesn't make sense me done way. why wouldn't register renamer
Read more

jquery - Responsive Navbar with Sub Navbar -

good day, forgive me nav vocabulary not best. if question confusing apologize. i'm working on navigation bar needs centered on page @ 768px , above. items in nav open (or perhaps toggle) subnav lives directly below. these nav should appear centered on page. i have been able work through responsive portion of nav bar, having main items align vertically , sub nav menu of each item roll out below, , gave them indent separation. working well. however, issue not responsive side, behavior @ width greater 768px. happens toggling menu's sub navigation pushes other main items down page below sub nav. here's code: $(document).ready(function () { //stick in fixed 100% height behind navbar don't wrap $('#slide-nav.navbar-inverse').after($('<div class="inverse" id="navbar-height-col"></div>')); $('#slide-nav.navbar-default').after($('<div id="navbar-height-col"></d
Read more