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December 31, 2011 Mixing D and C - Windows | ||||
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C program loads D dll
or
D program loads C dll
Is it possible?
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D
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December 31, 2011 Re: Mixing D and C - Windows | ||||
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Posted in reply to DNewbie | On Saturday, 31 December 2011 at 19:05:44 UTC, DNewbie wrote: > C program loads D dll > or > D program loads C dll > Is it possible? Both are possible. Here's how to create a DLL in D, usable from C: http://dlang.org/dll.html As for loading C symbols in a DLL from a D program, you must link against an import library of the DLL, and create an interface module (similar to a header file) with the C declarations. For example, if this is your C DLL: ----------- #include <stdio.h> __declspec(dllexport) void sayHello(const char* name) { printf("hello, %s!", name); } ----------- Then your D interface module should look like this: ----------- extern(C) void sayHello(const char* name); ----------- The import library must be in the OMF format. The easiest way to get such an import library is to use the `impllib` tool which can be downloaded from here: http://ftp.digitalmars.com/bup.zip |
January 01, 2012 Re: Mixing D and C - Windows | ||||
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Posted in reply to Jakob Ovrum | Jakob Ovrum Wrote: > As for loading C symbols in a DLL from a D program, you must link against an import library of the DLL, and create an interface module (similar to a header file) with the C declarations. Alternatively, you can load the DLL via the Windows API. http://msdn.microsoft.com/en-us/library/windows/desktop/ms684175%28v=vs.85%29.aspx |
January 03, 2012 Re: Mixing D and C - Windows | ||||
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Posted in reply to Exec | Thank you both. I've created a D DLL [http://dlang.org/dll.html], then I've loaded it from a C program [compiled with dmc]. However, I'd want to be able to call it from a C program compiled with MSVC, and I got a link error - unresolved external symbol [link testdll.obj /implib:mydll.lib /out:testdll-msvc.exe]. The LoadLibrary works with both DMC/MSVC, but it isn't 'handy'.?. On Sat, Dec 31, 2011, at 07:20 PM, Exec wrote: > Jakob Ovrum Wrote: > > As for loading C symbols in a DLL from a D program, you must link against an import library of the DLL, and create an interface module (similar to a header file) with the C declarations. > Alternatively, you can load the DLL via the Windows API. http://msdn.microsoft.com/en-us/library/windows/desktop/ms684175%28v=vs.85%29.aspx > -- D |
January 03, 2012 Re: Mixing D and C - Windows | ||||
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Posted in reply to DNewbie | On 1/3/2012 10:02 AM, DNewbie wrote: > Thank you both. > > I've created a D DLL [http://dlang.org/dll.html], then I've loaded it from a C program [compiled with dmc]. > However, I'd want to be able to call it from a C program compiled with MSVC, and I got a link error - unresolved external symbol [link testdll.obj /implib:mydll.lib /out:testdll-msvc.exe]. The LoadLibrary works with both DMC/MSVC, but it isn't 'handy'.?. > > That's because the object file formats used by DMC and MSVC are different. DMC outputs OMF, MSCV uses COFF. If you download objconv[1], you can use it to convert between the two formats. Something like objconv -fcoff -nu mydll.lib mydll_mscv.lib should do the trick. [1] http://www.agner.org/optimize/objconv.zip |
January 03, 2012 Re: Mixing D and C - Windows | ||||
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Posted in reply to Mike Parker | On 1/3/2012 12:43 PM, Mike Parker wrote:
> On 1/3/2012 10:02 AM, DNewbie wrote:
>> Thank you both.
>>
>> I've created a D DLL [http://dlang.org/dll.html], then I've loaded it
>> from a C program [compiled with dmc].
>> However, I'd want to be able to call it from a C program compiled with
>> MSVC, and I got a link error - unresolved external symbol [link
>> testdll.obj /implib:mydll.lib /out:testdll-msvc.exe]. The LoadLibrary
>> works with both DMC/MSVC, but it isn't 'handy'.?.
>>
>>
>
> That's because the object file formats used by DMC and MSVC are
> different. DMC outputs OMF, MSCV uses COFF. If you download objconv[1],
> you can use it to convert between the two formats. Something like
>
> objconv -fcoff -nu mydll.lib mydll_mscv.lib
>
> should do the trick.
>
> [1] http://www.agner.org/optimize/objconv.zip
Or did you do that already? I just realized that would likely give a corrupt file error, not an unresolved symbol.
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January 03, 2012 Re: Mixing D and C - Windows | ||||
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Posted in reply to Mike Parker | Maybe I'm wrong, but IIRC objconv won't work on import libs. But there are other ways to do it: http://support.microsoft.com/kb/131313 |
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