CSharp/C#, Problems with DllImport

Problems with DllImport

Author	Message
Henk #1 / 8	Problems with DllImport Hi! I'm trying to import a function from a Win32-dll in C#, but I get an exception telling me "Unable to find an entry point named fnDllTest in DLL DllTest.dll." I tried import the dll (and lib) file in a Win32 console application and it works just fine. Here is my code: DllTest.h __declspec(dllexport) int fnDllTest(void); LibWrap.cs public class LibWrap { public LibWrap() { } [DllImport("DllTest.dll" )] public static extern int fnDllTest(); Quote: } And in my main cs-file int i = LibWrap.fnDllTest(); Can someone please tell me what I'm doing wrong? /Henke
Mon, 28 Mar 2005 15:39:32 GMT

Mattias Sj?gre #2 / 8	Problems with DllImport Henke, The function is probably exported with a mangled name. You can use Dumpbin /exports or Dependency Walker to see the actualy export name. Mattias === http://www.msjogren.net/dotnet/ Please reply only to the newsgroup.
Mon, 28 Mar 2005 16:16:49 GMT

Henk #3 / 8	Problems with DllImport Thanks Mattias, (man f?r inte skriva p? svenska h?r va?) it works fine. So this is the way to do it, looking the name up with Depends and add the entry point I mean? /Henke Quote: > Henke, > The function is probably exported with a mangled name. You can use > Dumpbin /exports or Dependency Walker to see the actualy export name. > Mattias > === > http://www.msjogren.net/dotnet/ > Please reply only to the newsgroup.
Mon, 28 Mar 2005 17:48:30 GMT

Greg Ewing [MVP #4 / 8	Problems with DllImport Henke, when you have a mangled name, yes, that's the way to do it. If you have control over the C dll you can force it not to mangle the name and save yourself the importing trouble. -- Greg Ewing [MVP] http://www.claritycon.com/ Quote: > Thanks Mattias, (man f?r inte skriva p? svenska h?r va?) > it works fine. > So this is the way to do it, looking the name up with Depends and add the > entry point I mean? > /Henke > > Henke, > > The function is probably exported with a mangled name. You can use > > Dumpbin /exports or Dependency Walker to see the actualy export name. > > Mattias > > === > > http://www.msjogren.net/dotnet/ > > Please reply only to the newsgroup.
Mon, 28 Mar 2005 21:48:37 GMT

Henk #5 / 8	Problems with DllImport Ok ,Greg I guess that's what the extern "C" does isn't it? /Henke Quote: > Henke, when you have a mangled name, yes, that's the way to do it. If you > have control over the C dll you can force it not to mangle the name and save > yourself the importing trouble. > -- > Greg Ewing [MVP] > http://www.claritycon.com/ > > Thanks Mattias, (man f?r inte skriva p? svenska h?r va?) now > > it works fine. > > So this is the way to do it, looking the name up with Depends and add the > > entry point I mean? > > /Henke > > > Henke, > > > The function is probably exported with a mangled name. You can use > > > Dumpbin /exports or Dependency Walker to see the actualy export name. > > > Mattias > > > === > > > http://www.msjogren.net/dotnet/ > > > Please reply only to the newsgroup.
Mon, 28 Mar 2005 22:58:26 GMT

Greg Ewing [MVP #6 / 8	Problems with DllImport Yep. Quote: > Ok ,Greg I guess that's what the extern "C" does isn't it? > /Henke > > Henke, when you have a mangled name, yes, that's the way to do it. If you > > have control over the C dll you can force it not to mangle the name and > save > > yourself the importing trouble. > > -- > > Greg Ewing [MVP] > > http://www.claritycon.com/ > > > Thanks Mattias, (man f?r inte skriva p? svenska h?r va?) > now > > > it works fine. > > > So this is the way to do it, looking the name up with Depends and add > the > > > entry point I mean? > > > /Henke > > > > Henke, > > > > The function is probably exported with a mangled name. You can use > > > > Dumpbin /exports or Dependency Walker to see the actualy export name. > > > > Mattias > > > > === > > > > http://www.msjogren.net/dotnet/ > > > > Please reply only to the newsgroup.
Mon, 28 Mar 2005 23:09:00 GMT

Mattias Sj?gre #7 / 8	Problems with DllImport Hej Henke, Quote: >Thanks Mattias, (man f?r inte skriva p? svenska h?r va?) Jod? det f?r man v?l om man vill, men det minskar ju l?sarkretsen drastiskt, och d?rmed chansen att f? ett bra svar. Quote: >So this is the way to do it, looking the name up with Depends and add the >entry point I mean? What Greg said. In addition to that, you should set the calling convention (with DllImport.CallingConvention) to cdecl to match the C code. It might not matter in this case since the function doesn't take any parameters, but for other functions it does. Mattias === http://www.msjogren.net/dotnet/ Please reply only to the newsgroup.
Tue, 29 Mar 2005 04:30:05 GMT

Henk #8 / 8	Problems with DllImport Thanks everybody, it works fine now. /Henke Quote: > Hej Henke, > >Thanks Mattias, (man f?r inte skriva p? svenska h?r va?) > Jod? det f?r man v?l om man vill, men det minskar ju l?sarkretsen > drastiskt, och d?rmed chansen att f? ett bra svar. > >So this is the way to do it, looking the name up with Depends and add the > >entry point I mean? > What Greg said. > In addition to that, you should set the calling convention (with > DllImport.CallingConvention) to cdecl to match the C code. It might > not matter in this case since the function doesn't take any > parameters, but for other functions it does. > Mattias > === > http://www.msjogren.net/dotnet/ > Please reply only to the newsgroup.
Tue, 29 Mar 2005 19:14:00 GMT

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