1. Dynamically load a class out of a DLL and create an instance of it - CSharp/C#
2. how to load classes from DLL
I used an utility called Excelsior JET to convert Java class files into a dll My question is, how do i use a class in the DLL in vc++? I am used to calling functions from DLLs using loadLibrary() but class i have never used. Help me. Harkeman
3. singleton in a DLL loaded class
I seem to have a problem unloading MFC extension DLL's with VC2002 (it may
also exist on VC2002).
The following code is the DLLMain for a DLL which is loaded/unloaded
dynamically from a VC7 MFC application.
===================================
#include "stdafx.h"
#include <afxdllx.h>
...
static AFX_EXTENSION_MODULE ETVFDDLL = { NULL, NULL };
extern "C" int APIENTRY
DllMain(HINSTANCE hInstance, DWORD dwReason, LPVOID lpReserved)
{
if (dwReason == DLL_PROCESS_ATTACH)
{
AfxInitExtensionModule(ETVFDDLL, hInstance);
new CDynLinkLibrary(ETVFDDLL);
}
else if (dwReason==DLL_PROCESS_DETACH)
{
AfxTermExtensionModule(ETVFDDLL, hInstance);
}
}
When the termination is called, the application loses the classlist causing
subsequent failures in locating the CRuntimeClasses of various objects.
I believe this problem is caused by failing to set the AFX_MODULE_STATE
m_pClassInit to its m_classList head before AfxInitExtensionModule is run.
The problem seems corrected by inserting:
ExtRawDllMain(hInstance, dwReason, lpReserved);
prior to the AfxInitExtensionModule call.
There seems to be a disconnect between the runtime library routine
_DllMainCRTStartup and the mfc afxdllx.h file.
ExtRawDllMain never gets called from _DllMainCRTStartup because the pointer
_pRawDllMain is NULL.
Please note that afxdllx.h (on VC7) initializes _pAtlChainRawDllMain to
point to ExtRawDllMain.
On VC6, the pointer initialization was to _pRawDllMain.
Thanks,
Bill
5. Question: Dynamic DLL loading / Class export
6. Return Class instance from dynamically loaded DLL?
I use dynamically loaded dll's a lot in my programs. The one thing i cannot
figure out how do is too to sucessfully pass the address of a class instance
created within the dynamically loaded dll. I step thru the code and confirm
that the class is correctly created in the dll, but as soon as it steps out
of the dll i loose the address. For example:
hLib = LoadLibrary("RasterIO.dll");
ImageIOClass *ImageIO = (ImageIOClass
*)GetProcAddress((HINSTANCE)hLib, "_GetImageIOClass");
if (ImageIO != NULL)
{
TRasterIO *IO;
ImageIO(IO, ...); // instance created with new in dll.
if (IO)
{
// do something with IO
....
}
else
{
return;
}
delete IO;
}
UnloadPackage(hLib);
That is the basic idea of what i am trying to do. If i statically link the
dll i can get an instance of the class no problem. I suppose this is all
something to do with the way dlls handle and share memory - something i
obviously do not understand!
Peter
8. Having problem with class decaration when Building a class librara
Have you referrenced the other library? If so, have you added a using statement to import the appropriate namespace from the other library? What does the error message say when you build? "tony" wrote: > Hello! > > I try to build a class library but I run into some problems. > > In the code for this class library there are some rows that have this kind > of look > public bool IsBottomMixValid(MeltPracDataGmix.BottomBlowing mix, int > maxBottomFlow) > > As you can see here we have a class named MeltPracDataGmix that exist in the > code for the project > that build the actual exe file. So the class definition does not exist in > this project for this class library. > > My qustion is what is the solution to this kind of problem. > > I assume if this was C++ it would be enough to include the class declaration > which is the header file. > > But in C# we don't have any header files. So how do I do here? > > //Tony > > > >