I am wondering if it's possible to convert an executable to a dll.
I wrote a windows application that is called by a 16bit application. I was thinking that it might be easier to just make the windows app a dll and then just call the winmain in the windows app from the 16bit app. Is it possible to do this ?

: I am wondering if it's possible to convert an executable to a dll.
: I wrote a windows application that is called by a 16bit application. I was thinking that it might be easier to just make the windows app a dll and then just call the winmain in the windows app from the 16bit app. Is it possible to do this ?
:

Write little .def file and tell linker to use it with /DEF:file.def option. def-file defines entrypoints to DLL like this:

LIBRARY yourlibraryname
EXPORTS
WinMain

Oh, and write DllMain-entrypoint somewhere...

: : I am wondering if it's possible to convert an executable to a dll.
: : I wrote a windows application that is called by a 16bit application. I was thinking that it might be easier to just make the windows app a dll and then just call the winmain in the windows app from the 16bit app. Is it possible to do this ?
: :
:
: Write little .def file and tell linker to use it with /DEF:file.def option. def-file defines entrypoints to DLL like this:
:
: LIBRARY yourlibraryname
: EXPORTS
: WinMain
:
: Oh, and write DllMain-entrypoint somewhere...
:
Much appreciated, thanks. But i have a stupid question. Where do i use the DLLMain entry point ? In the WinMain file ?

: : : I am wondering if it's possible to convert an executable to a dll.
: : : I wrote a windows application that is called by a 16bit application. I was thinking that it might be easier to just make the windows app a dll and then just call the winmain in the windows app from the 16bit app. Is it possible to do this ?
: : :
: :
: : Write little .def file and tell linker to use it with /DEF:file.def option. def-file defines entrypoints to DLL like this:
: :
: : LIBRARY yourlibraryname
: : EXPORTS
: : WinMain
: :
: : Oh, and write DllMain-entrypoint somewhere...
: :
: Much appreciated, thanks. But i have a stupid question. Where do i use the DLLMain entry point ? In the WinMain file ?
:
:

It doesn't really matter if you do all the initialization stuff in WinMain. Stick DllMain-stub where ever you like, best place would propably be after DllMain. Just make that DllMain returns TRUE in all cases.

: : : : I am wondering if it's possible to convert an executable to a dll.
: : : : I wrote a windows application that is called by a 16bit application. I was thinking that it might be easier to just make the windows app a dll and then just call the winmain in the windows app from the 16bit app. Is it possible to do this ?
: : : :
: : :
: : : Write little .def file and tell linker to use it with /DEF:file.def option. def-file defines entrypoints to DLL like this:
: : :
: : : LIBRARY yourlibraryname
: : : EXPORTS
: : : WinMain
: : :
: : : Oh, and write DllMain-entrypoint somewhere...
: : :
: : Much appreciated, thanks. But i have a stupid question. Where do i use the DLLMain entry point ? In the WinMain file ?
: :
: :
:
: It doesn't really matter if you do all the initialization stuff in WinMain. Stick DllMain-stub where ever you like, best place would propably be after DllMain. Just make that DllMain returns TRUE in all cases.
:

Thanks again.

: : I am wondering if it's possible to convert an executable to a dll.
: : I wrote a windows application that is called by a 16bit application. I was thinking that it might be easier to just make the windows app a dll and then just call the winmain in the windows app from the 16bit app. Is it possible to do this ?
: :
:
: Write little .def file and tell linker to use it with /DEF:file.def option. def-file defines entrypoints to DLL like this:
:
: LIBRARY yourlibraryname
: EXPORTS
: WinMain
:
: Oh, and write DllMain-entrypoint somewhere...
One more question. What about the rc file, can i still use it or do i need to do anything with it ?
:

I finally was able to get the dll working, but when i compile the executable that calls the dll i get the following warning message.

warning C4113: 'int (__stdcall *)()' differs in parameter lists from 'int (__stdcall *)(struct HINSTANCE__ *,struct HINSTANCE__ *,char *,int )'

The dll project has an entry point as well as the winmain function. I also declare the winmain in the calling program as int WINAPI WinMain(....);
then in the calling program i load the library that contains the exported function WinMain with an alias CMyFunc.
In the calling function i declare a function pointer as follows:
int (WINAPI * fptr)(HINSTANCE hInstance, HINSTANCE hPrevInst,LPSTR lpCmdLine,int nShowCmd);
I use that function pointer to call GetProcAddress(hinst,"CMyFunc").
That's the line that gives me the warning message. Otherwise the program works fine, it calls the DLL and it's great. Thanks, but i am concerned about the warning because i think i am doing everything correctly. Any ideas anyone ?
Below is the code i am using in the calling program.
hinstLib = LoadLibrary("mirpdll.dll");
if( hinstLib != NULL)
{
fptr = GetProcAddress(hinstLib,"CMyFunc");
if (fRunTimeLinkSuccess = (fptr != NULL))
(fptr(hInst,NULL,str,0)) ;

// Free the DLL module.

fFreeResult = FreeLibrary(hinstLib);

}

: I finally was able to get the dll working, but when i compile the executable that calls the dll i get the following warning message.
:
: warning C4113: 'int (__stdcall *)()' differs in parameter lists from 'int (__stdcall *)(struct HINSTANCE__ *,struct HINSTANCE__ *,char *,int )'
:
: The dll project has an entry point as well as the winmain function. I also declare the winmain in the calling program as int WINAPI WinMain(....);
: then in the calling program i load the library that contains the exported function WinMain with an alias CMyFunc.
: In the calling function i declare a function pointer as follows:
: int (WINAPI * fptr)(HINSTANCE hInstance, HINSTANCE hPrevInst,LPSTR lpCmdLine,int nShowCmd);
: I use that function pointer to call GetProcAddress(hinst,"CMyFunc").
: That's the line that gives me the warning message. Otherwise the program works fine, it calls the DLL and it's great. Thanks, but i am concerned about the warning because i think i am doing everything correctly. Any ideas anyone ?
: Below is the code i am using in the calling program.
: hinstLib = LoadLibrary("mirpdll.dll");
: if( hinstLib != NULL)
: {
: fptr = GetProcAddress(hinstLib,"CMyFunc");
: if (fRunTimeLinkSuccess = (fptr != NULL))
: (fptr(hInst,NULL,str,0)) ;
:
: // Free the DLL module.
:
: fFreeResult = FreeLibrary(hinstLib);
:
: }
:

Answer is simple :)

GetProcAddress returns pointer of type void (__stdcall *)(void). You need to cast it to correct form. In your case like this:

fptr = (int (WINAPI *)(HINSTANCE,HINSTANCE,LPSTR,int))GetProcAddress(...)