importing a .net dll into VC6 - C / C++ / MFC Discussion Boards

Re: Please Help! What would cause Member Variable problem?

David Crow12-Apr-06 10:17

12-Apr-06 10:17

Charlie Curtis wrote:
...my .ncb, .aps, and .clw files got corrupted. I deleted them and reopened my project rebuilt the class wizard and all is well.

Yes, that is a common problem, too.

"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain

"There is no death, only a change of worlds." - Native American Proverb

Problem when Change number of arguments of MFC activeX control's exposed method

Michael Tang12-Apr-06 8:48

Michael Tang

12-Apr-06 8:48

Please forgive my bad English first.

I changed the number of arguments of one of exposed methods of an old MFC activeX control. Then I just can't call it any more either in VB or ActiveX Control Test Container.

Here are the steps:
1).
I built a MFC activeX control with one of its exposed functions requiring 1 arguments. I registered the control and built a test VB application and it was OK.

2).
Then I changed that function to having 2 arguments and built the control again. And I also registered it again.

3).
The I changed calling code in the test VB application accordingly. But it just failed to call the function by remind me "Invalid number of arguments".

Any help will be greatly appreciated!

Re: Problem when Change number of arguments of MFC activeX control's exposed method

Michael Tang12-Apr-06 9:42

Michael Tang

12-Apr-06 9:42

I think I found an IMPORTANT message. It's a warning when I compile the new MFC control in VC 6.0:

: warning C4002: too many actual parameters for macro 'DISP_FUNCTION'

I think this the very reason of the problem. But I have manually changed the method declarations in all the places.

Why is there this compiling WARNING?

Re: Problem when Change number of arguments of MFC activeX control's exposed method

prasad_som12-Apr-06 19:41

prasad_som

12-Apr-06 19:41

Michael Tang wrote:
: warning C4002: too many actual parameters for macro 'DISP_FUNCTION'

It says you have added one additional parameter in macro defn.
Make your macro defn look like one following

DISP_FUNCTION(mycorntrolclass, "MyMethod", MyMethod, VT_EMPTY/*return type*/, VTS_PI4 VTS_PI4/* nos of params should be space separated, dont use comma inbetn*/)

make sure you activex builds without any warning.
Add its reference to your client program again.

Re: Problem when Change number of arguments of MFC activeX control's exposed method

Michael Tang13-Apr-06 4:05

Michael Tang

13-Apr-06 4:05

prasad_som, A thousand thanks to you!
You just hit it, Now it's solved by killing the redundant comma.
I had checked the macro difinition I changed for so many times, but I just omitted the comma. Smile | :)

Re: Problem when Change number of arguments of MFC activeX control's exposed method

prasad_som17-Apr-06 2:09

prasad_som

17-Apr-06 2:09

my pleasure Smile | :)

call stack not getting created

inamulev12-Apr-06 8:29

inamulev

12-Apr-06 8:29

We have added the stackwalker.cpp program to our application to generate callstack report.
This is working fine in the development environment and the stacktrace is getting created.
But when we copy the executable to a separate windows system where there is no development environment like visual studio installed, the stacktrace is not getting created. Is this error
due to some missing dll files in the isolated system where we dont have visual studio installed
or do we have to make some changes in the way we are compiling and building the application.
Any suggestions would be of immense help.

importing a .net dll into VC6

Waldermort12-Apr-06 8:23

Waldermort

12-Apr-06 8:23

I have searching for hours now trying to figure this one out. I have a .NET dll, not my own, which I wish to import into my project. From what I have read, and I may be wrong, I need to import it as a COM object. So I have tried

#import "net.dll"

which results in:
fatal error C1083: Cannot open type library file: 'net.dll': Error loading type library/DLL.

This leads me to believe that the dll has no type library. When I have included my own VB dlls using the same method, I have no problems, the .tli and .tlb files are generated.

Is there another way to do this?

Re: importing a .net dll into VC6

oshah12-Apr-06 13:16

oshah

12-Apr-06 13:16

You haven't yet created the Type library for the .NET DLL. To create a type library, you need to make use of the regasm.exe tool.

regasm.exe net.dll

Also make sure you have set the [ComVisible(true)] attribute

Re: importing a .net dll into VC6

Michael Dunn12-Apr-06 15:24

Michael Dunn

12-Apr-06 15:24

You can't do .net programming with VC6.
The best you can do is make the DLL have a CCW (COM callable wrapper) and then VC6 will see it as just another COM server.

--Mike--
Visual C++ MVP Cool | :cool:

LINKS~! Ericahist | NEW!! PimpFish | CP SearchBar v3.0 | C++ Forum FAQ

Re: importing a .net dll into VC6

Waldermort12-Apr-06 19:59

Waldermort

12-Apr-06 19:59

Michael Dunn wrote:
You can't do .net programming with VC6.

does that mean I can't code VB in VC either :p

The dll I am trying to use is from a sourceforge project which has been coded in C#. I do not have the means to compile from source therefore I have to download the precompiled version. So I suppose my question is, to make this work in my project, would I have to change anything within the .net dll?

Compile Error with __stdcall

gmhanna12-Apr-06 8:00

gmhanna

12-Apr-06 8:00

Hi,

I'm trying to convert a C application written for Watcom's C/C++ compiler to Visual C/C++ and I'm getting a compile error on the file that contains some of the prototypes, yet I do not understand what went wrong and how it's different.

Here's the line from the prototype file:

LONG EXPENTRY   fnwpMainWindow(<br />
                 HWND hwnd, UINT msg, WPARAM mp1, LPARAM mp2 );

EXPENTRY is defined as an _export APIENTRY, APIENTRY is defined as a WINAPI and WINAPI is defined as __stdcall.

The error I'm receiving is error C2143: syntax error : missing '{' before '__stdcall'

Any idea's why this is happening?

Thank you,

Glenn

Re: Compile Error with __stdcall

David Crow12-Apr-06 8:22

David Crow

12-Apr-06 8:22

gmhanna wrote:
The error I'm receiving is error C2143: syntax error : missing '{' before '__stdcall'

So what is above the fnwpMainWindow() prototype?

What if you changed it to:

long _export __stdcall fnwpMainWindow(HWND hwnd, UINT msg, WPARAM mp1, LPARAM mp2 );

"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain

"There is no death, only a change of worlds." - Native American Proverb

Re: Compile Error with __stdcall

gmhanna12-Apr-06 8:58

gmhanna

12-Apr-06 8:58

Hi David,

Yes, fnwpMainWindow is the prototype. I changed it to what you have and I receive the same error. Frown | :(

Converting this does not seem to be a simple task...

Glenn

Re: Compile Error with __stdcall

David Crow12-Apr-06 9:04

David Crow

12-Apr-06 9:04

gmhanna wrote:
Yes, fnwpMainWindow is the prototype.

I know that. I asked what was above it? The error said that a '{' was missing before __stdcall. So look at the code prior to __stdcall to see if there is a missing '{'.

"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain

"There is no death, only a change of worlds." - Native American Proverb

Re: Compile Error with __stdcall

gmhanna12-Apr-06 10:04

gmhanna

12-Apr-06 10:04

Hi David,

After some experimentation I determined it has something to do with the _export, not exactly sure what but from what I'm reading I should be doing something like this:

long __declspec(dllexport) __stdcall Fred( );

Is this the same thing as:

long _export __stdcall SomeName( );?? From what I read, _export is really for 16bit and __declspec is for 32bit.

Your thoughts?

Glenn

Re: Compile Error with __stdcall

David Crow12-Apr-06 10:15

David Crow

12-Apr-06 10:15

gmhanna wrote:
From what I read, _export is really for 16bit and __declspec is for 32bit.

You are correct?

"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain

"There is no death, only a change of worlds." - Native American Proverb

using *.h files in a new MFC app :)

Mahhouraaaaaa12-Apr-06 7:14

Mahhouraaaaaa

12-Apr-06 7:14

i've created some Cpp and h files in the console application
i want to use them in the MFC ..
but i have to include them in some dialog's cpp files ...
it shows me this error Smile | :)

<br />
...frmmodsupp.cpp(7) : fatal error C1083: Cannot open include file: 'CMot.h': No such file or directory

Re: using *.h files in a new MFC app :)

Bob Flynn12-Apr-06 7:27

Bob Flynn

12-Apr-06 7:27

It looks like you do not have CMot.h is the project directory or in the search path.

Re: using *.h files in a new MFC app :)

Eytukan12-Apr-06 22:36

Eytukan

12-Apr-06 22:36

I guess you forgot to use #include "Cmot.h" in your CPP file.

<marquee scrollamount="1" scrolldelay="1" direction="up" height="10" step="1">--[V]--

Need Help Starting an APP.

Cougarxr712-Apr-06 7:01

Cougarxr7

12-Apr-06 7:01

Hello,
This is my first post here and I hope someone can help me.
I'm new to C++ and really know very little, however I am a fast learner.
Here's what I'm trying to do.
Write an app. that will copy 2 files and rename them.
Then the the app will start an exe.(the exe cannot be run in dos mode!)
Then the app will start a timer that will run the exe for 30 to 60 minutes.]
Then the app will shut down the exe.
I do not have any code started for this.
I trully do not know where to start.
I do have visual C++ 6.0.
Any and all help will be greatly appreciated!
Thanks!

Re: Need Help Starting an APP.

Mahhouraaaaaa12-Apr-06 7:11

Mahhouraaaaaa

12-Apr-06 7:11

try to look first at the MFC AppWizards..
how to use buttons ...
how to start an exe ... ( from the internet and tutorials )
how to create timers ...
Wink | ;)

ok man !!

Re: Need Help Starting an APP.

David Crow12-Apr-06 7:33

David Crow

12-Apr-06 7:33

Cougarxr7 wrote:
I trully do not know where to start.
I do have visual C++ 6.0.

Select New from the File menu. Click the Projects tab. Select Win32 Console Application.

Cougarxr7 wrote:
Write an app. that will copy 2 files...

Use CopyFile().

Cougarxr7 wrote:
...and rename them.

Use rename().

Cougarxr7 wrote:
Then the the app will start an exe.

See here.

"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain

"There is no death, only a change of worlds." - Native American Proverb

Re: Need Help Starting an APP.

Greg Barnes12-Apr-06 8:15

Greg Barnes

12-Apr-06 8:15

Check these out...

Win32 API tutorial

CPlusPlus tutorial

Buy this:

THE Book!

Hope that helps. I don't know much but I'm more than happy to do
what I can. Smile | :)

Re: Need Help Starting an APP.

David Crow12-Apr-06 8:20

David Crow

12-Apr-06 8:20

Gr8Shag wrote:
Hope that helps.

Probably not for Cougarxr7.

"Let us be thankful for the fools. But for them the rest of us could not succeed." - Mark Twain

"There is no death, only a change of worlds." - Native American Proverb

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