ATL / WTL / STL

3-Sep-02 19:32

Hi,

I have a COM server without idl/tlb files.
Can anybody tell how to get/generate a tlb from an exe which doesn't have an idl? I understand without idl , it is not possible to generate tlb. This server supports ATL but doesnot have its own idl file.

Stephane Rodriguez.3-Sep-02 19:40

Stephane Rodriguez.

3-Sep-02 19:40

- if you are using VC++7 and especially the latest ATL class wizards, you actually end up with interface declaration, class inheritance, and class implementation in the same non-idl file. That's what MS sees good as the new "Attribute-programming" style.
So you don't have a dedicated idl file, but it produces a standard tlb. No need to say I don't recommend this programming style sort of i-put-together-in-the-same-file, as it is a couple miles away from standard object modelling.

- by the way, if you need some idl format, you may just view and extract the content of the .tlb file using OleView (one of the tools with VC++).

And I swallow a small raisin.

Rais3-Sep-02 21:52

3-Sep-02 21:52

Actually, I have a COM Server ( an .Exe) with no tlb. I have to create its assembly for which it needs a tlb file. If I try to add a reference directly in .Net environment, it reports an error that it is not a valid COM Component.
But In VC++6.0, I can do the createinstance of this server. So that means it is a com component. and also in the registry the information available indicate that it is an OUTPROC Server.
In VC++ 6.0, I can directly use the CLSID of this COMServer and communicate with the interfaces that it wraps.
Do u know if we have any means in C# using which we can invoke this server?

Confused
Rais

Stephane Rodriguez.3-Sep-02 23:17

Stephane Rodriguez.

3-Sep-02 23:17

Get it clear : a COM server (.dll or .exe) comes with a .tlb, by definition. If not, no client application would be able to do successfully CoCreateInstance() on it.

What I guess is that in your case the .tlb file is embedded in the .exe file rather than separate, which is common (usually developers add a reference to the .tlb file generated at compile-time in the .rc resource file).

Have you tried to do "tlbimp <comservername.exe>" ? (from the MSDN doc, tlbimp does apply to any file with a tlb content inside).

MSDN doc.

There is no reason it doesn't work, and if you really need the .tlb file itself you may just as well use a resource file editor, and extract the type-library from it like you would with a picture.

Good luck!

And I swallow a small raisin.

Rais10-Sep-02 4:06

10-Sep-02 4:06

Hi,
I have tried this too. but tlbIml gives an error that it is not a valid com server, though in the registry it maintains all the information like its ProgId, CLSID, server version, etc....
This server has been created using Custom interfaces.
In VC++ , I can develop a client that launches this server on doing CoCreateInstance(...).

Confused!!!

Stephane Rodriguez.10-Sep-02 4:21

Stephane Rodriguez.

10-Sep-02 4:21

"Custom interfaces" is something you have invented.

You have COM interfaces, and that's all.

Post code snippets, at least SOME people MAY see and tell you;

MS quote (http://www.microsoft.com/ddk) : As of September 30, 2002, the Microsoft® Windows® 2000 DDK, the Microsoft Windows 98 DDK, and the Microsoft Windows NT® 4.0 DDK will no longer be available for purchase or download on this site. Support for development will ship at the same time as the Windows XP Service Pack 1 (SP1) release.

petrym9-Sep-02 7:03

petrym

9-Sep-02 7:03

Utilize the OLEVIEW tool. OLEVIEW has an Explorer-like browser.
1. Open Object Classes - All Objects and attempt to find your COM server which probably will be listed by Prog ID. This assumes that your COM server is registered of course.
2. Open Type Libraries - To attempt to view the type library. This assumes that there is a type library and the type lib is registered.

Note that both attempts may require some insightfull searching but visits to OLEVIEW typically prove to be fruitful.

Typically (but not always) type libraries are embedded in com server modules. VBers only need to add a reference to the typelibrary via a browser in there IDE. The would need to know the library name or the location of the exe,dll,exe,tlb file. C++ people may obtain type-lib info, including headers for compilation, by using the #import directive. See your local MSDN for more information.
Example
#import "C:\Program Files\JMPS\bin\JmpsFramework.tlb" raw_interfaces_only, raw_native_types, no_namespace, named_guids

Note that this will generate JmpsFramework.tlh in my build directory.

Note that some COM servers do not has tlbs - they use standard marshalling or may be a simple com server that does not intend to marshall such as a simple learning exercise.

beamsack

Rais10-Sep-02 4:00

10-Sep-02 4:00

The last line in your mail is of importance to me. I am using a COM server which does not have a tlb. Its using custom interfaces.

Can I use such a server using Automation clients like VB? If so, how?

In C#, in order to use a COM Component, the precondition is that it should have either a tlb or the server should carry this information within itself.
Only then, C# can create an assembly for this.

But since in my case I neither have a tlb, nor does the com server carries such information, I am unable to use it directly in C#.
Can you please look into it.

Thanks in advance

Rais

petrym10-Sep-02 9:00

petrym

10-Sep-02 9:00

Rais,
I would say that you must have a type library in order to use the COM server.
I believe standard marshalling is limited to C++. Header inforation is generated with the proxy/stub code.
VB would have no idea of the types you would wish to use.
I don't think automation will work without a tlb - you can test the possibility by creating a windows scripting host file and

Object myServer = _ <br />
CreateObject("MyProg.Identifier")<br />
myServer.MyMethodIHopeToCall

You must have a proxy/stub dll if you don't have a type library. It may even work because typically marshalling is not required for inproc COM servers, but the OS may place your server in a "delegate process". Therefore it is highly recommended that some type of type library or proxy stub dll exist.

STL map question

Chris Hambleton3-Sep-02 4:06

Chris Hambleton

3-Sep-02 4:06

Hi,

I have an STL string pair (using a map) and every value is unique (just like the keys are unique). Sometimes, I need to "flip" the keys and the values, so the keys would become the values and the values become the keys.

Is there a built-in function that would allow me to do this without having to create a new map and do this through a loop?

Thanks!

Joaquín M López Muñoz3-Sep-02 4:08

Joaquín M López Muñoz

3-Sep-02 4:08

Hi Chris,

I happen to be in the process of writing an STL-like bidirectional map, i.e. one for which you can lookup by key and by value. As my workload does not allow me to finish the thing, it'll be quite a while till I finally get to post it to CP. Nevertheless, if you're curious I can send to you what I have right now (it's already pretty functional, and beta testers are always great Smile | :)

).

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

John M. Drescher3-Sep-02 4:33

John M. Drescher

3-Sep-02 4:33

I've been looking for this for several years now. At one point I was going to write one myself, but I'm not a stl guru. Please email me this if you can at drescherjm@hotmail.com

Thanks,
John M. Drescher

Alexandru Savescu3-Sep-02 22:20

Alexandru Savescu

3-Sep-02 22:20

I am looking forward to such an article. In my applications I have been using two maps depending on what keys I needed. I am also intereseted in becoming your beta tester of course Smile | :)

.

Best regards,
Alexandru Savescu

CodeGuy3-Sep-02 4:23

CodeGuy

3-Sep-02 4:23

Chris Hambleton wrote:
Is there a built-in function that would allow me to do this without having to create a new map and do this through a loop?

Nope. A map is normally a red-black tree implementation, so by swapping a key-value pair, you've essentially invalidated the location of that node in the tree.

You can always remove the key-value pair first and then add the swapped values back in the tree. (More overhead, less memory usage of course.)

Brandon

Joao Vaz3-Sep-02 4:56

Joao Vaz

3-Sep-02 4:56

Humm, perhaps you could use a multimap, since insertion and remotion from the multimap doesn't invalidate the iterator(if I'm not mistaken here).

Cheers,
Joao Vaz
A Programming Language is a tool that has profound influence on our thinking habits -The late giant Edsger Dijkstra 1930 - 2002

And if your dream is to care for your family, to put food on the table, to provide them with an education and a good home, then maybe suffering through an endless, pointless, boring job will seem to have purpose. And you will realize how even a rock can change the world, simply by remaining obstinately stationary. -

Alexandru Savescu3-Sep-02 22:23

Alexandru Savescu

3-Sep-02 22:23

Well, until Joaquin bidirectional map comes out I suggest you use two maps and use one of them depending on what the keys are. This is what I have been doing. Smile | :)

Best regards,
Alexandru Savescu

Todd Smith5-Sep-02 13:18

Todd Smith

5-Sep-02 13:18

Why not store as the value both they value and the key

struct
{
int key;
int value;
} KeyValuePair;

std::map<int, KeyValuePair> mymap;

Then you can search through the map (although not as fast) by eithe the key or value.

Todd Smith

Jörgen Sigvardsson3-Oct-02 14:43

Jörgen Sigvardsson

3-Oct-02 14:43

You can already do a linear search for values. Why add the key to the data set?

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