C / C++ / MFC

3-Jun-02 7:49

IMO, this is the perfect place for COM. in one of my apps, i have a fairly simple plug-in framework set up where users just drop plug-in DLLs into a specific folder and then choose the ones they want from a list. the whole system is based on COleDispatchDriver (which is essentially a wrapper to a COM object - you tell it which COM object to load and then call methods on the COM object through the wrapper). i've seen articles here that do pretty much the same thing i do.

here's a rough outline of how i do it:

1. the app scans a folder for DLLs

2. based on the name of each DLL it finds, it tries this:

COleDispatchDriver d;
d.CreateDispatch(csDLLName+".MyInterface");

3. if that worked, the DLL is added to the list of useable plugin DLLs

4. the user gets to look at the list and choose the plugin(s) that he wants to use

5. when processing time comes, the app does the same CreateDispatch call for each DLL then calls the appropriate methods on the object.

-c

Cheap oil. It's worth it!

wanna do animation, please help

pnpfriend3-Jun-02 7:19

pnpfriend

3-Jun-02 7:19

hi all, i want to have an animation for my printing program. i want to display an animation while the file is printing.
i was reading about BitBlt but i don't really understand. I dont' want to draw programmatically i want to use my own animation gif file. but how am i suppose to post my gif file on the dialog. for bitmap pics i don't know how to create animation. from what i understood, i have to draw several pic and save with bmp extention. then load it, display it and replace it with next pic right. Smile | :)

to me sound so easy, but don't know what to do.
ok loading, i think i have to do: CBitmap::LoadBitmap("c:\mypic.bmp");
but how to display on certain place like buttons i can place anywhere on the dialog.
so no doubt that i can replace or do any animation since i can't even display one bmp on dialog i want.

do you have idea or any similar project?

Joaquín M López Muñoz3-Jun-02 7:59

3-Jun-02 7:59

Check Olek Bykov's excellent article Add GIF-animation to your MFC and ATL projects with the help of CPictureEx and CPictureExWnd. He provides out-of-the-box GIF animation capabilities.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

C^hris L^osinger3-Jun-02 8:59

3-Jun-02 8:59

yes, and then send $3500 to Unisys for a license to use GIF in your application.

-c

Cheap oil. It's worth it!

Joaquín M López Muñoz3-Jun-02 9:15

3-Jun-02 9:15

It is my understanding that non-profit non-commercial apps can freely use GIF technology, which may suit the guy's needs. I'm sure you already know this, but here's a link stating the fact: Unisys Clarifies Policy Regarding Patent Use in On-Line Service Offerings. The key paragraph reads:

Unisys does not require licensing, or fees to be paid, for non-commercial, non-profit GIF-based applications, including those for use on the on-line services.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

C^hris L^osinger3-Jun-02 10:55

3-Jun-02 10:55

from the Unisys LZW website:

In all cases, a written license agreement or statement signed by an authorized Unisys representative is required from Unisys for all use, sale or distribution of any software (including so-called "freeware") and/or hardware providing LZW conversion capability (for example, downloaded software used for creating/displaying GIF images). In certain cases, no license fees may be required, but this needs to be evidenced by a written agreement or written statement signed by an authorized Unisys representative.

-c

Cheap oil. It's worth it!

Joaquín M López Muñoz3-Jun-02 11:08

3-Jun-02 11:08

So it seems there's no escape at all. Chris, beware of your fancy smileys! They could lead you to jail.

Now seriously, why these guys from Unisys insist on this annoying issue? I'm sure the money they've been able to get from it these years is not worth the bad image they have gained.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

C^hris L^osinger3-Jun-02 11:10

3-Jun-02 11:10

no, there is no escape: pay the fee or use PNG.

but if i'm not mistaken, the patent expires next june/july.

-c

Cheap oil. It's worth it!

Paul M Watt3-Jun-02 14:56

Paul M Watt

3-Jun-02 14:56

I bought your IS image library a few years ago when it still had GIF support in it. Then I noticed when you removed GIF support, or at least started plastering notices about the license requirements for Unisys.

I was just wondering, did you get in trouble from them, or did you just decide to play it safe and remove GIF support?

Build a man a fire, and he will be warm for a day
Light a man on fire, and he will be warm for the rest of his life!

C^hris L^osinger3-Jun-02 15:33

3-Jun-02 15:33

a couple of years ago i noticed that some other toolkit developers (like the guys who make "gd") were starting to get into legal trouble, and some others (like the guys who do JpegLib and LibTiff) were getting out of GIF just in case. so i got out, too. i had the "non-LZW" form of GIF in there for a while, but i pulled it after i learned that Unisys wasn't agreeable to that, either.

-c

Cheap oil. It's worth it!

Paul M Watt3-Jun-02 16:09

Paul M Watt

3-Jun-02 16:09

Are you upset at Unisys? Because it seems that everytime that someone posts a question about GIFs your answers are a little harsh towards Unisys. I could care less either way about Unisys, but that is why I wondered if you had gotten into legal trouble with them.

Build a man a fire, and he will be warm for a day
Light a man on fire, and he will be warm for the rest of his life!

C^hris L^osinger3-Jun-02 16:11

3-Jun-02 16:11

yeah, i'm a little upset at them Smile | :)

but not for anything they did to me personally (yet)

-c

Cheap oil. It's worth it!

How to specify a custom baud rate with using MSCOMM ctrl?

Paul M Watt3-Jun-02 8:36

Paul M Watt

3-Jun-02 8:36

Why don't you search on the internet for a free software that will allow you to create AVI animations. That way you could create an animation from all of you bitmap images.

Then it is as easy as placing the animate control in the resource editor on a dialog and displaying the avi.

Build a man a fire, and he will be warm for a day
Light a man on fire, and he will be warm for the rest of his life!

3-Jun-02 7:11

can i specify baud rate 244 to operate the serial port with control Mscomm.ocx?
thx.

Re: How to specify a custom baud rate with using MSCOMM ctrl?

Ed Gadziemski3-Jun-02 10:56

Ed Gadziemski

3-Jun-02 10:56

No, only 110, 300, 600, 1200, etc.

Magnus H -> How do i get the IShellFOlder interface for the current folder in the loop?

redeemer3-Jun-02 6:50

redeemer

3-Jun-02 6:50

You said to use an IShellFolder pointer, but how do i get the IShellFolder interface for the folder that pNewId is pointing to in the

pFolder->Next(1, &pNewId, &pActual)

loop?

void AddFilesFromFolder(ITEMIDLIST *pIdl)
{
	if (pIdl)
	{
		IShellFolder *pBrowse = NULL;
		LPENUMIDLIST pFolder = NULL;
		LPMALLOC pMalloc = NULL;
		ITEMIDLIST *pNewId = NULL;
		STRRET strDispName;
		LVITEM lvItem;
		RECT rMain;
		RECT rAdd;
		char szCurrentFile[MAX_PATH+1+5];
		char szFolderPath[MAX_PATH+1];
		DWORD pActual = 0;
		DWORD dwAttrib;
		IShellFolder *CurrentFolder;
		HRESULT err;

		err = SHGetDesktopFolder (&CurrentFolder);

		if (err == NOERROR)
		{
			SHGetMalloc(&pMalloc);
			CurrentFolder->BindToObject(pIdl, NULL, IID_IShellFolder, (LPVOID*)&pBrowse);
			pBrowse->GetDisplayNameOf(pIdl, SHGDN_INFOLDER, &strDispName);
			err = pBrowse->EnumObjects(NULL, SHCONTF_FOLDERS | SHCONTF_NONFOLDERS | SHCONTF_INCLUDEHIDDEN, &pFolder);
			if (err == NOERROR)
			{
				SHGetPathFromIDList(pIdl, szFolderPath);

				lvItem.mask = LVIF_IMAGE | LVIF_TEXT;

				while (pFolder->Next(1, &pNewId, &pActual) != S_FALSE)
				{
					dwAttrib = SFGAO_FOLDER;
					pBrowse->GetAttributesOf(1, (LPCITEMIDLIST*)&pNewId, &dwAttrib);
						
					if (!(dwAttrib & SFGAO_FOLDER))
					{
						pBrowse->GetDisplayNameOf(pNewId, SHGDN_INFOLDER, &strDispName);
						PathCombine(gszPath, szFolderPath, strDispName.cStr);

						GetID3();
						FillInfo();
						ListAddItem();
					}

					if (dwAttrib & SFGAO_FOLDER)
					{
						pBrowse->GetDisplayNameOf(pNewId, SHGDN_INFOLDER, &strDispName);
						AddFilesFromFolder(pNewId);
					}
				}

				pMalloc->Free(pNewId);
				pMalloc->Release();
				gbFileOpen = true;
				pFolder->Release();
			}

			CurrentFolder->Release();
		}
	}
}

Thankyou

Strange compilation errors

moredip3-Jun-02 6:20

3-Jun-02 6:20

OK, I'm tearing my hair out over this one...

I've got a project with 2 .cpp files, both of which #include a .h file. All is well in the world. I add a second .h file (4dlist.h), for a template class. All is still well in the world. I then add a new .cpp file, with the single line #include "4DList.h", and now I start getting wierd compile errors.

So to recap, I have the following files:

CenFilter.cpp
CenWriter.cpp
foo.cpp
CenFilter.h
4DList.h

when foo is empty, everything works. when #includes 4DList.h I get errors.

here is the start of 4dlist.h:

template <class TYPE> class C4DList  
{
public:
	C4DList( UINT MaxSize = 1000 );
	virtual ~C4DList();
	C4DList( const C4DList &Copy );
	void operator=( const C4DList &op2 );

	UINT GetSize(){return m_ListSize;}

	void AddTail( TYPE *pData );
	TYPE *GetAt( UINT index );
	void RemoveAt( UINT index );
	void RemoveCurrentIt();//remove at the previous iterator value;
	void RemoveAll();
	void DeleteAllData();

	void ItStart();
	TYPE *ItNext();
...
...
...

So CenFilter.h has #include 4dlist.h and is fine.

but if foo.cpp has the single line it throws up:

Compiling...
foo.cpp
C:\Pete\Capture\CenFilter\CenReadFilter\4dlist.h(12) : error C2629: unexpected 'class C4DList<type> ('
C:\Pete\Capture\CenFilter\CenReadFilter\4dlist.h(51) : see reference to class template instantiation 'C4DList<type>' being compiled
C:\Pete\Capture\CenFilter\CenReadFilter\4dlist.h(12) : error C2238: unexpected token(s) preceding ';'
C:\Pete\Capture\CenFilter\CenReadFilter\4dlist.h(51) : see reference to class template instantiation 'C4DList<type>' being compiled
C:\Pete\Capture\CenFilter\CenReadFilter\4dlist.h(17) : error C2146: syntax error : missing ';' before identifier 'GetSize'
...
...

Now I REALLY don't get this. Oh, BTW, this isn't a standard appwizard project, it's adapted from an MSDN sample project.

I hope someone can help!

Pete

moredip3-Jun-02 6:29

3-Jun-02 6:29

oops, I forgot about the <> thing Blush | :O

the first line of that code snippet should've been

template < class TYPE > class C4DList

sorry!

Joaquín M López Muñoz3-Jun-02 6:29

3-Jun-02 6:29

Not sure if this is your problem, but you have to include <windows.h> for UINT and other such types to be defined.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

moredip3-Jun-02 6:34

3-Jun-02 6:34

I don't think that's it, coz my other .cpp and .h files have UINT's in them

Thanks anyway

Joaquín M López Muñoz3-Jun-02 6:35

3-Jun-02 6:35

Give it a try, it's safer than guessing.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

moredip3-Jun-02 6:44

3-Jun-02 6:44

OK, I think that was the best advice I've had in a few months Smile | :)

Next time I won't make any dumb assumptions. Or rather, I'll try not too.

I guess that the other .cpp files were including something else which eventually included windows.h

Thanks a lot Joaquin, I was starting to lose hope back there Big Grin | :-D

Pete

Joaquín M López Muñoz3-Jun-02 6:47