ATL / WTL / STL Discussion Boards

lpvoid27-Feb-03 11:07

27-Feb-03 11:07

I've gotten in to using the STL, and as you guys said, I know prefer it over MFC's containers (and other functions). My question is, I've got this vector of values and I am trying to use a function that requires a pointer to an array of values (the ones in the vector). Is there a way to easily do this or do I need to create an array, copy the vector's contents into it, use the function, and then copy the values back into the vector?

Thanks in advance for your help.

Re: Vectors and arrays

valikac27-Feb-03 13:08

valikac

27-Feb-03 13:08

One solution is to pass an address of an element in the contain.

vecSome::iterator iData = data.begin();
somefunction(&iData);

somefunction[&data[0]);

Kuphryn

Re: Vectors and arrays

lpvoid28-Feb-03 2:35

lpvoid

28-Feb-03 2:35

Kuphryn,

Thank you for your suggestion, the second one worked. I suddenly like the STL containers even more.

When I tried the first
somefunction(&iData);
... it wouldn't accept it, saying something along the lines of could not convert vector< ... > to const blah ...

But the second way
somefunction(&iData[0]);
... worked perfectly.

Try doing that with CArray!

Re: Vectors and arrays

Tim Smith28-Feb-03 3:22

Tim Smith

28-Feb-03 3:22

Easy,

somefunction (Data .GetData ());

Tim Smith

I'm going to patent thought. I have yet to see any prior art.

Re: Vectors and arrays

lpvoid28-Feb-03 9:48

lpvoid

28-Feb-03 9:48

Hmm... I'll have to try that one.

Thanks

Re: Vectors and arrays

Tim Smith28-Feb-03 3:24

Tim Smith

28-Feb-03 3:24

This works too.

somefunction (data .begin ());

Tim Smith

I'm going to patent thought. I have yet to see any prior art.

Re: Vectors and arrays

Joaquín M López Muñoz1-Mar-03 8:23

Joaquín M López Muñoz

1-Mar-03 8:23

This just works out of luck. std::vector iterators need not be pointers. &data[0] is the way to go.

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Re: Vectors and arrays

Tim Smith3-Mar-03 2:19

Tim Smith

3-Mar-03 2:19

Yup, you are right. I guess it is one of those things you see so often you forget it is .... WRONG. Smile | :)

Tim Smith

I'm going to patent thought. I have yet to see any prior art.

Bug in IStream::Write()?

Mainul27-Feb-03 5:56

Mainul

27-Feb-03 5:56

I am working with a project which handles large compound files. Now I face a problem with IStream::Write().

IStream::Write()retuns an error STG_E_DOCFILETOOLARGE (Error:"The compound file is too large for the current implementation").

I am trying to write in a compound file created with 512 Byte sectors (Info MSDN see below). The current file size is about 300 MByte and the number of streams are about 100000 ! The error occurs only with Win 2000 SP3 and XP SP1. In Win NT 4.0 SP6a it works !!! When I create the file with 4096 Byte sectors in StgCreateStorageEx, IStream::Write works for Win 2000 and XP too. Now my question: Is this a bug?

Info from MSDN Library:

The compound file implementation can be configured to use 512 or 4096 byte sectors, as defined in the STGOPTIONS structure. File size limits: 512: 2 gigabytes (GB) 4096: Up to file system limits Number of elements in a file: 512: Unlimited, but performance may degrade if elements number in the thousands 4096: Unlimited

Mainul Hossain
Germany

Mainul Hossain

Icon in System Tray

rajeev26-Feb-03 23:34

rajeev

26-Feb-03 23:34

I am working on an ATL service. My problem is that I want to display an Icon whenever the service starts. Also on the click of icon it should display a menu from where I can stop the service.
I tried using NOTIFYICON data structure but it requires parameters such as handle to the parent window and to the icon. How do I get handles to the window as there is no UI for an ATL service

Re: Icon in System Tray

valikac27-Feb-03 7:16

valikac

27-Feb-03 7:16

Interesting problem. One solution is to design an interface (GUI) for the service and have it communicate with the user.

Kuphryn

Re: Icon in System Tray

Anonymous27-Feb-03 17:07

Anonymous

27-Feb-03 17:07

Can it not be done without a UI?? Frown | :(

Re: Icon in System Tray

Todd Smith28-Feb-03 8:31

Todd Smith

28-Feb-03 8:31

Create a seprate trayicon.exe application that can communicate with your service.

Todd Smith

Re: Description string from event log backup file

geo_m25-Feb-03 23:36

geo_m

25-Feb-03 23:36

Maybe I am wrong, but I remember than when I some time ago did something with event log, I have first register a message before use the eventlog - the message format was something like
messageID=XYZ; "Some error occured in function %s"
This message definition is stored somewhere in registry I guess...

Then when I wanted to write such an error to eventlog I only refer to the definition and add the string to be completed (say "main").
ReportError( XYZ; "main" );

in eventlog viewer it appears to be:
"Some error occured in function main"

I think that this is because it can save a quite big amount of space in the evt file, because they can store only the "main" string in each entry instead of the whole message.

I don't think, that this will help you a much, but at least you know reason why it doesn't work for you now.

more info

AlexO26-Feb-03 2:33

AlexO

26-Feb-03 2:33

What is the error? What flags do you use for FormatMessage? Is it possible that not all the messages came from the same message DLL? How do you deal with parameters?

Implementing Interface

SuDG24-Feb-03 12:22

SuDG

24-Feb-03 12:22

I am implementing interface to handle event . I am stuck in defining _ATL_FUNC_INFO .

Sample of my code is

/////////////////////////////////////////////////////////////////////////////
class CCTIHPPCHelper;

#define EVENT_SOURCE_CTI 1
#define CTIHPPCEventDIID HiPathProCenterLibrary:IID__IMediaManagerEvents
typedef IDispEventSimpleImpl<event_source_cti, cctihppchelper,="" &ctihppceventdiid=""> SCTIHPPCEventImpl;

and in .tlh file i have

_IMediaManagerEvents : IDispatch
{
//
// Wrapper methods for error-handling
//

// Methods:
HRESULT EventOccurred (
struct IMediaEvent * MediaEvent );
};

My problem is how should i define _ATL_FUNC_INFO as parameter in "EventOccurred" is a struct type and what should be my BEGIN_SINK_MAP definition.

Is there any other way for implementing interface.

Thanks

Re: Implementing Interface

geo_m26-Feb-03 0:00

geo_m

26-Feb-03 0:00

Hi,

I didn't get your question completelly, but the general approach how to handle the events is very simple in ATL.
Assume you have class CWantEvents and you want to receive the event you described.

Then you have to define the sink map as follows:

<br />
BEGIN_SINK_MAP(CWantEvents)<br />
   SINK_ENTRY_EX(0, __uuidof(_IMediaManagerEvents), /*dispid =*/ 1, OnEventOccurred)<br />
END_SINK_MAP()<br />
<br />
// Event Handlers<br />
void __stdcall OnEventOccurred( IMediaEvent* ipMediaEvent )<br />
{<br />
// here is the event processing<br />
};<br />

Then when you attach to the event source (using DispEventAdvise), you have to be able to receive such an event.

Hope this helps.
Ya, and note - the member marked in my sample as dispid might be different for you (depend on dispID of the real event method you want to receive)

ActiveX Event Sinking

MoMad24-Feb-03 12:16

MoMad

24-Feb-03 12:16

Ok, if I got this right, event sinking is when you listen for COM events?

I am trying to listen for Internet Explorer events (idc_print, idc_printpreview) from an ActiveX control within internet explorer. I was wondering if someone can help me out or point me in the right direction.

MoMad the NoMad

Re: ActiveX Event Sinking

Jörgen Sigvardsson3-Mar-03 9:45

Jörgen Sigvardsson

3-Mar-03 9:45

idc_print? idc_printpreview? Take a look at the DWebBrowserEvents2 dispinterface. Those are the events you can sink. (At least what's been published by Microsoft. Smile | :)

)

--
tlhIngan maH! Heghlu'meH QaQ jajvam!

ATL7 probs with enum in interface

Rainer Mangold23-Feb-03 11:17

Rainer Mangold

23-Feb-03 11:17

In ATL6 (VS6) creating an interface like this

interface ICtrl1 : IDispatch<br />
{<br />
    typedef enum {Diedel, Doedel, Doing} DUMMY;<br />
    [id(1), helpstring("method Foo")] HRESULT Foo([in]DUMMY Dummy);<br />
};

in Foo.idl the file was properly compiled by MIDL.

However doing the same in ATL7 in the controls headerfile

__interface ICtrl1 : public IDispatch<br />
{<br />
	typedef enum {Diedel, Doedel, Doing} DUMMY;<br />
	[id(1), helpstring("method Foo")] HRESULT Foo([in] DUMMY Dummy);<br />
};

results in an error MIDL2025 : syntax error : expecting a type specification near "DUMMY".

I have no idea what I am doing wrong here Confused | :confused:

Rainer

Re: ATL7 probs with enum in interface

AlexO24-Feb-03 2:39

AlexO

24-Feb-03 2:39

I am little bit rusty in IDL, but I do not think enum inside of interface is valid syntax (granted that VC6 compiled that). Compile in VC6, use OleView on the resulting tlb, my guess is that older MIDL just silently moved that typedef out of interface definition during compilation.

I guess this should be a simple one...

User 988522-Feb-03 5:13

User 9885

22-Feb-03 5:13

char buf[128];
sprintf("%-10s%0.02lf\r\n", "Test", 1.567);

I want to replace it with a stream

std::stringstream mystream;
mystream << "Test" << 1.567 << std::endl;

Now my question: how do I format the stream like I did with printf?

Thanks

My article on a reference-counted smart pointer that supports polymorphic objects and raw pointers

modified 29-Aug-18 21:01pm.

Re: I guess this should be a simple one...

Pavel Klocek23-Feb-03 1:35

Pavel Klocek

23-Feb-03 1:35

Use stream manipulators. See this[^].

Pavel
Sonork 100.15206

How to send mail in ATL?

shanksprasad20-Feb-03 23:07

shanksprasad

20-Feb-03 23:07

Hi,
i am new to ATL.i want to send a simple mail with an attachment using the ATL DLL.Can anyone help me out of this problem?If possible pls paste the code/syntax.
Thanks for all in advance

Re: How to send mail in ATL?

Giles20-Feb-03 23:31

Giles

20-Feb-03 23:31

Your going to need a library that supports SMTP, or implement your own version from the RFC. There are a few libs on this site, but you need to make sure that they don't make use of MFC, unless your happy to link to MFC in your ATL projects, but it will bloat them.

Here is an Win API version, but its very basic

http://www.codeproject.com/internet/zsmtp.asp[^]

This next article has a very good implementation that I can vouch for, but says its MFC based. On the whole its not, it just makes use of CString, which is now avaliable in ATL without binding to MFC. PJ points out that it does not use the MFC socket classes as they are message loop based which is no good if you need to write an NT service.

http://www.codeproject.com/internet/csmtpconn.asp[^]

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