C / C++ / MFC

Shog⁹7-Aug-02 10:25

Shog⁹

7-Aug-02 10:25

zeki wrote:
but other good books are which?

Here's one for ya! Smile | :)

---

Shog⁹
If I could sleep forever, I could forget about everything...

zeki yugnak7-Aug-02 13:44

zeki yugnak

7-Aug-02 13:44

sorry...

may english is not good..

Cry | :((

Shog⁹7-Aug-02 13:51

Shog⁹

7-Aug-02 13:51

Hey, no worries - don't take it as a slam, it really *is* a good book! Smile | :)

---

Shog⁹
If I could sleep forever, I could forget about everything...

Tomasz Sowinski7-Aug-02 10:17

Tomasz Sowinski

7-Aug-02 10:17

Soliant wrote:
I thought MFC was an abstraction away from WinAPI calls.

Yes, but (fortunately) the abstraction is just a pretty thin wrapper on API. I'd say API knowledge is big advantage.

Tomasz Sowinski -- http://www.shooltz.com

What is "scratch" and why can everything be made from it?

retrieving a bmp from acess

Michael P Butler7-Aug-02 22:16

Michael P Butler

7-Aug-02 22:16

You don't need to know it. For my first year back in 1993, I pretty much managed without knowing too much API. Over the years though, you soon realise it's nice to know the API too - especially when hitting the limits of MFC's scope.

Michael Smile | :)

Time flies like an arrow. Fruit flies like a banana

VC++ SAX integration

act_x7-Aug-02 7:23

act_x

7-Aug-02 7:23

I am trying to use SAX in my Dialog Based Application .

I have a SAXHandler class that derives from the DocumentHandler that SAX provides.

My Dialog Class has a SAXHandler object and a SaxParser Object .

Cry | :((

I am having problems when I link the project.
Errors I get are of the type

SAXdev.obj : error LNK2001: unresolved external symbol "__declspec(dllimport) public: virtual __thiscall SAXParser::~SAXParser(void)" (__imp_??1SAXParser@@UAE@XZ)

SAXdevDlg.obj : error LNK2001: unresolved external symbol "__declspec(dllimport) public: virtual __thiscall SAXParser::~SAXParser(void)" (__imp_??1SAXParser@@UAE@XZ)

SAXdevDlg.obj : error LNK2001: unresolved external symbol "__declspec(dllimport) public: __thiscall SAXParser::SAXParser(class XMLValidator * const)" (__imp_??0SAXParser@@QAE@QAVXMLValidator@@@Z)

What is the correct method to add the files ?

Please help

Re: VC++ SAX integration

C^hris L^osinger7-Aug-02 7:39

C^hris L^osinger

7-Aug-02 7:39

did you implement a constructor and a destructor for your SAXParser object ?

-c

WWJD? JWRTFM.
found on /.

image effects!

Re: VC++ SAX integration

act_x7-Aug-02 7:51

act_x

7-Aug-02 7:51

I did not . The SAXParser class is in a .hpp class and is as follows :
class PARSERS_EXPORT SAXParser :

public Parser
, public XMLDocumentHandler
, public XMLErrorReporter
, public XMLEntityHandler
, public DocTypeHandler
{
public :
// -----------------------------------------------------------------------
// Class types
// -----------------------------------------------------------------------
enum ValSchemes
{
Val_Never
, Val_Always
, Val_Auto
};

// -----------------------------------------------------------------------
// Constructors and Destructor
// -----------------------------------------------------------------------

/** @name Constructors and Destructor */
//@{
/** Constructor with an instance of validator class to use for
* validation.
* @param valToAdopt Pointer to the validator instance to use. The
* parser is responsible for freeing the memory.
*/
SAXParser(XMLValidator* const valToAdopt = 0);

/**
* Destructor
*/
~SAXParser();
//@}

It was said that in SAX one needs to only implement the Handler class that derives from Documenthandler

then we need to invoke

parser.SetDocumentHandler(& handlerobject)
parser.Parse();

The sample code I referred from a Text book did not have any initialization for the parser object .

Please help

Re: VC++ SAX integration

C^hris L^osinger7-Aug-02 8:08

C^hris L^osinger

7-Aug-02 8:08

you can't declare a constructor (or destructor) and not implement it.

at the very least make them do nothing:

~SAXParser()
{
}

SAXParser::SAXParser(XMLValidator* const valToAdopt = 0)
{
}

WWJD? JWRTFM.
found on /.

image effects!

ns7-Aug-02 6:56

7-Aug-02 6:56

I manually put in .bmps in my access database (its a valid thing to do). The images are of type Ole Object. I am trying to retrieve them in the following:

memcpy(pImage, (char *) (_bstr_t) m_pRecordset->Fields->GetItem ("pImage")->Value.bVal,
    ImgSize);

where pImage is allocated big enough . So evidently I am not casting the value right. I do need a char* to show in my ImageBoxes(thats what they take), but my code crashes exactly at the line above. I havent figured out how to inspect and see if the image is valid etc, any ideas as to how I could do that?
Thanks for any help you can give me.

ns
Confused | :confused:

C^hris L^osinger7-Aug-02 7:20

C^hris L^osinger

7-Aug-02 7:20

cast pImage to a BITMAPFILEHEADER * and look at the members. they should reflect various aspects of your image.
-c

WWJD? JWRTFM.
found on /.

image effects!

Ranjan Banerji7-Aug-02 7:31

Ranjan Banerji

7-Aug-02 7:31

It may be coiming in as a pointer to bval, i.e.,
m_pRecordset->Fields->GetItem ("pImage")->Value.pbVal

Not sure. But may be

Joel Lucsy7-Aug-02 8:36

Joel Lucsy

7-Aug-02 8:36

While I've not had to retrieve bmp's from Access, I have had to insert .bmp's into it. I'll provide a few links to get you started.
Storing "Paint Brush" images in a Access DB[^]

Embedding OLE Objects Into an Access Database [^]

I should write a note to remind me to write an article about this stuff. Big Grin | :-D

I seem to be too Sleepy | :zzz:

tho.

Joel Lucsy (jjlucsy@ameritech.net)

serial communication and bluetooth

ns7-Aug-02 9:23

7-Aug-02 9:23

Thanks. I also http://www.codeproject.com/database/usingblob.asp found this which I think will do, still reading it.

Thanks for all the input,
ns

Frank S.7-Aug-02 6:28

Frank S.

7-Aug-02 6:28

Hi,

I have a problem ... i have written a program that communicates with IR - serial communication with my pocket pc and my mobile phone. I used for that a part of the little tty-codesample, which you can find in the help of the Visual C++ tools of Microsoft. I changed there some communication options and it worked. But now i want to use that serial communication with bluetooth. Could that work? And one thing is, that i don't know exactly, how i have to setup the settings for that communication (serial). My current setup is like that:

PortDCB.BaudRate = CBR_9600; PortDCB.fBinary = TRUE;
PortDCB.fParity = TRUE;
PortDCB.fOutxCtsFlow = FALSE; PortDCB.fOutxDsrFlow = FALSE;
PortDCB.fDtrControl = DTR_CONTROL_ENABLE; PortDCB.fDsrSensitivity = FALSE;
PortDCB.fTXContinueOnXoff = TRUE;
PortDCB.fOutX = FALSE;
PortDCB.fInX = FALSE;
PortDCB.fErrorChar = FALSE;
PortDCB.fNull = FALSE;
PortDCB.fRtsControl = RTS_CONTROL_ENABLE;
PortDCB.fAbortOnError = FALSE;
PortDCB.ByteSize = 8;
PortDCB.Parity = NOPARITY;
PortDCB.StopBits = ONESTOPBIT;

and:

CommTimeouts.ReadIntervalTimeout = MAXDWORD;
CommTimeouts.ReadTotalTimeoutMultiplier = 0;
CommTimeouts.ReadTotalTimeoutConstant = 0;
CommTimeouts.WriteTotalTimeoutMultiplier = 10;
CommTimeouts.WriteTotalTimeoutConstant = 1000;

That worked for the IR-communication, but not for bluetooth.

Would be very fine, if someone knows a trick to setup for bluetooth communication !!!

Greetings,

Frank

_____ easySMS for pocket PC _____
www.Siedler-Net.de/WinCE/easySMS/

Re: serial communication and bluetooth

Frank S.8-Aug-02 23:38

Frank S.

8-Aug-02 23:38

Hi,

i have found something on http://msdn.microsoft.com/.../ceconvirtualcomportsample.asp

it seems, that it's possible to setup a Virtual COM Port for bluetooth, but does anyone know, if that is possible with the Embedded Visual Tools 3.0, or must i install some new apps for that? Or has anyone that code-sample?

Greetings,

Frank

_____ easySMS for pocket PC _____
www.Siedler-Net.de/WinCE/easySMS/

blob data question

ns7-Aug-02 5:22

7-Aug-02 5:22

Hi,
Can anyone point me to some information on how to add and retrieve blob data from an Access database, using Visual C++ 6 (not .Net)

Thanks,
ns

Nish Nishant7-Aug-02 5:26

Nish Nishant

7-Aug-02 5:26

Does Access have a blob data type? I am not sure. There's something called memo but even that is a limited size field I think

Nish

Author of the romantic comedy

Summer Love and Some more Cricket [New Win]

Review by Shog⁹
Click here for review[NW]

ns7-Aug-02 5:34

7-Aug-02 5:34

I dont know. All I know is that we want to store pictures in a database ( ACCESS), and then retrieve them and show them. I dont know if we could just input them as char*. The embeded nulls in the binary data might be a problem. I really am very new at this, so any help is greatly appreciated!

Thanks,
ns

Tomasz Sowinski7-Aug-02 5:48

Tomasz Sowinski

7-Aug-02 5:48

Nishant S wrote:
Does Access have a blob data type? I am not sure. There's something called memo but even that is a limited size field I think

Access has both memos and blobs.

Tomasz Sowinski -- http://www.shooltz.com

What is "scratch" and why can everything be made from it?

Ranjan Banerji7-Aug-02 6:33

Ranjan Banerji

7-Aug-02 6:33

Not sure how to do it using ADO but in principal it should be the same as ODBC.

In ODBC the data will come through as a :

SQL_C_BINARY | SQLCHAR * | unsigned char *

You can load the data into a void pointer and then write it to a file. I did this around 5 years ago. Selected BLOBs of image files from Oracle and wrote it to the drive.

Just cannot recall the exact syntax. But essentially you will get the data in some binary form. Check the ADO documentation. It may come through as a BSTR*.

Hope this helps.