Safe Array and COM + - C / C++ / MFC Discussion Boards

Joaquín M López Muñoz13-Feb-02 3:55

13-Feb-02 3:55

First of all, please tick in the "Display this message as-is (no HTML)" checkbox. Your code comes as garbage since '<' characters mess up with HTML.
Your problem lies in the piece of sentence investorsList[j-1] > temp. I guess you're trying to compare Investors somehow for sorting purposes. For this to work, you have to define the corresponding comparison operator:

bool operator >(const Investor& i1,const Investor& i2)
{
  // return true if i1 is "greater" than i2, false otherwise
}

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

thank you

13-Feb-02 4:01

thanks joaquin

Retrieve program location

radix13-Feb-02 3:21

radix

13-Feb-02 3:21

Hi!

Is there an easy way how an MFC program can retrieve its own location in means of drive and folders? I've been searching thru the whole MSDN Library for a couple of times and got none the wiser. Right now I use GetCommandLine() and search for the first two quotes, as they wrap the program's name and location. But I think this is quite risky, so I'd appreciate your help.

Thanks,

Martin

Re: Retrieve program location

Joaquín M López Muñoz13-Feb-02 3:29

Joaquín M López Muñoz

13-Feb-02 3:29

GetModuleFileName(NULL).

Joaquín M López Muñoz
Telefónica, Investigación y Desarrollo

Re: Retrieve program location

radix13-Feb-02 15:06

radix

13-Feb-02 15:06

Thanks a lot!

Martin

Build project

Kishore Ratna P13-Feb-02 3:10

Kishore Ratna P

13-Feb-02 3:10

When I am trying to build my project in VC++ 6.0, Windows 95,with some files updated, all of my files in that project are also compiling.(I have tried build selection also). can any one suggest what i have to do for compiling only those
files.
Thanks for reply....
Kishore

Kishore
miel, senate
bangalore

Re: Build project

Nish Nishant13-Feb-02 3:15

Nish Nishant

13-Feb-02 3:15

I think the file creation dates dont match the system date. Maybe you developed them on a system with a futuristic wrong date.

Nish

Nish was here, now Nish has gone;
He left his soul, to turn you on;
Those who knew Nish, knew him well;
Those who didn't, can go to hell.

I like to Jig | [Dance]

on the Code Project

Sonork ID 100.9786 voidmain
www.busterboy.org

Safe Array and COM +

13-Feb-02 3:13

I have written a function that given an Interface GUID, class name, method name, and parameters; it will execute the method. Now I need to get the return values for byref parameters.

I call invoke as follows

hr = pdisp->Invoke(dispid,IID_NULL,LOCALE_SYSTEM_DEFAULT,DISPATCH_METHOD,&dispparams,pval,&excep,&uArgErr);

Now I want to return the values of dispparams.rgvarg out through a safe array.

Can anyone help??
Confused | :confused:

-------------------------------
STDMETHODIMP CClassWrapper::RunMethod(BSTR strIIDImplemented, BSTR strClassName, BSTR strFunctionName, INT intArgCount, VARIANT * ArgType, VARIANT * ArgVals, VARIANT * ArgValsRet, VARIANT *pval)
{

HRESULT hr = S_OK; // Result code
IID ImplemInteface; // Interface to implement
CLSID clsid; // CLSID of ActiveX object.
LPDISPATCH pdisp = NULL; // IDispatch of ActiveX object.
DISPID dispid; //dispatch id of function

//get the Interface Pointer from Giud passed in
hr = IIDFromString(strIIDImplemented,&ImplemInteface);

if (FAILED(hr))
{

return hr;
}

// Retrieve CLSID from the ProgID that the user specified.
hr = CLSIDFromProgID(strClassName, &clsid);
if (FAILED(hr))
{

return hr;
}

//init com
hr = OleInitialize(NULL);

// create object
hr = CoCreateInstance(clsid, NULL, CLSCTX_SERVER, ImplemInteface, reinterpret_cast<void**>(&pdisp) );
if (FAILED(hr))
{
CoUninitialize();
return hr;
}

//get id for function
hr = pdisp->GetIDsOfNames(IID_NULL,&strFunctionName,1, LOCALE_SYSTEM_DEFAULT,&dispid);
if (FAILED(hr))
{
CoUninitialize();
return hr;
}

SAFEARRAY *sa, *saTypes, *saReturn, *saDisp ;
sa = (*ArgVals->pparray);
saTypes = (*ArgType->pparray);

if(pval) ::VariantClear(pval);

DISPPARAMS dispparams = {NULL,NULL,0,0};

if (intArgCount > 0 )
{
dispparams.cArgs = intArgCount;
dispparams.cNamedArgs = 0;
dispparams.rgdispidNamedArgs = NULL;
dispparams.rgvarg = new VARIANTARG[intArgCount];

VARIANT* rgElems, *rgElemsTypes, *rgElemRets;
SafeArrayAccessData(sa, (LPVOID*)&rgElems);
SafeArrayAccessData(saTypes, (LPVOID*)&rgElemsTypes);

for(int i=intArgCount-1;i>=0;i--)
{
switch (rgElemsTypes[i].intVal)
{

case VT_UI1:
dispparams.rgvarg[i].vt = VT_UI1;
dispparams.rgvarg[i].bVal = rgElems[i].bVal;
break;
case VT_I2:
dispparams.rgvarg[i].vt = VT_I2;
dispparams.rgvarg[i].iVal = rgElems[i].iVal;
break;
case VT_I4:
dispparams.rgvarg[i].vt = VT_I4;
dispparams.rgvarg[i].lVal = rgElems[i].lVal;
break;
case VT_R4:
dispparams.rgvarg[i].vt = VT_R4;
dispparams.rgvarg[i].fltVal = rgElems[i].fltVal;
break;
case VT_BOOL:
dispparams.rgvarg[i].vt = VT_BOOL;
dispparams.rgvarg[i].boolVal = rgElems[i].boolVal;
break;
case VT_CY:
dispparams.rgvarg[i].vt = VT_CY;
dispparams.rgvarg[i].cyVal = rgElems[i].cyVal;
break;
case VT_BSTR:
dispparams.rgvarg[i].vt = VT_BSTR;
dispparams.rgvarg[i].bstrVal = rgElems[i].bstrVal;
break;
case VT_UNKNOWN:
dispparams.rgvarg[i].vt = VT_UNKNOWN;
dispparams.rgvarg[i].punkVal = rgElems[i].punkVal;
break;
case VT_DISPATCH:
dispparams.rgvarg[i].vt = VT_DISPATCH;
dispparams.rgvarg[i].pdispVal = rgElems[i].pdispVal;
break;
case VT_ARRAY:
dispparams.rgvarg[i].vt = VT_ARRAY;
dispparams.rgvarg[i].parray = rgElems[i].parray;
break;
case VT_VARIANT:
dispparams.rgvarg[i].vt = VT_VARIANT;
dispparams.rgvarg[i] = rgElems[i];
break;
default:
break;
}

}

SafeArrayUnaccessData(sa);
SafeArrayUnaccessData(saTypes);

EXCEPINFO excep;
UINT uArgErr;

hr = pdisp->Invoke(dispid,IID_NULL,LOCALE_SYSTEM_DEFAULT,DISPATCH_METHOD,&dispparams,pval,&excep,&uArgErr);

}
else
{
EXCEPINFO excep;
UINT uArgErr;

hr = pdisp->Invoke(dispid,IID_NULL,LOCALE_SYSTEM_DEFAULT,DISPATCH_METHOD,&dispparams,pval,&excep,&uArgErr);

}

//release com
CoUninitialize();

return hr;

}

Re: Safe Array and COM +

Matt Philmon13-Feb-02 15:47

Matt Philmon

13-Feb-02 15:47

I think you lost me just a little. dispparams are the parameters you're passing in. The resulting data from calling the function is in pval, not dispparams unless I'm missing something? I can help with a little more detail and a couple examples. While I try to NEVER have to go through this like you are (I love smart pointers) I've certainly had to do it enough times.

Matt

Interupts...????

alex.barylski13-Feb-02 2:58

alex.barylski

13-Feb-02 2:58

I just stumbled onto this now...way cool...but under windows 95 you acn actually use interupts...?

This means low level tinkering...how much cooler can you get. However the MSDN states Window95 ONLY

Does this exclude Windows 98...? I don't see how it could...maybe the docs are really old, cuz...who uses INT anymore..?

Interupts in dos allowed crazy programming, do they apply as well in windows...?

How though...When you call INT does it actually switch the processor outta protected mode do it's thing and switch back...? I thought device drivers replaced interupts..

Anybody care to elaborate...?

"An expert is someone who has made all the mistakes in his or her field" - Niels Bohr

Re: Interupts...????

Nish Nishant13-Feb-02 3:11

Nish Nishant

13-Feb-02 3:11

You can use DeviceIoControl to do a lot of stuff that you used to use interupts in DOS for. I am not sure of the details. Some time ago I wrote an app [for Win 95/98/ME] that made INT 13h calls to read/write floppy disk sectors. I can't remember the details. I remember meaning then to write an article for CP but then forgot about it. I remember something about a vxd that worked in 98/85/ME.

For NT/2000 I had to write separate functions using CreateFile and opeing the floppy as a file. But that didnt let me access the 80th [81st one]track and we had to make some changes to the 98/ME/95 version to use the 79th [80th] track.

Nish

Nish was here, now Nish has gone;
He left his soul, to turn you on;
Those who knew Nish, knew him well;
Those who didn't, can go to hell.

I like to Jig | [Dance]

on the Code Project

Sonork ID 100.9786 voidmain
www.busterboy.org

Re: Interupts...????

alex.barylski13-Feb-02 4:12

alex.barylski

13-Feb-02 4:12

So you can actually write to the boot sector of the harddisk...? Thats sweet...i'm totally gonna have to read up that...I've been thinking for sometime now...that like a
Windows Assembler would be super cool...

Just think...click n drag Visual Basic IDE but coding in assembly...I personally think it sounds cool.

I gotta learn mroe about VxD's though...I seen a really interesting book Windows 98 system programming...MSPRESS every read it...?

In any case...i'm pretty hapy even though it'll be sometime before i have time to dick around with those functions.

"An expert is someone who has made all the mistakes in his or her field" - Niels Bohr

Font size?

JCY13-Feb-02 2:52

JCY

13-Feb-02 2:52

Hi.. just wanna ask a simple question..
given the LOGFONT data structure.. how would I know the FONT SIZE of the TEXT displayed..'cuz seems like lfHeight and lfWidth need to be transformed or processed to get the FONT SIZE?
Thanks in advance!!!

Re: Font size?

alex.barylski13-Feb-02 2:59

alex.barylski

13-Feb-02 2:59

Initialize the structure with a call to GetTextMetrics(ex)

"An expert is someone who has made all the mistakes in his or her field" - Niels Bohr

Re: Font size?

Ravi Bhavnani13-Feb-02 3:00

Ravi Bhavnani

13-Feb-02 3:00

The relation between lfHeight and the font's point size is:

lfHeight = -MulDiv(PointSize, GetDeviceCaps(hDC, LOGPIXELSY), 72);

/ravi

"There is always one more bug..."
http://www.ravib.com
ravib@ravib.com

Renaming a file

13-Feb-02 1:58

How do I programmatically rename a file?

Cd

Re: Renaming a file

alex.barylski13-Feb-02 2:03

alex.barylski

13-Feb-02 2:03

CFile::Rename would probably do wonders

Cheers

"An expert is someone who has made all the mistakes in his or her field" - Niels Bohr

Re: Renaming a file

Mazdak13-Feb-02 2:13

Mazdak

13-Feb-02 2:13

Check:
rename, _wrename

Mazy

Don't Marry a Person You Can Live With...
Marry Someone You Can Not Live Without

Re: Renaming a file

Nish Nishant13-Feb-02 2:18

Nish Nishant

13-Feb-02 2:18

You can use the MoveFile API call.

Nish

Nish was here, now Nish has gone;
He left his soul, to turn you on;
Those who knew Nish, knew him well;
Those who didn't, can go to hell.

I like to Jig | [Dance]

on the Code Project

Sonork ID 100.9786 voidmain
www.busterboy.org

Command Line and GUI

13-Feb-02 1:46

I have a requirement by which my application should run in two modes

1) As a back ground process taking inputs as a command line arguments
2) As a stand alone GUI application with dialogs etc stuff.

So how to go about it?
It should be developed in VC++ on NT

1) Is it wise to develop the product as two applications? One application will be providing only GUI functionality and
the other doing the core job?

or

2) Develop a single application which runs with GUI if there is no command line argument and works in
background if data is fed as command line arguments.

Can any one share some experiences?

Re: Command Line and GUI

alex.barylski13-Feb-02 2:02

alex.barylski

13-Feb-02 2:02

I would suggest parsing the commandline in a single application. Well designed classes would allow code reuse, minus the GUI code.

I've never written an app that required console/plus windows if thats your desired effect. However I have developed an app that parsed the Cmdline and decided whether to show windows or just go abouts doing it business.

I'd go with one module, not two...just my opinion though. Smile | :)

"An expert is someone who has made all the mistakes in his or her field" - Niels Bohr

Re: Command Line and GUI

Josh Knox (disabled)13-Feb-02 6:43

Josh Knox (disabled)

13-Feb-02 6:43

I recently had to do something like this.

I wrote a console app that would take command line options and could be run on its own.

I then made a dialog app that would generate the command line string and use a call to CreateProcess to run the console application.

Doing it this way simplified the process cuz I only had to write the guts of the program once for the console app. The GUI was just a front-end app to convert user input to a command line string yet would produce the same output.

Josh Knox
that-guy.net

"Before you criticize someone, walk a mile in their shoes. That way, when you criticize them, you're a mile away, and you have their shoes." - author unknown

::OpenPrinter() - Help !!!

13-Feb-02 1:09

Hi folks!

I just start to go crazy. I had to convert an Word-Document in an AFP-Document for an HOST-System. I can´t use the MFC and I also had to use an IBM Printer Driver for the convertion .doc to .afp.

I wanna use the OpenPrinter()- and SetPrinter()-methods because the user should not see an printing dialog and the IBM printing driver is not the standard printer.

My OpenPrinter()-Call always fails, the return value is zero. When I check the LastError-Code it´s 87 (The parameter is incorrect.).

Is there anybody out there who can help me? What is my mistake? Thanks a lot for any help or suggestion!

cu,
Lars Confused | :confused:

Re: ::OpenPrinter() - Help !!!

Shog⁹13-Feb-02 7:16

Shog⁹

13-Feb-02 7:16

What name are you passing in?
Where did you get the name? Did you hard code it or enum installed printers?
Does this work when you do it manually; i.e. open the document in word, select print from the file menu, select the printer, print?

farewell goodnight last one out turn out the lights

Smashing Pumpkins, Tales of a Scorched Earth

Re: ::OpenPrinter() - Help !!!

13-Feb-02 21:36

Hi, Shog9!

I tried every printer name I could find ("friendly" name, shared name, etc). For testing I coded the printer name hard, maybe I should try EnumPrinters() (got this tip just a few minutes before...).
Can´t proof it manually ´cause the printer driver is "installed" at the "FILE"-port, ´cause I don´t wanna print "real". I just wanna use this driver to convert a .doc-File to an .afp-File. After convertion, I´ll transport the afp-File to a HOST system.

Thanks for trying helping me!!!

cu,
Lars

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