Using COM Object Invalid Pointer Error - C / C++ / MFC Discussion Boards

Jeff Archer27-Nov-09 7:08

27-Nov-09 7:08

Yes, and thanks. But I'm still kind of looking for a nice table like they have for the 32 floats. Don't want to make the table myself because I'm not the expert. Just want to be able to refer to the expert.

Re: Question about double #INF and #NAN

Richard MacCutchan27-Nov-09 7:17

Richard MacCutchan

27-Nov-09 7:17

If you scroll up the page the nice table is there on the screen.
[edit]sorry I note those are not doubles, but I'm sure a bit of simple extrapolation will do it[/edit]

Re: Question about double #INF and #NAN

Jeff Archer27-Nov-09 7:51

Jeff Archer

27-Nov-09 7:51

Thanks.

I was hoping to find such a table for double. Really, just a supporting documentation. I believe the values in my original question were correct.

Re: Question about double #INF and #NAN

CPallini27-Nov-09 7:23

CPallini

27-Nov-09 7:23

If you're looking for NAN it may be either

0xFFFM
or
0x7FFM

i.e. sign bit may be either 0 or 1 and 52 bit-wide mantissa M != 0 is implementation-dependent (may carry additional info).

Of course this is going on my arrogant assumptions...
Smile | :)

If the Lord God Almighty had consulted me before embarking upon the Creation, I would have recommended something simpler.
-- Alfonso the Wise, 13th Century King of Castile.

This is going on my arrogant assumptions. You may have a superb reason why I'm completely wrong.
-- Iain Clarke

[My articles]

Re: Question about double #INF and #NAN

Jeff Archer27-Nov-09 7:50

Jeff Archer

27-Nov-09 7:50

The values in my original question are correct. (I believe) Just looking for supporting documentation.

Thanks again for the time and thought you have put into this.

Re: Question about double #INF and #NAN

CPallini27-Nov-09 8:03

CPallini

27-Nov-09 8:03

Well, while your values represent correctly NAN values, they (according to that Wikipedia page) don't cover all the possibilities.
Smile | :)

Re: Question about double #INF and #NAN [modified]

Jeff Archer27-Nov-09 8:39

Jeff Archer

27-Nov-09 8:39

Sorry, I guess I didn't present that very well.

NAN is an exponent of 0x7FF with a non-zero mantissa.
INF is an exponent of 0x7FF with a zero mantissa.

Here are the actual fuctions I am using...

bool IsInf (double d)
{
      const INT64 iInf = 0x7FF0000000000000;

      if ((*(INT64*)&d & 0x7FFFFFFFFFFFFFFF) == iInf)
            return true;
      return false;
}

bool IsNan (double d)
{
      INT64 exp = *(INT64*)&d & 0x7FF0000000000000;
      INT64 mantissa = *(INT64*)&d & 0x000FFFFFFFFFFFFF;
      if (exp == 0x7FF0000000000000 && mantissa != 0)
            return true;
      return false;
}

modified on Friday, November 27, 2009 3:04 PM

Using COM Object Invalid Pointer Error

Ash_VCPP27-Nov-09 1:18

Ash_VCPP

27-Nov-09 1:18

Hi All,

I have created COM component(dll) and created one client to use it, Please finnd the code of client:-

HRESULT hr = CoInitialize(0);
		//CoCreateInstance(
		SCRIPTOBJLib::IScriptObjPtr sobj;
		//sobj->QueryInterface(IId_,void* &vp);
		//HRESULT hRes = CComObject<CScriptObj>::CreateInstance(&sobj);
		//CreateInstance(NULL,IID_IUnknown,(void*)&vp);
		//HRESULT hres = sobj.CreateInstance  ( __uuidof(SCRIPTOBJLib::IScriptObj) );

		//HRESULT hres = sobj.CreateInstance("ScriptObj 1.0 Type Library");
		//at this point i am getting the error
		sobj->SetLanguage((unsigned short *)"VBScript");
		CoUninitialize();

Please give me some solutions coz i tried every possible way.

Thanks A Ton
Ash_VCPP
walking over water is just knowing where the stones are.....

Re: Using COM Object Invalid Pointer Error

Richard MacCutchan27-Nov-09 2:11

Richard MacCutchan

27-Nov-09 2:11

Ash_VCPP wrote:
SCRIPTOBJLib::IScriptObjPtr sobj;
//sobj->QueryInterface(IId_,void* &vp);

You have not initialized sobj to an instance of anything.

Re: Using COM Object Invalid Pointer Error

Ash_VCPP27-Nov-09 2:18

Ash_VCPP

27-Nov-09 2:18

Yes but i tried many ways as you can see it in commented code to initialize it, but getting error HRESULT value= -2147221164.

can you please suggest me how can i initialize com object with example regards of my code.

Thanks A Ton
Ash_VCPP
walking over water is just knowing where the stones are.....

Re: Using COM Object Invalid Pointer Error

Richard MacCutchan27-Nov-09 2:22

Richard MacCutchan

27-Nov-09 2:22

Ash_VCPP wrote:
can you please suggest me how can i initialize com object with example regards of my code.

You have the following declaration in your code

SCRIPTOBJLib::IScriptObjPtr sobj;

So you need to initialize sobj to an instance of SCRIPTOBJLib::IScriptObjPtr. The documentation should explain how to do this. If you do not understand instances of classes I suggest you refer back to he C++ documentation for guidance.

Re: Using COM Object Invalid Pointer Error

Ash_VCPP27-Nov-09 2:33

Ash_VCPP

27-Nov-09 2:33

But i think initializing COM object is different from normal class, and if not then can you please show me few lines of code to initialize COM object, Because i am wondering with google since last two dyas.

Thanks A Ton
Ash_VCPP
walking over water is just knowing where the stones are.....

Re: Using COM Object Invalid Pointer Error

Richard MacCutchan27-Nov-09 2:59

Richard MacCutchan

27-Nov-09 2:59

As I said in my previous entry you need to use the documentation; I have not used the library that you are working with. Perhaps some time reading through some of the COM articles here on CodeProject would be time well spent.

Re: Using COM Object Invalid Pointer Error

Jeff Archer27-Nov-09 5:13

Jeff Archer

27-Nov-09 5:13

The HRESULT you have indicated is 0x80040152 - Could not find the key in the registry

Sounds like the COM object you are trying to use is not correctly installed or you are not using the correct ProgID.

Try using a CLASSID for your CreateInstance.

Re: Using COM Object Invalid Pointer Error

Ash_VCPP29-Nov-09 21:39

Ash_VCPP

29-Nov-09 21:39

Hi Jeff,

I think the helpstring which we pass in idl file will be the progID please let me know if i am wrong,So here i am using below line to get the class id:-

HRESULT hres1 = CLSIDFromProgID(OLESTR("ScriptObj 1.0 Type Library"), &clsid);

But still i am getting the same error.I have seen registry entry for my dll and its there with the string i mentioned in above function.Please provide me some suggestions on this.

Thanks A Ton
Ash_VCPP
walking over water is just knowing where the stones are.....

Re: Using COM Object Invalid Pointer Error

Jeff Archer2-Dec-09 2:10

Jeff Archer

2-Dec-09 2:10

If the return from this is 0x80040152 it is not being found in the registry. I suggest try the class id just as the next step of investigation. This HRESULT is either the client not registered correctly or using the incorrect ProdID.

c++ reading a large text file with fstream

nuttynibbles26-Nov-09 22:24

nuttynibbles

26-Nov-09 22:24

hi,

im reading a large text file using fstream. below is my code:

<br />
char logfile[10] = "log.txt";<br />
		char data[100];<br />
	  <br />
	  fstream open_logviewer(logfile, ios::in);<br />
    <br />
	  while(!open_logviewer.eof()){<br />
			open_logviewer.getline(data,100);<br />
      cout << data << endl;<br />
    }  <br />
	  open_logviewer.close();<br />

because the file has so many lines of data, when the program is executed, it will run through the data quickly to the end of line. this makes it hard for the user to read the data.

how can i give user an option to probably press enter to view let say next 10 lines?

Re: c++ reading a large text file with fstream

T210226-Nov-09 22:36

T2102

26-Nov-09 22:36

require user input using C++'s cin or C's scanf

Re: c++ reading a large text file with fstream

nuttynibbles26-Nov-09 22:50

nuttynibbles

26-Nov-09 22:50

hi,
erm what you're referring is read user input and print the particular line?

if it is, i'm actually looking to print the whole chunk but allowing user to able to read every 10 lines per screen, after which, they press tab or enter to continue next 10 lines.

Re: c++ reading a large text file with fstream

nuttynibbles26-Nov-09 22:59

nuttynibbles

26-Nov-09 22:59

hmm i got it. its pretty simple acutally. i just simply find the difference between the counter and the prev 50 page.

it looks like this:

<br />
char logfile[10] = "log.txt";<br />
		char data[100];<br />
	  <br />
	  fstream open_logviewer(logfile, ios::in);<br />
    <br />
    int counter = 1;<br />
    int prev = 0;<br />
	  while(!open_logviewer.eof()){<br />
      open_logviewer.getline(data,100);<br />
      cout << data << endl;<br />
  <br />
      if((counter - prev) == 50){<br />
        prev = counter;<br />
        system("pause");<br />
      }<br />
<br />
      counter++;<br />
    }  <br />
	  open_logviewer.close();<br />
<br />

Re: c++ reading a large text file with fstream

Richard MacCutchan26-Nov-09 23:36

Richard MacCutchan

26-Nov-09 23:36

nuttynibbles wrote:
if((counter - prev) == 50){

What is the point of prev? A simple counter from 1 to 50 is all that's needed, resetting to 1 every time it hits 50. Something like:

if(counter++ == 50)
{
    system("pause");
    counter = 1;
}

Re: c++ reading a large text file with fstream

nuttynibbles27-Nov-09 2:01

nuttynibbles

27-Nov-09 2:01

this idea also works. thks Big Grin | :-D

Accessing the command line via Visual C++

N. Rackley26-Nov-09 21:57

N. Rackley

26-Nov-09 21:57

Hey everyone!

I'm currently working on a project that is going to require access to various command line applications. Mostly in order to grab status updates from various processes that are running on the system.

A sample of the command line program would be as follows:

C:\Program\Folder>System.exe -Enable "10:22:00" -Disable "10:23:00"
SYSTEM ONLINE - 11/25/2009 10:22:35 GMT
SYSTEM ONLINE - 11/25/2009 10:22:40 GMT
SYSTEM ONLINE - 11/25/2009 10:22:45 GMT
SYSTEM ONLINE - 11/25/2009 10:22:50 GMT
SYSTEM ONLINE - 11/25/2009 10:22:55 GMT
SYSTEM OFFLINE - 11/25/2009 10:23:00 GMT
SYSTEM OFFLINE - 11/25/2009 10:23:05 GMT
SYSTEM OFFLINE - 11/25/2009 10:23:10 GMT

Etc. Etc. Etc.

I need to be able to grab that system status from this and other programs and return them to a GUI application in Visual C++.

How can I grab the resultant output of the console as a string? I realize that many people simply dump the data to a file and then read from the file, but I'm looking for something a bit more direct. Is this even the correct way to approach the problem of grabbing status from an external process? My restrictions are that it does have to be for Windows and in Visual C++.

Thanks for the help!

-N. Rackley

Re: Accessing the command line via Visual C++

Richard MacCutchan27-Nov-09 2:19

Richard MacCutchan

27-Nov-09 2:19

You will probably need to use the system() or _popen() call to get what you need. Take a look at the MSDN references[^] for more information.

Re: Accessing the command line via Visual C++

Michael Schubert27-Nov-09 2:35

Michael Schubert

27-Nov-09 2:35

Have a look at this page:
http://support.microsoft.com/kb/190351[^]

Possibly not exactly what you are looking for but it gets you started on Input/Output handles and redirection.

Also, search for "redirection" in the following article section:
http://www.codeproject.com/KB/threads/[^]

Use Ctrl+Left/Right to switch messages, Ctrl+Up/Down to switch threads, Ctrl+Shift+Left/Right to switch pages.