C / C++ / MFC

Re: linking error messages

11-May-04 8:32

LNK2019 is a .NET thing, but you'll also see it as LNK2001 on other platforms. See if this helps.

"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)

Anonymous11-May-04 9:16

Anonymous

11-May-04 9:16

Thank you very much it is really helpful and now I got no more linking error.
Thank you again.

Re: linking error messages

Anonymous11-May-04 18:32

Anonymous

11-May-04 18:32

Sounds like you setup the project to build a Windows application, when you've probably coded for a console application. To fix the unresolved external symbol_WinMain@16 referenced in function _WinMainCRTStartup go into your project settings and change the "/subsystem:windows" project setting to "/subsystem:console". That should clear up the error. Hope this helps.

Regards,

TIF file display

LasVegasGuy11-May-04 6:58

LasVegasGuy

11-May-04 6:58

I need to display a tif file as a thumbnail on a dialog box. Is there any Activex control available that I can use?
thanks

Man Learns from History that he never learns from History

Re: TIF file display

Anthony_Yio12-May-04 2:21

Anthony_Yio

12-May-04 2:21

Check out

http://www.codeproject.com/vcpp/gdiplus/GdiPThumbnailsViewer.asp

But it is in GDI+ and MFC though

Sonork 100.41263:Anthony_Yio

Life is about experiencing ...

System::String _gc* to char *

deniz79s11-May-04 6:56

deniz79s

11-May-04 6:56

I can't achieve this process in .Net Visual C++.

I use below code and the interpreter doesn't give any error at compile time but an error is occours at run time ("object referance not set to an object instance")

char *dosya;
String *dizi;

dizi=textBox1->Text;
dosya=new char(512);

dosya=reinterpret_cast<char *="">(dizi->ToCharArray());

also I used below code and the compiler gave an error at run time ("index was outside of range" like this I can't remember completly)

dosya=reinterpret_cast<char *="">(dizi->get_Chars(dizi->get_Lenght()));

for summary I can't get the characters from a System::String class to a char pointer. (instead of char to use wchar_t variable didn't solve the problem

Re: System::String _gc* to char *

HENDRIK R11-May-04 7:22

HENDRIK R

11-May-04 7:22

a look at msdn brings the following solution:

using namespace System::Runtime::InteropServices;

const char* str = (const char*)<br />
   (Marshal::StringToHGlobalAnsi(managedString)).ToPointer();<br />
// use str as you wish or copy it elsewhere<br />
// free string<br />
Marshal::FreeHGlobal(IntPtr((void*)str));

We are men. We are different. We have only one word for soap. We do not own candles. We have never seen anything of any value in a craft shop. We do not own magazines full of photographs of celebrities with their clothes on. - Steve

Connected Printers.

Prakash Nadar11-May-04 6:23

11-May-04 6:23

How do i query for modems connected to the pc??

Thanx.

I'll write a suicide note on a hundred dollar bill - Dire Straits

David Crow11-May-04 7:02

11-May-04 7:02

So are you wanting to know about printers or modems?

"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)

Prakash Nadar11-May-04 16:10

11-May-04 16:10

DavidCrow wrote:
So are you wanting to know about printers or modems?

hehe,
my mistake, its modem Smile | :)

EnumPrinters(...) will do for printers, could not find something similar for modems.

I'll write a suicide note on a hundred dollar bill - Dire Straits

David Crow12-May-04 2:05

12-May-04 2:05

How about the Win32_POTSModem WMI class?

"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)

Prakash Nadar12-May-04 7:08

12-May-04 7:08

DavidCrow wrote:
Win32_POTSModem

Thanx but this class requirement is win2k and above, looking for something that will work in win98 as well.

Here is one logic i developed , havent tested it yet.

first enumerate through all the ports in the pc,
create a handle to it by using CreateFile api.

then call GetCommProperties(...) get the info about the handle, the structure returned gives the info wheather its a printer, modem, etc.

How is this logic? only problem i feel is that since i have to create a file handle of the port, i woun't be able to do it if its already in use.

I'll write a suicide note on a hundred dollar bill - Dire Straits

David Crow12-May-04 7:16

12-May-04 7:16

Mr.Prakash wrote:
Thanx but this class requirement is win2k and above, looking for something that will work in win98 as well.

It usually helps to list all of the requirements up front so that we can avoid unnecessary suggestions.

Mr.Prakash wrote:
How is this logic? only problem i feel is that since i have to create a file handle of the port, i woun't be able to do it if its already in use.

It sounds solid, but the only way to know for sure is to try it on several machines. At a minimum, you'd need:

a machine with no modem and no network card

a machine with a modem and no network card

a machine with a network card and no modem

a machine with both a modem and a network card

The only reason I suggest a network card is to verify that the code can differentiate between different types of network connections.

"The pointy end goes in the other man." - Antonio Banderas (Zorro, 1998)

Prakash Nadar12-May-04 7:25

12-May-04 7:25

DavidCrow wrote:
It sounds solid, but the only way to know for sure is to try it on several machines

yeah will do that soon Smile | :)

Thanx again.

I'll write a suicide note on a hundred dollar bill - Dire Straits