Re: how to get the lpCmdLine?thanks! - C / C++ / MFC Discussion Boards

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Re: Compile program C++ by Visual C++.NET

SAKURAVN21-Jul-05 17:52

SAKURAVN

21-Jul-05 17:52

If I ignore //#include<string>
//using namespace std;
It not errors.

I don't write by C standard very much, I can not understand.
Can you advise me the way fix it.

Re: Compile program C++ by Visual C++.NET

Christian Graus21-Jul-05 17:59

Christian Graus

21-Jul-05 17:59

SAKURAVN wrote:
I don't write by C standard very much, I can not understand.

Sure, no worries.

Basically, before there was a C++ standard, classes like string.h and iostream.h contained what existed of what eventually became the standard library. When the standard was ratified, the new headers were named without the .h. These new headers wrap everything in a namespace, called std. So, by including string.h AND string, you include two classes with the same name. If you used std::string everywhere and got rid of the using statement, you could do this. Otherwise, you have two classes of the same name trying to co-exist in the global namespace. Drop all references to string.h, replace them with string. So, reverse what you did above to make your code compile. The .h headers are deprecated, which means that in theory they could disappear one day, because they are not standard. Do the same with math.h and iostream, if you use it. Basically, anything in <>, try dropping the .h to see if it's deprecated.

Now, moving on, why do you include malloc.h ?

Christian Graus - Microsoft MVP - C++

Re: Compile program C++ by Visual C++.NET

SAKURAVN21-Jul-05 18:22

SAKURAVN

21-Jul-05 18:22

Sorry! I don't use malloc.h
if in .cpp file oly have #include <string>
using namespace std;
It still errors:
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include\XUTILITY(862) : error C2143: syntax error : missing ';' before '<'
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include\XUTILITY(935) : see reference to class template instantiation 'std::istreambuf_iterator<_Elem,_Traits>' being compiled
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include\XUTILITY(862) : error C2238: unexpected token(s) preceding ';'
c:\Program Files\Microsoft Visual Studio .NET 2003\Vc7\include\XUTILITY(863) : error C2143: syntax error : missing ';' before '<'

Re: Compile program C++ by Visual C++.NET

Christian Graus21-Jul-05 18:34

Christian Graus

21-Jul-05 18:34

SAKURAVN wrote:
Sorry! I don't use malloc.h

Great - remove it then Smile | :)

SAKURAVN wrote:
if in .cpp file oly have #include <string>
using namespace std;

Then you must have other cpp files that include the wrong thing. If I create a project that includes the right headers, it's not a problem. When I try to use the right headers on legacy projects I inherit, I get this same issue, and it's because someone else has written crappy code elsewhere in the system. You need to search for string.h throughout the project, and correct it every time.

Personally, I tend to include standard libraries in the stdafx and put the using statements I need in my cpp files.

Christian Graus - Microsoft MVP - C++

How to insert a number into table in oracle

zwzcode21-Jul-05 15:02

zwzcode

21-Jul-05 15:02

//I create a table A in the Oracle.Please see the follow
CREATE TABLE A
(
ID NUMBER(7) primary key
);

//Now ,I want to insert a reocrd in the table A;

_ConnectionPtr pConn=NULL;

pConn.CreateInstance(__uuidof(Connection));

_RecordsetPtr pRst=NULL;

pRst.CreateInstance(__uuidof(Recordset));

pConn->Provider="OraOLEDB.Oracle.1";

try
{
pConn->Open("","ISVISION","ISVISION",NULL);

pRst->CursorLocation=adUseClient;
pRst->Open("A",pConn.GetInterfacePtr(),adOpenStatic,adLockOptimistic,adCmdTable);

pRst->AddNew();
pRst->Fields->Item[0L]->Value=100L; //But it throw a excpetion here. I dont know the reason. If I alter the datatype of ID to CHAR(10) ,it is all right.
//这里就会出现异常，如果表A的ID的数据类型是CHAR(10)的，又不会出错？
pRst->Update();

pRst->Close();
pConn->Close();
}
catch (_com_error& e)
{
MessageBox(e.Description(),"error",MB_OK|MB_ICONWARNING);
return ;
}

if (pConn)
pConn.Release();
if (pRst)
pRst.Release();

Re: How to insert a number into table in oracle

Christian Graus21-Jul-05 15:07

Christian Graus

21-Jul-05 15:07

How many times were you intending to ask this question ?

What is the type of Value ? Is it a VARIANT ? If so, try setting up a variant, perhaps _variant_t (100L) will work. Or otherwise, it's possible that it's looking for a BSTR.

Christian Graus - Microsoft MVP - C++

Re: how to get the lpCmdLine?thanks!

Christian Graus21-Jul-05 15:06

Christian Graus

21-Jul-05 15:06

szcococut wrote:
lpCmdLine

This is the string that is passed in.

Christian Graus - Microsoft MVP - C++

Re: how to get the lpCmdLine?thanks!

Rick York22-Jul-05 16:59

Rick York

22-Jul-05 16:59

The really odd thing about command line argument handling is that MFC itself uses __argc and __argv to parse its arguments but gives it to apps as one single string. It makes no sense at all to me. Any app can include stdlib.h and access each individual argument if it wants to.

Upgrading to Visual C++.Net 2005

desmondling7821-Jul-05 14:31

desmondling78

21-Jul-05 14:31

Hi all,

I am a Visual C++ Developer using V6.0. Mostly I deal with MFC creating windows application.

What are your opinions about me upgrading to Visual C++.Net 2005? It seems to be quite different from V6.0 from what I see. If I develop applications using MFC in .Net 2005, are there any issues that I should watch out for?

What about manage and unmanaged code and the .Net framework? When I distribute my software, do I need to distribute the .Net framework for older OS such as Win98?

Please give me your comments.