C / C++ / MFC

Re: Unexpected linker fault

9-Mar-08 3:38

I think Gdiplus.lib is included to the project settings for debug configuration and not for release configuration. add to release config also,

or add to the common header the following, stdafx.h if using precompiled header.
#pragma comment (lib, "Gdiplus.lib")

CPallini9-Mar-08 3:41

unqualified name in template

9-Mar-08 3:41

Probably project properties for Debug build contain correctly gdiplus.lib as additional library to link, while for Release build it don't.
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George_George9-Mar-08 3:07

George_George

9-Mar-08 3:07

Hello everyone,

About Bjarne's statement in section C.13.8.3 Point of Instantiation Binding, I have made some further thinking and coding. Here are my two questions.

--------------------
Nor can an unqualified name used in a template ever be bound to a local name.
--------------------

1. Sometimes we use qualified name in template? I have never usage of qualified names in template. Does Bjarne means some code like this, Does such use rare?

(suppose Foo is a template class)

Foo<::myType> or Foo<Somenamespace::myType> or Foo<SomeClass::myType>

2,

Does Bjarne indicate qualified names used in a template coule be bound to a local name? For example, we define a local namespace, put a struct in the local namespace, then we could use localNameSpace::strctInLocalNameSpace to instantise the template?

Puesdu code like this.

void f()
{
// inside local function f
namespace localns {
    struct foo;
};
vector<localns::foo> vc;
}

thanks in advance,
George

Detailed .map file

ForNow9-Mar-08 2:54

ForNow

9-Mar-08 2:54

Is there a way to get a detailed .map file

I have a large structure which is exported in the structure

I have some arrays of structures of which I don't think is the length I am expecting due to a storage overlay durning exection

The number of elements in the structure array is defined with a #defined varaible

e.g.
#define num 30

typedef
struct
{

} A;

A b[num];

due to storage overlay durning exection I dont think b is the length I excpect it to be

Thankx

Record the number of command clicks on the main GUI

Golden Lee9-Mar-08 1:47

Golden Lee

9-Mar-08 1:47

Hi,
I'm trying to record user operations (i.e. mouse clicks and/or keystrokes) to certain commands such as Open, Save, Play, Render, and so on. For example, I can use std:map<std::string sCommandID, int iVisit> to count up mouse clicks and/or keystrokes because I want to maintain a commands visiting history list (ordered from the most cliked command to the least clicked one) for each current login user to my application. When the user login to the application, the a commands visiting history list will be presented as an easy reach position on the screen. Worthy of mention is that I want to record the user operations occurred only on main GUI, for example buttons on the toobar, status bar, task pane, main menu bar, and etc. Unlike the screen capture programs (for example, Northon Screen Cam), I don't want to capture the mouse movement, and save the on-screen pictures dynamically at a certain frame rate.

What Microsoft development library or API functions shall I use? Could you give me some programming tips concerned?
Thank you.

GoldenLee

Re: Record the number of command clicks on the main GUI

Rajkumar R9-Mar-08 3:08

9-Mar-08 3:08

Golden Lee wrote:
I want to maintain a commands visiting history list (ordered from the most cliked command to the least clicked one) for each current login user to my application

since it is your application, you can add the values to map at each message handler of the commands.

see here [^] if you want to get the user login info for the application.

DLL Plugins

Ivan-bg9-Mar-08 1:18

Ivan-bg

9-Mar-08 1:18

Hello everybody!

I've got a problem that's been bugging me for some time.

There are a certain number of functions that need to be transformed into dll-s. I've read pretty much all the articles about that on codeproject and that's fine, but I'm still not really confident with windows programming.

You see, every function has to be in its own dll and I have to make a dll-plugin manager. The main thing is that the functions can take a different number and type of arguments - (ex. f1(string s, string s2, string s3), f2(string s, double d)...)

The first argument (string s), and the return value are common for all functions. Is it possible, for example, to have only that one argument (thus achieving uniformity), and take the rest through some kind of message boxes in the function itself? Or is there a better way?

Thank you in advance!

CPallini9-Mar-08 3:48

9-Mar-08 3:48

Ivan-bg wrote:
ou see, every function has to be in its own dll

One DLL for one function? It seems against the very nature of the DLL, that is a dynamic library of functions.

Ivan-bg wrote:
The first argument (string s), and the return value are common for all functions. Is it possible, for example, to have only that one argument (thus achieving uniformity), and take the rest through some kind of message boxes in the function itself? Or is there a better way?

You can always pass just a pointer to a struct.

Ivan-bg9-Mar-08 4:50

Ivan-bg

9-Mar-08 4:50

I wasn't precise enough. I was talking about the main class of functions, that have to be separated. Each dll will contain 4 more functions that are of the same type.

I would pass a pointer to a struct, but the point is that the program is supposed to be extendable - anyone could add another algorithm (main function), which takes a string and a certain number of parameters of different types. That's why I can't make any assumptions about the number and type of parameters, or struct members.

Any ideas?

CPallini9-Mar-08 5:46

9-Mar-08 5:46

Ivan-bg wrote:
Any ideas?

Yes, pass an array of VARIANTs.
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C^hris L^osinger9-Mar-08 15:46

C^hris L^osinger

9-Mar-08 15:46

pass everything as XML

Open Excel file,Error

TaoteSea8-Mar-08 23:21

TaoteSea

8-Mar-08 23:21

Open Excel file,Error

_ConnectionPtr m_adoConn;
_RecordsetPtr m_adoRec;
::CoInitialize(NULL);
m_adoConn.CreateInstance(__uuidof(Connection));
m_adoConn->Open("Provider=Microsoft.Jet.OLEDB.4.0;Data Source=c:\\1.xls;Extended Properties=Excel 8.0;IMEX=1;","","",adModeUnknown);

stop this function:
inline HRESULT Connection15::Open ( _bstr_t ConnectionString, _bstr_t UserID, _bstr_t Password, long Options ) {
HRESULT _hr = raw_Open(ConnectionString, UserID, Password, Options);
if (FAILED(_hr)) _com_issue_errorex(_hr, this, __uuidof(this));
return _hr;
}

why error
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Re: Open Excel file,Error

CPallini8-Mar-08 23:34

Re: Open Excel file,Error

8-Mar-08 23:34

What error do you get (usually errors are quite informative)? On what line of code?

Hamid_RT9-Mar-08 0:46

Hamid_RT

9-Mar-08 0:46

Can you more explain?

what are the differences among try...catch,__try...__except and try...finally? [modified]

kcynic8-Mar-08 19:17

Re: what are the differences among try...catch,__try...__except and try...finally?

8-Mar-08 19:17

there are several choices of exceptions handling for c/c++(win32 platform).
but what are the differences among try...catch, __try...__except,and try...finally?
and when we should use the most suitable one of them?

Regards.

modified on Sunday, March 9, 2008 1:28 AM

Rajkumar R8-Mar-08 21:43

Re: what are the differences among try...catch,__try...__except and try...finally?

8-Mar-08 21:43

that are the difference between structure exception and C++ exception. please refer Exception Handling Differences[^]

kcynic8-Mar-08 22:01

Re: what are the differences among try...catch,__try...__except and try...finally?

8-Mar-08 22:01

but they are more complex in my mind,for example

DWORD test()
{ //cout<<"A exception handled."<<endl;
return EXCEPTION_EXECUTE_HANDLER;
}
void main()
{
try//__try
{
__asm int 3;
}
catch//__except(test())
{
cout<<"A exception "<<endl;
}
}

here,the program can't work will ,but if replaced by __try...__except,it works well.why?

Mircea Puiu8-Mar-08 22:15

Mircea Puiu

8-Mar-08 22:15

Structured exception handling works with C and C++ source files.
It was not designed for C++ specifically. To ensure your code is portable, you will want to use C++ exception handling.

As stated by MSDN, for "C++ programs, C++ exception handling should be used instead of structured exception handling"

SkyWalker

Re: what are the differences among try...catch,__try...__except and try...finally?

kcynic8-Mar-08 22:28

Re: what are the differences among try...catch,__try...__except and try...finally?

8-Mar-08 22:28

thanks.
I will go and read it carefully.

Rajkumar R9-Mar-08 3:47

Re: what are the differences among try...catch,__try...__except and try...finally?

9-Mar-08 3:47

If this a C program, i think you cannot use C++ exception.

kcynic9-Mar-08 14:57

Re: what are the differences among try...catch,__try...__except and try...finally?

9-Mar-08 14:57

but if i treat it as a c++ program?
the code can be compiled and linked no matter i use try...catch or __try...__except.
the only difference is the result of running.

Rajkumar R9-Mar-08 21:33

Re: what are the differences among try...catch,__try...__except and try...finally?

9-Mar-08 21:33

By default, VS2005 uses synchronous exception model by default. Try changing to /EHa (vsproperty->C/C++->Code generation->Enable C++ Exception = /EHa).
And read the msdn document whose link i already given (especially Synchronous & Asynchronous exception handling).

kcynic9-Mar-08 21:36