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C / C++ / MFC

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Linkage Problem in MSVC 2008 (wxWidget 3.0 Application)

Member 1125835326-Mar-15 20:59

Member 11258353

26-Mar-15 20:59

Hi,
I'm developing a wxWidgets 3.0 project using this Json_spirit library with boost 1_46_0 in Visual Studio 2008.
I Edited all the Additional directories and Additional Dependencies in the properties
After compiling the project I'm getting linkage error like

"
error LNK2019: unresolved external symbol "bool __cdecl json_spirit::read(class std::basic_istream<char,struct std::char_traits<char> > &,class json_spirit::Value_impl<struct json_spirit::Config_vector<class std::basic_string<char,struct std::char_traits<char>,class std::allocator<char> > > > &)" (?J_read@json_spirit@@YA_NAEAV?$basic_istream@DU?$char_traits@D@std@@@std@@AEAV?$Value_impl@U?$Config_vector@V?$basic_string@DU?$char_traits@D@std@@V?$allocator@D@2@@std@@@json_spirit@@@1@@Z) referenced in function "private: class wxWindow * __cdecl HiFrame::ReadingJson(class wxWindow *,class wxString &,class wxString &)" (?ReadingJson@HiFrame@@AEAAPEAVwxWindow@@PEAV2@AEAVwxString@@1@Z) "

can anybody help me out to resolve this problem.??

thanks..

modified 27-Mar-15 5:20am.

Re: Linkage Problem

Richard MacCutchan26-Mar-15 21:16

Richard MacCutchan

26-Mar-15 21:16

You are missing a library in your linker section. Check the documentation for the library in question and it will tell you what you need to include.

Re: Linkage Problem

Member 1125835326-Mar-15 23:26

Member 11258353

26-Mar-15 23:26

"json_spirit.h" i have included this file for reading json file.

Re: Linkage Problem

Jochen Arndt27-Mar-15 0:11

27-Mar-15 0:11

Member 11258353 wrote:
"json_spirit.h" i have included this file for reading json file.

That is a header file used during compilation.

But you got a linker error telling you that a library is missing (the name may be json_spirit.lib).

Re: Linkage Problem

Member 1125835327-Mar-15 0:18

Member 11258353

27-Mar-15 0:18

yeah, I have included that lib also(json_spirit_lib.lib)
which is in json_spirit_v4.08\Debug path.
Still, The error is coming.

Re: Linkage Problem

Jochen Arndt27-Mar-15 0:30

27-Mar-15 0:30

Check the name and path of the library and the corresponding project settings. The path must be part of the library search path or the complete path must be specified.

Re: Linkage Problem

Member 1125835327-Mar-15 1:50

Member 11258353

27-Mar-15 1:50

Okay,
For json_spirit_lib.lib in properties->linker->additional Library directory i gave this path "D:\json_spirit_v4.08\Debug"

For json_spirit.h in properties->c++->additional include directories i gave this path
"D:\json_spirit_v4.08\json_spirit"

For boosting in properties->c++->additional include directories i gave this path
"D:\boost_1_46_0"

In properties->linker->Input->Additional dependencies i included json_spirit_lib.lib.

Still not getting,,

Re: Linkage Problem

Jochen Arndt27-Mar-15 2:14

27-Mar-15 2:14

To get more information you should enable verbose output for the linker (Project Settings - Linker - General - Show progress: VERBOSE).

You may also use the dumpbin command line utility (in the VC/bin directory) to check which functions are exported by the library.

The library must be build for your VS version. Did you build it yourself?

Did you get only one or multiple linker errors?

Re: Linkage Problem

Member 1125835327-Mar-15 2:21

Member 11258353

27-Mar-15 2:21

Getting Linkage errors at Both Json_spirit::Read() and Json_spirit::Write() functions.

Just again i build the lib. now i'm getting error like
1>c:\documents and settings\administrator\my documents\downloads\boost_1_46_0\boost\function\function_base.hpp(408) : fatal error C1128: number of sections exceeded object file format limit : compile with /bigobj

what to do??

modified 27-Mar-15 8:29am.

Re: Linkage Problem

Jochen Arndt27-Mar-15 2:46

27-Mar-15 2:46

The error message gave you the answer:

Member 11258353 wrote:
compile with /bigobj

You may also search the web for this error message related to boost.

Re: Linkage Problem

Member 1125835327-Mar-15 3:07

Member 11258353

27-Mar-15 3:07

Thanks Jochen Arndt

Need to open an instance of excel in the same process as my main program.

Raj Abhishek26-Mar-15 4:15

26-Mar-15 4:15

My software is an excel plug-in. We are using the C++ unit test framework embedded within Visual Studio to test it.

Now, in my C++ unit test-code, when I open excel ( e.g. through shellexecute ), Excel opens up in a separate process and hence, I am not able to test my add-in code in the test process.

How do I attach to the excel programatically so that I can follow the behaviour in the same process.

It's a unit-test scenario and hence, we are trying to do everything with least manual intervention.

Regards,
Raj Abhishek

Re: Need to open an instance of excel in the same process as my main program.

Melqui Andrade31-Mar-15 2:10

31-Mar-15 2:10

You need add the Interop.Excel.dll to your project. With that dll you can create a excel application to handle menus, bars, and so on.
The documentation is [here]

Controls, variable and dialogs

lor7526-Mar-15 1:10

26-Mar-15 1:10

Hello,

i'm quite new to MFC programming and I would like if my software architecture can be simplified.

Let's suppose to have an MFC program where I put a member variable in CView class. This variable is set by a control put in a dialog window called by a menù.
I usually set a control variable in order to get the control value in order to avoid the GetdlgItem command.
The value of the control is used to set a member variable inside tha class of the dialog window and then when i close the dialog I copy the value of the dialog's variable into the main window variable

control variable -> member variable of the dialog window -> member variable of the main Cview window

With this scheme I Have to use 3 variables for each controls and this is quite expensive.
Can anyone suggest me a simpler way to get to synchronize the variable used by the main window with the value of a control inside a dialog window?

Best regards.

Re: Controls, variable and dialogs

David Crow26-Mar-15 3:26

26-Mar-15 3:26

As I understand your problem, two variables are needed: one used by the dialog class, and the other used by the view class.

"One man's wage rise is another man's price increase." - Harold Wilson

"Fireproof doesn't mean the fire will never come. It means when the fire comes that you will be able to withstand it." - Michael Simmons

"You can easily judge the character of a man by how he treats those who can do nothing for him." - James D. Miles

Re: Controls, variable and dialogs

lor7526-Mar-15 4:19

26-Mar-15 4:19

Yes, two variables. But I don't know if there is a better way to get the same result.

Re: Controls, variable and dialogs

Freak3030-Mar-15 1:22

30-Mar-15 1:22

If you are worried about the memory needed to store several values twice, you could define a class or struct, create an object of it in your view class and pass the reference to this object to the dialog objects in their constructors. This way you only have 4 byte overhead per dialog.

The good thing about pessimism is, that you are always either right or pleasently surprised.

win32 - how avoid flickers?

Member 1154582425-Mar-15 11:50

Member 11545824

25-Mar-15 11:50

for avoid flickers i must do:
1 - use the WS_CLIPCHILDREN on parent window;
2 -

C++

case WM_ERASEBKGND:
                {
                    return (LRESULT) 1;
                }
                break;

seems be used only on parent window too.
the child controls are transparent:
(i use the button class for create a label. why?!? because be correctly transparent using the BS_OWNERDRAW style.)

C++

case WM_ERASEBKGND:
            {
                return (LRESULT)1;
            }
            break;

            case WM_CTLCOLORSTATIC:
            {
                return (LRESULT)GetStockObject(NULL_BRUSH);
            }
            break;
            case WM_PAINT:
            {
                PAINTSTRUCT test;
                BeginPaint(hwnd, &test);
                image imglabel(test.rcPaint.right-test.rcPaint.left,test.rcPaint.bottom - test.rcPaint.top);
                brush brshbackcolor(inst->clrBackColor);
                brshbackcolor.ToDC(imglabel);
                brush brshTransparent;

                FillRect(imglabel,&test.rcPaint,brshbackcolor);
                if(inst->imgtest.haveimage())
                    DrawHICONtoHDC(imglabel, inst->imgtest,1,1);
                SetBkMode(imglabel,TRANSPARENT);
                char *text=(char*)inst->strCaption.c_str();
                SetTextColor(imglabel,inst->clrTextColor );
                DrawTextEx(imglabel,text,-1,&test.rcPaint,DT_LEFT,NULL);
                if(inst->blnBorder==true)
                    DrawEdge(imglabel, &test.rcPaint,BDR_SUNKENINNER | BDR_RAISEDOUTER,BF_RECT);
                TransparentBlt(test.hdc,0,0,test.rcPaint.right,test.rcPaint.bottom,imglabel,0,0,test.rcPaint.right,test.rcPaint.bottom, inst->clrBackColor);
                //BitBlt(test.hdc,0,0,test.rcPaint.right,test.rcPaint.bottom,imglabel,0,0, SRCCOPY);
                EndPaint(hwnd, &test);
                return 0;
            }
            break;

and the how i readraw the window:

C++

RECT d;
                GetClientRect(hwnd,&d);
                RedrawWindow(hwnd,&d,nullptr,RDW_UPDATENOW | RDW_INVALIDATE | RDW_ERASENOW);

but when, with animation\timer, the next image is drawed above the older one, instead clean all control and then redraw it.
(i need avoid the flicker and draw the control correctly and not 1 image above other)
can anyone advice me?

Visual Studio C++ compiler empty functions

severin025-Mar-15 10:28

25-Mar-15 10:28

Does anyone know if the Visual Studio C++ compiler optimizes to eliminate calls to functions with empty definitions (nothing between the curly braces denoting the function's body)?
I am particularly interested in the 2010 and 2012 versions of the Visual Studio compiler.

Thank you.

Re: Visual Studio C++ compiler empty functions

Richard Andrew x6425-Mar-15 15:39

Richard Andrew x64

25-Mar-15 15:39

It would be easy enough for you to find this out for yourself. Create a small test program with such a function, and use Disassembly View to step through the code where the function is called.

OTOH, these are the two optimizations that I do know about:

1. It combines functions that have identical definitions, and
2. It eliminates functions that are never called

Both of these optimizations can be turned off in the Options dialog box.

The difficult we do right away...
...the impossible takes slightly longer.

Re: Visual Studio C++ compiler empty functions

Daniel Pfeffer25-Mar-15 23:00

25-Mar-15 23:00

It depends on whether the method is virtual. It would theoretically be possible to eliminate all calls to empty non-virtual methods. A virtual method may be overridden by a derived class, so the compiler must perform the virtual call.

(There may be some cases where the compiler can prove that the virtual call refers to the base class. In this case, the compiler could optimize the call away.)

As Richard suggests, the best way to check this is to write a short test program.

If you have an important point to make, don't try to be subtle or clever. Use a pile driver. Hit the point once. Then come back and hit it again. Then hit it a third time - a tremendous whack.

--Winston Churchill

Re: Visual Studio C++ compiler empty functions

Maximilien26-Mar-15 4:38

26-Mar-15 4:38

Yes, the compiler will eliminate useless calls (maybe not in DEBUG mode, but surely in RELEASE mode).

today's compiler are a lot more smarter than you can imagine.

Is there a particular reason for this question?

I'd rather be phishing!

Unable to get WTS_SESSION_LOGON event notification. How to capture the event when user log on to the machine.?

mbatra3124-Mar-15 0:09

24-Mar-15 0:09

Hi,

I have an application which captures Lock, Unlock, Logoff and Logon events of Windows OS. I am able to get the notifications for Lock, Unlock and Logoff, but not getting any notification when user Logs on to the machine. I am using WTS_SESSION_LOGON event to capture the Log on event.

How to capture the event when user log on to the machine.

Any help will be appreciated.

Regards,

Is there a way to accelerate the following algorithm for hamming distance calculation? By assembly language?

prime_tang23-Mar-15 23:37

23-Mar-15 23:37

The following code is a basic algorithm for hamming distance calculation, but due to the design of my application, it requires many times to use this algorithm, in order to improve application efficiency, I want to improve the efficiency of this algorithm, is there any appropriate methods? Assembly language possible?

C++

unsigned dist(const unsigned char *vec1, const unsigned char *vec2, unsigned dim)
{
    const unsigned char popCountTable[] =
    {
        0, 1, 1, 2, 1, 2, 2, 3, 1, 2, 2, 3, 2, 3, 3, 4, 1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5,
        1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5, 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
        1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5, 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
        2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, 3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7,
        1, 2, 2, 3, 2, 3, 3, 4, 2, 3, 3, 4, 3, 4, 4, 5, 2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6,
        2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, 3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7,
        2, 3, 3, 4, 3, 4, 4, 5, 3, 4, 4, 5, 4, 5, 5, 6, 3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7,
        3, 4, 4, 5, 4, 5, 5, 6, 4, 5, 5, 6, 5, 6, 6, 7, 4, 5, 5, 6, 5, 6, 6, 7, 5, 6, 6, 7, 6, 7, 7, 8
    };
    unsigned dist_ = 0;
    for (unsigned i = 0; i != dim; ++i)
    {
        dist_ += popCountTable[vec1[i] ^ vec2[i]];
    }
    return dist_;
}

Re: Is there a way to accelerate the following algorithm for hamming distance calculation? By assembly language?

Richard MacCutchan24-Mar-15 3:40

Richard MacCutchan

24-Mar-15 3:40

You should try at http://www.codeproject.com/Forums/326859/Algorithms.aspx[^], but you will need to provide more details of what this algorithm is doing and why your implementation is slow.

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