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I need some hint/help here - I am getting this linker error after I build a DLL using " Regular DLL using shared MFC DLL" option in MFC DLL wizard.
My #include "OpenHR_DLL_Test\OpenHR_DLL_Test.h" is in stdafx.h
I do have the proper library in my Project Setting - Link -General - Object/Library modules as
OpenHR_DLL_Test/Debug/OpenHR_DLL_Test.lib.
I am using VC++ 6.0 and get no compiler errors, except the linker:
Linking...
OpenHR.obj : error LNK2001: unresolved external symbol "public: __thiscall COpenHR_DLL_TestApp::COpenHR_DLL_TestApp(void)" (??0COpenHR_DLL_TestApp@@QAE@XZ)
Debug/OpenHR.exe : fatal error LNK1120: 1 unresolved externals
Error executing link.exe.
This is my first attempt on MFC DLL and I have no clue what I missed.
I am not to comfortable troubleshooting linker errors - so a general reference to "how to" would be also appreciated.
Thanks for your help.
Vaclav
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0. It would be easier for you to use a MFC extension DLL at beginning.
Such DLLs do not have own applications instances... 
1. Try to find any usage of COpenHR_DLL_TestApp in your code (OpenHR.cpp ?):
it should not be used outside of its owner DLL Check your definition of Irrationality[ ^]
1 - Avicenna
5 - Hubbard
3 - Own definition
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Eugen,
please clarify "outside of its owner DLL".
I do access this DLL in
BOOL COpenHRApp::InitInstance()
{
....
That must be the "problem"?
So how do I use the DLL?
Forgive me these ignorat statements, but this is my first attemt to use DLL.
Vaclav
BTW I tryed MFC extension DLL and got same linker error. Not suprised if the above is correct.
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The InitInstance() of your DLLs application is a task of the Loader,
that is a part of your Windows OS...
Usually -
the people use exported classes and functions of a DLL only
That is why
the wizard does not make the class of the DLLs application exported Check your definition of Irrationality[ ^]
1 - Avicenna
5 - Hubbard
3 - Own definition
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I have no idea what "OpenHR" is, but I'll try to help based on what you've posted.
Vaclav_Sal wrote: Linking...
OpenHR.obj : error LNK2001: unresolved external symbol "public: __thiscall COpenHR_DLL_TestApp::COpenHR_DLL_TestApp(void)" (??0COpenHR_DLL_TestApp@@QAE@XZ)
Debug/OpenHR.exe : fatal error LNK1120: 1 unresolved externals
Error executing link.exe.
The first thing to note about a linker error is that everything compiled Ok: all the declarations of the required classes and methods are present. The linker error indicated that it can't find "COpenHR_DLL_TestApp::COpenHR_DLL_TestApp(void)" in "OpenHR.obj". This suggests that the file OpenHR.cpp attempts to construct a COpenHR_DLL_TestApp but the definition for the constructor isn't present (only its declaration). The first step is to have a look and see if it exists.Steve
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the *cpp in which the class COpenHR_DLL_TestApp is implemented got to be included in the project. Or the lib.
Somehow is the ctor declared but not implemented.Press F1 for help or google it.
Greetings from Germany
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Many thanks to all who replied, I really appreciate it.
But ... I am still confused.
I think the terminology used is part of the confusion.
Let me attempt to clarify what I have done so far.
So I have a application - MFC DLL with *.cpp and *.h files.
I have done this
1. Created "child" direcotory to mine main program - COpenHR_DLL_Test
2. Used wizard to build the MFC DLL "application"
3. Build the COpenHR_DLL_Test DLL.
4. Added this COpenHR_DLL_TestApp to my workspace.
5. Made COpenHR_DLL_TestApp dependent on main application ( OpenHR)
6. Put #include "OpenHR_DLL_Test\OpenHR_DLL_Test.h" into stdafx.h
6.Added the *.lib (in Project - Settings -Link ) OpenHR_DLL_Test/Debug/OpenHR_DLL_Test.lib
7.copied OpenHR_DLL_Test.dll into windows/system32 – I understand it is not necessary
8.Sucessfuly compiled and linked both project in workspace.
9.Added in
BOOL COpenHRApp::InitInstance()
{
COpenHR_DLL_TestApp m_COpenHR_DLL_TestApp;
10.Now it will compile with described linker error.
What you have told me I am missing the implementation of the constructor.
I just do not see where.
I have the header file of the DLL included and the libraly linked.
What else is there??
Here is quote from the *.h as generated by wizard.
// COpenHR_DLL_TestApp
// See OpenHR_DLL_Test.cpp for the implementation of this class
//
In the meantime I'll try using the MFC DLL extension option in the MFC DLL wizard.
Vaclav
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Beeing a geenhorn in MFC DLL I missed AFX_EXT_CLASS !!
Or did the wizard missed it?
I blame it on wizard! It should be smarter - it is building MFC extension DLL in first place!
Or at least make some smart remarks about it!
Anyway, thanks for all you help.
class AFX_EXT_CLASS OpenHR_DLL_Test : public CWnd
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Hai,
Can Anyone give me a link to connect to MySqlServer using CDataBase Class. I searched a lot but i am not able to find out a proper link.Can anyone help me on this??
Thanks,
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Hi all,
I have developed one win32 dll in VC++ for windows mobile. I need to do some work after each 1 hour, So I want to use Timer in this dll.
Can any one please let me know that how can i use Timer in dll?
Regards,
Rahul Vaishnav
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See my answer to (your ?) same post here[^].
ARWhen the wise (person) points at the moon the fool looks at the finger (Chinese proverb)
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I have a parent process that creates a child process that in turn exchanges data with an external network addressed computer. I would like the parent to be able to monitor the amount of data the child is sending and receiving. The application runs on W2K through Win7 and is written in C/C++. I already have the handles and PIDs of both the parent and child and know the internal IP address, external IP address and the IP address and port on the external network computer. I found some sniffer articles on here that may apply but they require a driver installed which I can not allow. Any suggestions or help is appreciated.
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I had a thought ... write a high speed tcp/ip proxy server to sit 'inbetween' your end-points - it simply needs to add up bytes/packets in/out and present that into in a shared-memory area or such
but thats an extra component ! in reality its doing the same as WinPCAP in stats mode, just from a higher level
'g'
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I was hoping someone knew of an API call that I wasn't able to find perhaps something like:
GetProcessIoCounters or GetIpStatistics or GetTcpTable but I'm not sure if any of these are appropriate.
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well, I have seen a C# way of doing it but cant remember all the steps to capture packets .. my first thought was also that it could cause performance issues on the local machine at least ...
I think they opened a socket for receive, bound something like IP-Address-Any to it and then received all the packets from the network adaptor, mapping the packet receive to an event that they could monitor/wait for ... when the event was tripped that had a packet obkect they decoded the basic fields from - I just cant remember who did it and what the pitfalls were
Actually David Crow has an article here about GetIPStatistics, the best thing to do is 'suck it and see' - if as a standalone it gives you what you're looking for you could look at including his functionality in your program (and crediting him of course) - see More on using IP Helper API’s[^]
'g'
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That article is really nice. I wish I found that in my search when I was trying to do several of those things. Unfortunately the links in the reference section that I wanted to follow were all bad.
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| Is the child process yours? If so forget all this fancy stuff and just have the child process report its progress to the parent (or otherwise publish them where the parent can access). Steve
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No, only the parent process is my code. But I do have access to the child via the PID and its handle as well as knowing all the IP addresses involved in the transfers. I don't really care if the answer is totally accurate, but just a general knowledge that the link is alive and continually sending data back and forth.
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Ok. Can you tell us any more about the "child" application? For example, it may be able to split out progress reports to stdout in which case pipes and output redirection could be used. This is just an example, but you get the idea: it may already provide a notification mechanism you can use.Steve
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I have to threat the child process as a black box producer / consumer as one end of a network device. I have full control over launching the process but it must run as a normal independant app.
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Hi
I'm trying to re-enable a disabled button by right clicking on the button. I know that the message is not sent to the parent window for disabled buttons. Is there a workaround solution on receiving messages for disabled controls?
Thanks
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