### Author:  [@zetazee85](https://forum.commonvisionblox.com/u/zetazee85)
#### Post date: [May 24, 2018, 9:46am UTC](https://forum.commonvisionblox.com/t/how-to-start-c-gev-server-correctly-using-cvb-sdk-api/463/1 "2018-05-24T09:46:49Z")
Hi,
I am learning how to use the CVB SDK to create a GigE Vision Server to act as a Virtual Camera to send image over to an image acquisition client.
I am able to successfully use the C# CVB SDK to do so.
However, when trying to replicate the same thing in C++ SDK, I am unable to use the CVB Management Console to discover the Virtual Camera, much less acquiring it.
I used netstat -an -u udp, and is able to see that port 3956 is started by the GEV server. However, CVB management console is not able to discover it.
Below is a snippet of my main C++ code:
\*My C++ CVB project can be compiled successfully, and there are no exceptions when running the console application.
Any help or enlightenment on why I am not able to discover the GEV Virtual Camera is appreciated.
int main(int argc, char\* argv[])
{
cout \<\< “start gev server\n”;
```
IMG img;
cvbres_t nResult = LoadImageFile("%CVB%\\Tutorial\\ClassicSwitch.emu", img);
if (nResult < 0)
throw std::exception();
TDriver nDriver = DT_Filter;
m_hGevServer = CreateGevServerEx(nDriver);
// configure server
nResult = GSSetImage(m_hGevServer, img);
if (nResult < 0)
throw std::exception();
// set acquisition mode
TAcquisitionMode acqMode = AM_Automatic;
GSSetAcquisitionMode(m_hGevServer, acqMode);
// register server events
if (IsGevServer(m_hGevServer))
{
GSRegisterEvent(m_hGevServer, SE_Connected, &Empty, NULL, m_nSERemoteEndpointConnectedEventID);
GSRegisterEvent(m_hGevServer, SE_Disconnected, &Empty, NULL, m_nSERemoteEndpointDisconnectedEventID);
GSRegisterEvent(m_hGevServer, SE_AcquisitionStart, &Empty, NULL, m_nSEAcquisitionStartEventID);
GSRegisterEvent(m_hGevServer, SE_AcquisitionStop, &Empty, NULL, m_nSEAcquisitionStopEventID);
GSRegisterEvent(m_hGevServer, SE_ImageSnapped, &Empty, NULL, m_nSENewImageEventID);
}
// add custom feature in category
AddGenICamFeatures();
// set custom version/id
nResult = GSSetInfoAsString(m_hGevServer, GSI_ServerUserVersion, "_C++-Example");
if (nResult < 0) throw std::exception();
nResult = GSSetInfoAsInteger(m_hGevServer, GSI_XMLVersionMajor, 1);
if (nResult < 0) throw std::exception();
nResult = GSSetInfoAsInteger(m_hGevServer, GSI_XMLVersionMinor, 0);
if (nResult < 0) throw std::exception();
nResult = GSSetInfoAsInteger(m_hGevServer, GSI_XMLVersionSubMinor, 0);
if (nResult < 0) throw std::exception();
// start server
std::vector m_Interfaces;
GEVIFACELIST ifaceList = CreateInterfaceList();
size_t nIfaces = ILCount(ifaceList);
for (size_t nIndex = 0; nIndex < nIfaces; ++nIndex)
{
// add IP to interfaces list
gsipv4 nIP = 0;
ILIPv4Address(ifaceList, nIndex, nIP);
m_Interfaces.push_back(nIP);
}
gsipv4 nIP = m_Interfaces[2]; //for 172.29.54.161
nResult = GSStartIPv4(m_hGevServer, nIP);
if (nResult < 0)
throw std::exception();
cout << "gev server started " << nResult << "\n";
while (true)
{
}
return 0;
```
}
---
### Author:  [@TStadler](https://forum.commonvisionblox.com/u/TStadler)
#### Post date: [May 25, 2018, 8:22am UTC](https://forum.commonvisionblox.com/t/how-to-start-c-gev-server-correctly-using-cvb-sdk-api/463/2 "2018-05-25T08:22:38Z")
Hi, could you post your whole project?
This way it is easier for us to find the problem.
---
### Author:  [@zetazee85](https://forum.commonvisionblox.com/u/zetazee85)
#### Post date: [May 25, 2018, 8:56am UTC](https://forum.commonvisionblox.com/t/how-to-start-c-gev-server-correctly-using-cvb-sdk-api/463/3 "2018-05-25T08:56:23Z")
Hi Tim,
I have uploaded the CPP (not working) and CSharp (working) zipped Visual Studio project.
CPP - GEVServerTestCpp.zip [Download Link](https://drive.google.com/open?id=1FO1-KlyJpNVD4Fxlf24P1dA-wL36BZUN)
CSharp - CSGEVServerTest.zip [Download Link](https://drive.google.com/open?id=1pCPphgDcm_STXfDrJjqm3xUKmRoAiMlx)
Thank you for the assistance.
---
### Author:  [@TStadler](https://forum.commonvisionblox.com/u/TStadler)
#### Post date: [May 25, 2018, 9:04am UTC](https://forum.commonvisionblox.com/t/how-to-start-c-gev-server-correctly-using-cvb-sdk-api/463/4 "2018-05-25T09:04:24Z")
Hmm your C++ example is working just fine for me (only thing I did was update the Visual Studio Toolset).
Could you try a different IP?
---
### Author:  [@zetazee85](https://forum.commonvisionblox.com/u/zetazee85)
#### Post date: [May 26, 2018, 1:32am UTC](https://forum.commonvisionblox.com/t/how-to-start-c-gev-server-correctly-using-cvb-sdk-api/463/5 "2018-05-26T01:32:36Z")
Hi tim,
I am using Visual Studio 2013 to develop the attached C++ project. It can be compiled successfully and run with the GEV port 3956 utilized, but I am not able to discover the GEV virtual camera on the CVB management console.
You were able to do so for my C++ project?
---
### Author:  [@zetazee85](https://forum.commonvisionblox.com/u/zetazee85)
#### Post date: [May 28, 2018, 2:49am UTC](https://forum.commonvisionblox.com/t/how-to-start-c-gev-server-correctly-using-cvb-sdk-api/463/6 "2018-05-28T02:49:38Z")
Hi Tim,
I managed to resolve the issue with my C++ application.
When i changed the directory of the image emulator to the one on my desktop, then the application is working.
I suspect is to do with the permission access to the image emulator in the Program Files.