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 # Example 02 - C++ 

 Last update: 16.07.2025 

# <a class="anchor" id="ex02_s2"></a>C++

// CppStandaloneApplication.cpp : Defines the entry point for the console application.

 

\#include "stdafx.h"

\#include &lt;stdlib.h&gt;

\#include &lt;stdio.h&gt;

\#include &lt;iostream&gt;

\#include&lt;fstream&gt;

\#include &lt;string&gt;

\#include &lt;ctime&gt;

\#include &lt;functional&gt;

\#include &lt;assert.h&gt;

\#include &lt;windows.h&gt;

 

// Note - .tlh files will be generated from the .tlb files (above) once the project is compiled.

// Visual Studio will incorrectly continue to report IntelliSense error messages however until it is restarted.

\#include "zosapi.h"

 

using namespace std;

using namespace [ZOSAPI](namespace_z_o_s_a_p_i.xhtml);

using namespace ZOSAPI_Interfaces;

 

void handleError(std::string msg);

void logInfo(std::string msg);

void finishStandaloneApplication(IZOSAPI_ApplicationPtr TheApplication);

 

int RunApplication()

{

 CoInitialize(NULL);

 

 // Create the initial connection class

 IZOSAPI_ConnectionPtr TheConnection(__uuidof([ZOSAPI\_Connection](class_z_o_s_a_p_i_1_1_z_o_s_a_p_i___connection.xhtml)));

 

 

 // Attempt to create a Standalone connection

 IZOSAPI_ApplicationPtr TheApplication = TheConnection-&gt;CreateNewApplication();

 if (TheApplication == nullptr)

 {

 handleError("An unknown error occurred!");

 return -1;

 }

 

 // Check the connection status

 if (!TheApplication-&gt;IsValidLicenseForAPI)

 {

 handleError("License check failed!");

 return -1;

 }

 if (TheApplication-&gt;Mode != ZOSAPI_Mode::ZOSAPI_Mode_Server)

 {

 handleError("Standlone application was started in the incorrect mode!");

 return -1;

 }

 

 IOpticalSystemPtr TheSystem = TheApplication-&gt;PrimarySystem;

 

 // Add your custom code here...

 

 // creates a new API directory

 CreateDirectory(_bstr_t(TheApplication-&gt;SamplesDir + "\\\\API"), NULL);

 CreateDirectory(_bstr_t(TheApplication-&gt;SamplesDir + "\\\\API\\\\CPP"), NULL);

 

 // Set up primary optical system

 TheSystem = TheApplication-&gt;PrimarySystem;

 _bstr_t sampleDir = TheApplication-&gt;SamplesDir;

 

 // Open file

 _bstr_t testFile = sampleDir + "\\\\Non-sequential\\\\Miscellaneous\\\\Digital\_projector\_flys\_eye\_homogenizer.zos";

 TheSystem-&gt;LoadFile(testFile, false);

 

 // Creat ray trace

 INSCRayTracePtr NSCRayTrace = TheSystem-&gt;Tools-&gt;OpenNSCRayTrace();

 NSCRayTrace-&gt;SplitNSCRays = true;

 NSCRayTrace-&gt;ScatterNSCRays = false;

 NSCRayTrace-&gt;UsePolarization = true;

 NSCRayTrace-&gt;IgnoreErrors = true;

 NSCRayTrace-&gt;SaveRays = false;

 NSCRayTrace-&gt;ClearDetectors(0);

 

 // Run ray trace

 // Methods RunAndWaitForCompletion() and Close is in base interface ISystemTool.

 // To use these two methods, cast to ISystemTool first.

 ISystemToolPtr baseTool = NSCRayTrace;

 baseTool-&gt;RunAndWaitForCompletion();

 baseTool-&gt;Close();

 

 // Non-sequential component editor

 INonSeqEditorPtr TheNCE = TheSystem-&gt;NCE;

 

 // Get detector data

 double detectorData[100][100];

 

 for (int i = 0; i &lt; 99; i++)

 for (int j = 0; j &lt; 99; j++)

 TheNCE-&gt;GetDetectorData(4, j + i * 100, 1, &amp;detectorData[i][j]);

 

 // Export to text file

 fstream textfile;

 string filepath = sampleDir + "\\\\API\\\\CPP\\\\e02\_NSC\_ray\_trace.txt";

 textfile.open(filepath, fstream::trunc | ios::out);

 if (!textfile)

 {

 cerr &lt;&lt; "Can't open file!\\n";

 }

 else

 {

 for (int i = 0; i &lt; 99; i++)

 {

 for (int j = 0; j &lt; 99; j++)

 {

 textfile &lt;&lt; detectorData[i][j] &lt;&lt; "\\t";

 }

 textfile &lt;&lt; endl;

 }

 

 }

 

\#if defined(\_DEBUG)

 // keeps console open when in debug mode

 system("pause");

\#endif

 

 // Clean up

 finishStandaloneApplication(TheApplication);

 

 

 return 0;

}

 

void handleError(std::string msg)

{

 throw new exception(msg.c_str());

}

 

void logInfo(std::string msg)

{

 printf("%s", msg.c_str());

}

 

void finishStandaloneApplication(IZOSAPI_ApplicationPtr TheApplication)

{

 // Note - TheApplication will close automatically when this application exits, so this isn't strictly necessary in most cases

 if (TheApplication != nullptr)

 {

 TheApplication-&gt;CloseApplication();

 }

}

 

int APIENTRY _tWinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPTSTR lpCmdLine, int nCmdShow)

{

 return RunApplication();

}

 

int _tmain(int argc, _TCHAR* argv[])

{

 return RunApplication();

}

[ZOSAPI.ZOSAPI\_Connection](class_z_o_s_a_p_i_1_1_z_o_s_a_p_i___connection.xhtml)

**Definition:** ZemaxService.cs:198



[ZOSAPI](namespace_z_o_s_a_p_i.xhtml)

The ZOSAPI namespace contains classes for initially connecting to zemax. See also ZOSAPI_Connection,...

**Definition:** IAS_FieldCurvatureAndDistortion.cs:5