Hi ,
I am trying to call a member function of a class present in a header file(ApnCamera.h)
ApnCamera.h
Qt Code: 
  1. class CApnCamera
  2. {
  3. public:
  4. 	CApnCamera();
  5. 	~CApnCamera();
  6.  
  7. 	bool		GetDeviceHandle( void *hCamera, char *CameraInfo );
  8.  
  9. 	bool		InitDriver( unsigned long	CamIdA, 
  10. 									unsigned short	CamIdB, 
  11. 									unsigned long	Option );
  12.  
  13. 	bool				Expose( double Duration, bool Light );
  14.  
  15. }
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ApnCamera.cpp
Qt Code: 
  1. CApnCamera::CApnCamera()
  2.  
  3. {
  4.  
  5. 	AltaDebugOutputString( "APOGEE.DLL - CApnCamera::CApnCamera()" );
  6.  
  7.  
  8.  
  9. 	m_pvtPlatformType	= Apn_Platform_Unknown;
  10.  
  11. 	m_ApnSensorInfo		= NULL;
  12.  
  13. }
  14.  
  15. CApnCamera::~CApnCamera()
  16.  
  17. {
  18.  
  19. 	AltaDebugOutputString( "APOGEE.DLL - CApnCamera::~CApnCamera()" );
  20.  
  21.  
  22.  
  23. 	if ( m_ApnSensorInfo != NULL )
  24.  
  25. 	{
  26.  
  27. 		delete m_ApnSensorInfo;
  28.  
  29. 		m_ApnSensorInfo = NULL;
  30.  
  31.                 CloseDriver();
  32. 	}
  33.  
  34. }
  35. bool CApnCamera::Expose( double Duration, bool Light )
  36.  
  37. {
  38.  
  39. 	unsigned long	ExpTime;
  40.  
  41. 	unsigned short	BitsPerPixel;
  42.  
  43. 	unsigned short	UnbinnedRoiX;
  44.  
  45. 	unsigned short	UnbinnedRoiY;		
  46.  
  47. 	unsigned short	PreRoiSkip, PostRoiSkip;
  48.  
  49. 	unsigned short	PreRoiRows, PostRoiRows;
  50.  
  51. 	unsigned short	PreRoiVBinning, PostRoiVBinning;
  52.  
  53.  
  54.  
  55. 	unsigned short	RegVal;
  56.  
  57. 	unsigned short	RoiRegBuffer[15];
  58.  
  59. 	unsigned short	RoiRegData[15];
  60.  
  61.  
  62.  
  63. 	unsigned short	TotalHPixels;
  64.  
  65. 	unsigned short	TotalVPixels;
  66.  
  67.  
  68.  
  69. 	unsigned long	TestImageSize;
  70.  
  71.  
  72.  
  73. 	unsigned long	WaitCounter;
  74.  
  75.  
  76.  
  77. 	char			szOutputText[128];
  78. 	UnbinnedRoiY	= m_pvtRoiPixelsV * m_pvtRoiBinningV;
  79.  
  80.  
  81.  
  82. 	PreRoiRows		= m_ApnSensorInfo->m_UnderscanRows + 
  83.  
  84. 					  m_pvtRoiStartY;
  85.  
  86.  
  87.  
  88. 	PostRoiRows		= m_ApnSensorInfo->m_TotalRows -
  89.  
  90. 					  PreRoiRows -
  91.  
  92. 					  UnbinnedRoiY;
  93.  
  94.  
  95.  
  96. 	TotalVPixels = UnbinnedRoiY + PreRoiRows + PostRoiRows;
  97.  
  98.  
  99. 	// Program the horizontal settings
  100.  
  101. 	RoiRegBuffer[1]	= FPGA_REG_PREROI_SKIP_COUNT;
  102.  
  103. 	RoiRegData[1]	= PreRoiSkip;
  104.  
  105.  
  106.  
  107. 	RoiRegBuffer[2]	= FPGA_REG_ROI_COUNT;
  108.  
  109.  
  110.  
  111. 	// Number of ROI pixels.  Adjust the 12bit operation here to account for an extra 
  112.  
  113. 	// 10 pixel shift as a result of the A/D conversion.
  114.  
  115. 	if ( m_pvtDataBits == Apn_Resolution_SixteenBit )
  116.  
  117. 	{
  118.  
  119. 		RoiRegData[2] = m_pvtExposurePixelsH + 1;
  120.  
  121. 	}
  122.  
  123. 	else if ( m_pvtDataBits == Apn_Resolution_TwelveBit )
  124.  
  125. 	{
  126.  
  127. 		RoiRegData[2] = m_pvtExposurePixelsH + 12;
  128.  
  129. 	}
  130.  
  131.  
  132.  
  133. 	RoiRegBuffer[3]	= FPGA_REG_POSTROI_SKIP_COUNT;
  134.  
  135. 	RoiRegData[3]	= PostRoiSkip;
  136.  
  137.  
  138.  
  139. 	// Program the vertical settings
  140.  
  141. 	if ( m_pvtFirmwareVersion < 11 )
  142.  
  143. 	{
  144.  
  145. 		RoiRegBuffer[4] = FPGA_REG_A1_ROW_COUNT;
  146.  
  147. 		RoiRegData[4]	= PreRoiRows;
  148.  
  149. 		RoiRegBuffer[5] = FPGA_REG_A1_VBINNING;
  150.  
  151. 		RoiRegData[5]	= PreRoiVBinning;
  152.  
  153.  
  154.  
  155. 		RoiRegBuffer[6] = FPGA_REG_A2_ROW_COUNT;
  156.  
  157. 		RoiRegData[6]	= m_pvtRoiPixelsV;
  158.  
  159. 		RoiRegBuffer[7] = FPGA_REG_A2_VBINNING;
  160.  
  161. 		RoiRegData[7]	= (m_pvtRoiBinningV | FPGA_BIT_ARRAY_DIGITIZE);
  162.  
  163.  
  164.  
  165. 		RoiRegBuffer[8] = FPGA_REG_A3_ROW_COUNT;
  166.  
  167. 		RoiRegData[8]	= PostRoiRows;
  168.  
  169. 		RoiRegBuffer[9] = FPGA_REG_A3_VBINNING;
  170.  
  171. 		RoiRegData[9]	= PostRoiVBinning;
  172.  
  173.  
  174.  
  175. 		RoiRegBuffer[10]	= FPGA_REG_SCRATCH;
  176.  
  177. 		RoiRegData[10]		= 0;
  178.  
  179. 		RoiRegBuffer[11]	= FPGA_REG_SCRATCH;
  180.  
  181. 		RoiRegData[11]		= 0;
  182.  
  183. 		RoiRegBuffer[12]	= FPGA_REG_SCRATCH;
  184.  
  185. 		RoiRegData[12]		= 0;
  186.  
  187. 		RoiRegBuffer[13]	= FPGA_REG_SCRATCH;
  188.  
  189. 		RoiRegData[13]		= 0;
  190.  
  191. 	}
  192.  
  193. 	else
  194.  
  195. 	{
  196.  
  197. 		if ( m_ApnSensorInfo->m_EnableSingleRowOffset )
  198.  
  199. 		{
  200.  
  201. 			RoiRegBuffer[4] = FPGA_REG_A1_ROW_COUNT;
  202.  
  203. 			RoiRegData[4]	= 0;
  204.  
  205. 			RoiRegBuffer[5] = FPGA_REG_A1_VBINNING;
  206.  
  207. 			RoiRegData[5]	= 0;
  208.  
  209.  
  210.  
  211. 			RoiRegBuffer[6] = FPGA_REG_A2_ROW_COUNT;
  212.  
  213. 			RoiRegData[6]	= PreRoiRows;
  214.  
  215. 			RoiRegBuffer[7] = FPGA_REG_A2_VBINNING;
  216.  
  217. 			RoiRegData[7]	= PreRoiVBinning;
  218.  
  219.  
  220.  
  221. 			RoiRegBuffer[8] = FPGA_REG_A3_ROW_COUNT;
  222.  
  223. 			RoiRegData[8]	= m_pvtRoiPixelsV;
  224.  
  225. 			RoiRegBuffer[9] = FPGA_REG_A3_VBINNING;
  226.  
  227. 			RoiRegData[9]	= (m_pvtRoiBinningV | FPGA_BIT_ARRAY_DIGITIZE);
  228.  
  229.  
  230.  
  231. 			RoiRegBuffer[10] = FPGA_REG_A4_ROW_COUNT;
  232.  
  233. 			RoiRegData[10]	= 0;
  234.  
  235. 			RoiRegBuffer[11] = FPGA_REG_A4_VBINNING;
  236.  
  237. 			RoiRegData[11]	= 0;
  238.  
  239.  
  240.  
  241. 			RoiRegBuffer[12] = FPGA_REG_A5_ROW_COUNT;
  242.  
  243. 			RoiRegData[12]	= PostRoiRows;
  244.  
  245. 			RoiRegBuffer[13] = FPGA_REG_A5_VBINNING;
  246.  
  247. 			RoiRegData[13]	= PostRoiVBinning;
  248.  
  249. 		}
  250.  
  251. 		else
  252.  
  253. 		{
  254.  
  255. 			if ( PreRoiRows > 70 )
  256.  
  257. 			{
  258.  
  259. 				RoiRegBuffer[4] = FPGA_REG_A1_ROW_COUNT;
  260.  
  261. 				RoiRegData[4]	= 1;
  262.  
  263. 				RoiRegBuffer[5] = FPGA_REG_A1_VBINNING;
  264.  
  265. 				RoiRegData[5]	= (PreRoiRows-70);
  266.  
  267.  
  268.  
  269. 				RoiRegBuffer[6] = FPGA_REG_A2_ROW_COUNT;
  270.  
  271. 				RoiRegData[6]	= 70;
  272.  
  273. 				RoiRegBuffer[7] = FPGA_REG_A2_VBINNING;
  274.  
  275. 				RoiRegData[7]	= 1;
  276.  
  277. 			}
  278.  
  279. 			else
  280.  
  281. 			{
  282.  
  283. 				RoiRegBuffer[4] = FPGA_REG_A1_ROW_COUNT;
  284.  
  285. 				RoiRegData[4]	= 0;
  286.  
  287. 				RoiRegBuffer[5] = FPGA_REG_A1_VBINNING;
  288.  
  289. 				RoiRegData[5]	= 0;
  290.  
  291.  
  292.  
  293. 				RoiRegBuffer[6] = FPGA_REG_A2_ROW_COUNT;
  294.  
  295. 				RoiRegData[6]	= PreRoiRows;
  296.  
  297. 				RoiRegBuffer[7] = FPGA_REG_A2_VBINNING;
  298.  
  299. 				RoiRegData[7]	= PreRoiVBinning;
  300.  
  301. 			}
  302.  
  303.  
  304.  
  305. 			RoiRegBuffer[8] = FPGA_REG_A3_ROW_COUNT;
  306.  
  307. 			RoiRegData[8]	= m_pvtRoiPixelsV;
  308.  
  309. 			RoiRegBuffer[9] = FPGA_REG_A3_VBINNING;
  310.  
  311. 			RoiRegData[9]	= (m_pvtRoiBinningV | FPGA_BIT_ARRAY_DIGITIZE);
  312.  
  313.  
  314.  
  315. 			if ( PostRoiRows > 70 )
  316.  
  317. 			{
  318.  
  319. 				RoiRegBuffer[10] = FPGA_REG_A4_ROW_COUNT;
  320.  
  321. 				RoiRegData[10]	= 1;
  322.  
  323. 				RoiRegBuffer[11] = FPGA_REG_A4_VBINNING;
  324.  
  325. 				RoiRegData[11]	= (PostRoiRows-70);
  326.  
  327.  
  328.  
  329. 				RoiRegBuffer[12] = FPGA_REG_A5_ROW_COUNT;
  330.  
  331. 				RoiRegData[12]	= 70;
  332.  
  333. 				RoiRegBuffer[13] = FPGA_REG_A5_VBINNING;
  334.  
  335. 				RoiRegData[13]	= 1;
  336.  
  337. 			}
  338.  
  339. 			else
  340.  
  341. 			{
  342.  
  343. 				RoiRegBuffer[10] = FPGA_REG_A4_ROW_COUNT;
  344.  
  345. 				RoiRegData[10]	= 0;
  346.  
  347. 				RoiRegBuffer[11] = FPGA_REG_A4_VBINNING;
  348.  
  349. 				RoiRegData[11]	= 0;
  350.  
  351.  
  352.  
  353. 				RoiRegBuffer[12] = FPGA_REG_A5_ROW_COUNT;
  354.  
  355. 				RoiRegData[12]	= PostRoiRows;
  356.  
  357. 				RoiRegBuffer[13] = FPGA_REG_A5_VBINNING;
  358.  
  359. 				RoiRegData[13]	= PostRoiVBinning;
  360.  
  361. 			}
  362.  
  363. 		}
  364.  
  365. 	}
  366.  
  367.  
  368.  
  369. 	// Issue the reset
  370.  
  371. 	RoiRegBuffer[14]	= FPGA_REG_COMMAND_B;
  372.  
  373. 	RoiRegData[14]		= FPGA_BIT_CMD_RESET;
  374.  
  375.  
  376.  
  377. 	// Send the instruction sequence to the camera
  378.  
  379. 	AltaDebugOutputString( "APOGEE.DLL - CApnCamera::Expose() -> Issue WriteMultiMRMD() for Exposure setup" );
  380.  
  381. 	WriteMultiMRMD( RoiRegBuffer, RoiRegData, 15 );
  382.  
  383.  
  384.  
  385. 	// Handle the IR PreFlash, if enabled
  386.  
  387. 	if ( m_pvtPreFlashEnable )
  388.  
  389. 	{
  390.  
  391. 		double strobeVal	= read_ShutterStrobePosition();
  392.  
  393. 		double preflashVal	= m_ApnSensorInfo->m_IRPreflashTime / 1000;	
  394.  
  395.  
  396.  
  397. 		// v22 only
  398.  
  399. 		preflashVal = 110/1000;
  400.  
  401.  
  402.  
  403. 		write_ShutterStrobePosition( preflashVal );
  404.  
  405.  
  406.  
  407. 		// set the preflash bit
  408.  
  409. 		Read( FPGA_REG_OP_B, RegVal );
  410.  
  411. 		RegVal |= FPGA_BIT_IR_PREFLASH_ENABLE;
  412.  
  413. 		Write( FPGA_REG_OP_B, RegVal );
  414.  
  415.  
  416.  
  417. 		// dark frame duration is based on our sensor's specified preflash time
  418.  
  419. 		TakeNoDataDarkExposure( preflashVal + 0.050 );
  420.  
  421.  
  422.  
  423. 		// set the preflash bit back to zero
  424.  
  425. 		Read( FPGA_REG_OP_B, RegVal );
  426.  
  427. 		RegVal &= ~FPGA_BIT_IR_PREFLASH_ENABLE;
  428.  
  429. 		Write( FPGA_REG_OP_B, RegVal );
  430.  
  431.  
  432.  
  433. 		// set our shutter strobe back
  434.  
  435. 		write_ShutterStrobePosition( strobeVal );
  436.  
  437.  
  438.  
  439. 		// Re-calculate the exposure time to program to the camera
  440.  
  441. 		ExpTime = ((unsigned long)(Duration / m_PlatformTimerResolution)) + m_PlatformTimerOffsetCount;
  442.  
  443.  
  444.  
  445. 		// reprogram the timer
  446.  
  447. 		Write( FPGA_REG_TIMER_LOWER, (unsigned short)(ExpTime & 0xFFFF));
  448.  
  449. 		ExpTime = ExpTime >> 16;
  450.  
  451. 		Write( FPGA_REG_TIMER_UPPER, (unsigned short)(ExpTime & 0xFFFF));
  452.  
  453.  
  454.  
  455. 		ResetSystemNoFlush();
  456.  
  457.  
  458.  
  459. 		// Send the instruction sequence to the camera
  460.  
  461. 		AltaDebugOutputString( "APOGEE.DLL - CApnCamera::Expose() -> Issue WriteMultiMRMD() for Exposure setup" );
  462.  
  463. 		WriteMultiMRMD( RoiRegBuffer, RoiRegData, 15 );
  464.  
  465. 	}
  466.  
  467.  
  468.  
  469. 	// Issue the flush for interlines, or if using the external shutter
  470.  
  471. 	if ( (m_ApnSensorInfo->m_InterlineCCD && m_pvtFastSequence) || 
  472.  
  473. 		 (m_pvtExternalShutter) || 
  474.  
  475. 		 (m_pvtTriggerNormalGroup) || (m_pvtTriggerTdiKineticsGroup) )
  476.  
  477. 	{
  478.  
  479. 		// Make absolutely certain that flushing starts first
  480.  
  481. 		// in order to use Progressive Scan/Ratio Mode
  482.  
  483. 		Write( FPGA_REG_COMMAND_A, FPGA_BIT_CMD_FLUSH );
  484.  
  485.  
  486.  
  487. 		for ( int i=0; i<2; i++ )
  488.  
  489. 		{
  490.  
  491. 			Write( FPGA_REG_SCRATCH, 0x8086 );
  492.  
  493. 			Write( FPGA_REG_SCRATCH, 0x8088 );
  494.  
  495. 		}
  496.  
  497. 	}
  498.  
  499.  
  500.  
  501. 	m_pvtExposureExternalShutter = m_pvtExternalShutter;
  502.  
  503.  
  504.  
  505. 	IssueExposeCommand( Light );
  506.  
  507.  
  508.  
  509. 	// Set our flags to mark the start of a new exposure
  510.  
  511. 	m_pvtImageInProgress = true;
  512.  
  513. 	m_pvtImageReady		 = false;
  514.  
  515.  
  516.  
  517. 	// Debug output for leaving this function
  518.  
  519. 	sprintf( szOutputText, "APOGEE.DLL - CApnCamera::Expose( Duration = %f, Light = %d ) -> END", Duration, Light );
  520.  
  521. 	AltaDebugOutputString( szOutputText );
  522.  
  523.  
  524.  
  525. 	return true;
  526.  
  527. }
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ourcode.cpp
Qt Code: 
  1. #include <string.h>
  2. #include <stdio.h>
  3. #include <stdlib.h>
  4. #include"fitsio.h"
  5. #include<math.h>
  6. #include <unistd.h>
  7. #include <time.h>
  8. #include"tcl.h"
  9. #include"ApnCamera.h"
  10. double a;
  11. bool asd,cond;
  12.  
  13. namespace x
  14. {
  15.  CApnCamera *al=(CApnCamera *)new CApnCamera();
  16. };
  17.  
  18. int main(int argc,char **argv)
  19. {	
  20.         a=0.5;
  21. 	cond=true;
  22.         using namespace x;
  23.         al->Expose(a,cond);
  24. 	if(asd)
  25. 		printf("Initialized Properly");
  26. 	delete al;
  27. }
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When we execute we get the following error in Build Issues
/home/subhash/testing-build-desktop/../testing/main.cpp:31: error: undefined reference to `CApnCamera::Expose(double, bool)'
:: error: collect2: ld returned 1 exit status


And in compile output we get
main.o: In function `main':
/home/subhash/testing-build-desktop/../testing/main.cpp:31: undefined reference to `CApnCamera::Expose(double, bool)'
make: Leaving directory `/home/subhash/testing-build-desktop'
collect2: ld returned 1 exit status
make: *** [testing] Error 1
The process "/usr/bin/make" exited with code %2.
Error while building project testing (target: Desktop)
When executing build step 'Make'