rahimp

Thanks for your help Adam. I tried what you suggested and things seem to be working out just fine! I have to go through my c++ code and convert some things to pointers in order to complete the integration. I have one question though, is it possible to send decimal LabVIEW strings into functions in my DLL which accept char *? Basically are LabVIEW strings compatible with C++ or do I have to manipulate the strings in order to put them into an acceptable format before sending to my DLL functions? Thanks, Rahim

QUOTE(Adam Kemp @ Mar 20 2007, 05:56 PM) I dont need to interpret the data in LabVIEW. I just need to declare a pointer to the data in LabVIEW and then allocate memory for it in c++ and then pass it back into LabVIEW. From there I will be passing the pointer back to the subsequent c++ dll calls. What I'm still confused about is what I would initially pass into the dll. For example if my function is as follows: void allocateMPEG4 (CMPEG4Streaming *testvariable) { testvariable = new CMPEG4Streaming(); } Then I would initially need to send pointer testvariable into the function from LabVIEW. Would I simply send in an unsigned 32 bit int? What sort of data type should I be sending into the call library function node? As well on the receiving side of the call library function would I just set the following: Parameter: arg1 Type: numeric Data Type: Unsigned 32-bit Integer Pass: Pointer to Value Or would this configuration be better on the receiving end: Parameter: arg1 Type: Adapt to Type Data Format: Handles by Value Ideally I'd want my function in C++ to be as follows: CMPEG4Streaming *allocateMPEG4 (void) { CMPEG4Streaming *testvariable = new CMPEG4Streaming(); return testvariable; } Is it at all possible to use the funciton return so that I do not have to send anything in from LabVIEW? Thanks,

Hello All, I'm looking to use some c++ code in my labview application using the call function library function. I have a class in C++ which is a custom data type. I need to send this variable into my c++ functions. I want to allocate memory for it inside one of my dll functions and pass a pointer to it back to labview. I want to use this pointer to pass through to all my subsequent functions requiring the pointer. I have been looking online for support for custom data types in labview dlls and cannot seem to find any acceptable solutions. I have attached the C++ code for my data type below. Any help will be greatly appreciated. #include "wmsdk.h" #include "wmsysprf.h" #include "mil.h" #include "stdio.h" #include "conio.h" #include <assert.h> class CMPEG4Streaming { public: CMPEG4Streaming(); ~CMPEG4Streaming(); bool SetStreamingParameters( int PortNum, const WCHAR * ArchiveFile, int VideoSizeX, int VideoSizeY, int AvgTimePerFrame, int RateControl); inline int GetStreamingVideoSizeX(){ return m_VideoSizeX;} inline int GetStreamingVideoSizeY(){ return m_VideoSizeY;} bool StreamSample( void *DataPtr, int NumBytes, bool IsIFrame, unsigned long long cnsSampleTime); private: //We have 1 profile manager, and then 1 profile PER Stream static IWMProfileManager *m_pProfileMgr; static int CMPEG4StreamingInstanceCount; IWMProfile *m_pProfile; IWMWriter *m_pWriter; IWMWriterAdvanced *m_pWriterAdvanced3; IWMWriterNetworkSink *m_pWriterNetworkSink; IWMWriterFileSink *m_pWriterFileSink; int m_FirstIFrame; DWORD m_PortNum; const WCHAR * m_ArchiveFile; int m_VideoSizeX; int m_VideoSizeY; //int m_VideoFormat; //int m_VideoResolution; void PrintErrorMessage( char *, HRESULT); HRESULT CreateProfile( int PortNum, const WCHAR * ArchiveFile, int VideoSizeX, int VideoSizeY, int AvgTimePerFrame, int RateControl); HRESULT ModifyProfile( int PortNum, const WCHAR * ArchiveFile, int VideoSizeX, int VideoSizeY, int AvgTimePerFrame, int RateControl); HRESULT FillConfig ( IWMStreamConfig *pConfig, int VideoSizeX, int VideoSizeY, int AvgTimePerFrame, int RateControl); HRESULT SetSinks ( unsigned long PortNum, const WCHAR * ArchiveFile); }; Basically I need to be able to get a pointer to CMPEG4Streaming inside labview by allocating memory for it in my c++ dll. My dll function would be something like this: void allocateMPEG4 (CMPEG4Streaming *testvariable) { testvariable = new CMPEG4Streaming(); } I would then pass the pointer returned in labview to all my subsequent functions in the dll. Thanks!