LabWindows/CVI can not append usb pipe path?

[ccchen]

Dear All,

I have a small problem in Labwindows CVI. I'm developing a system and need to use USB.

When I trying to copy the device path from SP_INTERFACE_DEVICE_DETAIL_DATA (Null terminated string). Why I couldn't use strcpy(pDeviceDetail->DevicePath0) or  strlen(pDeviceDetail->DevicePath) function?
( Error message >> "missing terminating null in string argument") , The problem didn't exist in VC++,   Why ?

Thanks.

ccchen 

[AlexandreChen]

Hello ccchen,

     Have you ever try to add an null terminatior? You could try

     to insert one to see if it works. If possible, could you show

     some part of your code so we can have more detail to look

     into your problem? Thanks for your help.

     Best Regards,

     Alexander Chen,

     Applications Engineer, National Instruments Taiwan

[ccchen]

Hi Alexander,

   1. I have try to add "null" , but no use.

   2. Here is my test software , please help me to solve this issue. Thanks.

(ps , If possible, can we disscuss this issue in th tel?)

BR//

ccchen

int get_usb_device()
{   
    SP_INTERFACE_DEVICE_DATA                   interfaceDev;
    SP_INTERFACE_DEVICE_DETAIL_DATA    *pDeviceDetail;
    DWORD dwSize,dwSizeA;
    //
    GUID guid = { 0x652a5694 ,0x8a69, 0x42b9, { 0x98, 0x2f, 0x8c, 0x65, 0xd8, 0x06, 0xeb, 0x85 } };  // = GUID
    HDEVINFO hDev; 
    int pathlen;
    char *devName = "\n"; 
     // 
     hDev = SetupDiGetClassDevs ( &guid, NULL, NULL, DIGCF_PRESENT|DIGCF_DEVICEINTERFACE );   
     //
     interfaceDev.cbSize = sizeof(interfaceDev);   // interfaceDev.cbSize = 28   
     if(!SetupDiEnumDeviceInterfaces  (hDev, NULL, &guid, 0, &interfaceDev))//interfaceDev=0x652a5694,0x8a69,0x42b9, 0x98,0x2f,0x8c,0x65,0xd8, 0x06, 0xeb, 0x85
               return 1;   
     // 
     if( SetupDiGetDeviceInterfaceDetail ( hDev, &interfaceDev, NULL, 0, &dwSize, NULL))  // dwSize = 83
              return 1;
     // 
     pDeviceDetail                =       ( SP_DEVICE_INTERFACE_DETAIL_DATA *)malloc(dwSize+5);         
     pDeviceDetail->cbSize = sizeof( SP_INTERFACE_DEVICE_DETAIL_DATA);
     //
     if(pDeviceDetail == NULL)
     {     SetupDiDestroyDeviceInfoList(hDev);
            return 1;
     }
     dwSizeA = dwSize;
     if(!SetupDiGetDeviceInterfaceDetail ( hDev, &interfaceDev, pDeviceDetail, dwSizeA, &dwSize, NULL))
         return 1;         //  "pDeviceDetail" data in memory are : 05 00 00 00 5c 5c 3f 5c 75 73 62 23 76 69 64 5f 30 34 ........ 
                                                                                  //         ASCII  =              \   \   ?   \    u   s   b   #   v   i     d  _   0   4  .....
    //  
    pathlen = strlen (pDeviceDetail->DevicePath);  //  >> Fail here !! ( Error message >> "missing terminating null in string argument") 
    strcat (pDeviceDetail->DevicePath, "\\");           //  >> Fail here !! ( Error message >> "missing terminating null in string argument")   
    strcpy  ( devName,pDeviceDetail->DevicePath) ; 
  
     printf( "Attempting to open %s\n", devName );  
   return 0;
}

[AlexandreChen]

Hello ccchen,

   Thanks for your kindly supplying the source code. Sorry that I am not familiar with

   USB programming, so I can only try to compile your code but I don't know how to

   build a complete application. Currently I can compile without error. Do you encounter

   such error under compile process? Or in the build process? If possible, could you please

   provide a complete CVI project so that we can try to debug in our side?

   Also, are you using CVI 3.1 or later? If you are using previous version, you may encounter

   such problem. The following link describe such error.

   http://digital.ni.com/public.nsf/allkb/AAD4D09DAAB8C6E6862561D6005B7D1B

   If you like to contact us via phone, you can call 02-2377222-3 for technial support.

  Best Regards,

  Alexander Chen

  AE NITW

[ccchen]

Hi Alexander,

Thank you for your feedback & support. I have already solved this issue last night. Thanks again.

( My CVI version is v7.11) 

BR//

ccchen