Kadtronix USB HID

[bry0n]

Hello Everybody,

I am having some difficulty getting the Get List.vi to find the usb devices on my PC. It does not find any of my devices, and I suspect it may be with how I have the vi set up.

I think the problem lies with the struct data type:

 typedef struct {
    char         *DeviceName;   // Device name
    char         *Manufacturer; // Manufacturer
    char         *SerialNumber; // Serial number
    unsigned int VendorID;         // Vendor ID
    unsigned int ProductID;        // Product ID
    int          InputReportLen;   // Length of HID input report (bytes)
    int          OutputReportLen;  // Length of HID output report (bytes)
    int          Interface;        // Interface  
    int          Collection;       // Collection
   } mdeviceList2;

Any suggestions?

There are some demos at the bottom of the page located here, and where done in CVI and work fine:

http://www.kadtronix.com/usbhidapi.htm#Description

[rolfk]

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@bry0n wrote:

Hello Everybody,

I am having some difficulty getting the Get List.vi to find the usb devices on my PC. It does not find any of my devices, and I suspect it may be with how I have the vi set up.

I think the problem lies with the struct data type:

 typedef struct {
    char         *DeviceName;   // Device name
    char         *Manufacturer; // Manufacturer
    char         *SerialNumber; // Serial number
    unsigned int VendorID;         // Vendor ID
    unsigned int ProductID;        // Product ID
    int          InputReportLen;   // Length of HID input report (bytes)
    int          OutputReportLen;  // Length of HID output report (bytes)
    int          Interface;        // Interface  
    int          Collection;       // Collection
   } mdeviceList2;

Any suggestions?

There are some demos at the bottom of the page located here, and where done in CVI and work fine:

http://www.kadtronix.com/usbhidapi.htm#Description

---

Well!! The mdeviceList parameter is an array of mdeviceList2 records. You only pass a single record to the function. This can work if you always pass 1 for nMaxDevice but if you pass anything else you will most likely receive an error (if you pass 0) or cause a memory corruption (if you pass more than 1 and the function has more than one device to report).

[bry0n]

Thanks for the reply rolfk! I will give that a try.