An api imported USB does not work correctly

Hello everyone,

I am currently using LabVIEW to communicate with a USB device and I had to import an api USB I bought. With VC ++ this api works well, but LabVIEW has its problems.

First of all, I imported through Tools > Import > Library (DLL), chose the DLL and the corresponding and any Headerfile which worked without problems. Now I got my 14 VI, one for each function declared in the DLL.

It is, most of these functions will not properly work, or maybe I just don't understand their right or give them the wrong settings. I will attach a screenshot of the 'GetList.vi', which should return a list of all connected USB devices.

My guess is that the defined pList could be a problem because it must contain the char, int etc but as you can see in the screenshot, contains only numbers.

Any help would be greatly appreciated!

Kind regards

Pedro

EDIT: Here's the description of the documentation of the api USB GetList method:

GetList)
This function searches the system for USB HID devices and generates a list of these devices and their availability. The caller must provide a pointer to a buffer that will contain the list of entries of the structure. Must also provide an integer representing the maximum number. entries may contain the buffer. Returns the total number stored.

int CUsbHidApi::GetList)
unsigned int VendorID,
unsigned int ProductID,
char * manufacturer.
char * SerialNum,.
char * DeviceName,.
mdeviceList * pList.
(int nMaxDevices);

Description of the settings:

VendorID / / Vendor ID search (0xffff if not used)
ProductID / / product ID of research (0xffff if not used)
Constructor / / manufacturer (NULL if not used)
SerialNum / / serial number to search for (NULL if not used)
DeviceName / / name of the search tool (NULL if not used)
pList / / table of the appellant for the storage devices
nMaxDevices / / size of the ArrayList to the appellant (no.entries)

smercurio_fc wrote:

When I posted response you has not yet posted any header file, so I did not see the header that you posted 2 minutes after my answer. In view of the header, you should be able to call these functions. However, the pList parameter is a pointer to a structure that contains variable length strings. This isn't something that you can easily manage, and such a question was discussed several times on this forum. When you get to this level of complexity in terms of parameter data types, you will need to write a wrapper DLL so that the types of data between LabVIEW and the DLL are simple data types only.

In fact the code created byt the library import wizard handles pointers of varying sizes correctly for an item in the structure, so nMaxDevices must never be placed in anything else but 1.

It is also not entirely clear if manufacturer, DeviceName and SerialNum always are inputs to the function or not, but I guess they are. A problem here is that the DLL function expects a NULL pointer if it must ignore the string parameter according and not only a string empty, so you will probably need to create call several nodes of the library with the configuration of the various parameters to ignore one or more of these settings.

The data type of mDeviceList which had been initially used by the library with a fixed size of embedded strings would have been a little bit more efficient to implement in LabVIEW but always a PITA too.

I can only recognize smercurios statement that this type of API is absolutely better managed with a wrapper DLL. While it is not impossible to do it entirely in LabVIEW, it is more than the import library Wizard can eventually handle automatically and doesn't require so some stunts of advanced in the LabVIEW diagram memory pointer that must be done manually. Something which is not really run by a person without some serious C programming knowledge, but this person is clearly going for the wrapper DLL solution because it is much easier to manage than to do everything in a LabVIEW diagram by hand.

Tags: NI Software

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