Function call to the C - Type not available library for one of the parameters in the Prototype of the function.

Hello

I do a work already done by others: implementation of a Wrapper to SQLite LabVIEW, I know how to do with .NET alas I would do that c, mainly for purposes of performance and my pointer poor knowledge is kinda make me stuck.

Some information is kindly provided here:

What I want to do is just to open a connection to an SQLite database (if not existing does not, the SQLite engine will create the embedded database and the corresponding file to save the data and everything). The function to perform the operation is indicated in the page below:

http://www.SQLite.org/c3ref/open.html

It seems simple enough:

int sqlite3_open(
  const char *filename,   /* Database filename (UTF-8) */
  sqlite3 **ppDb          /* OUT: SQLite db handle */
);
int sqlite3_open16(
  const void *filename,   /* Database filename (UTF-16) */
  sqlite3 **ppDb          /* OUT: SQLite db handle */
);
int sqlite3_open_v2(
  const char *filename,   /* Database filename (UTF-8) */
  sqlite3 **ppDb,         /* OUT: SQLite db handle */
  int flags,              /* Flags */
  const char *zVfs        /* Name of VFS module to use */
);

However, I'm struggling a bit on the following type:

sqlite3 **ppDb          /* OUT: SQLite db handle */

And I'm not really sure what type to use when calling this function of LabVIEW

Any idea, I guess it's really easy, but I'm not really used to have a type which is I guess the DataInstance but as it is not clearly explicted in the C library function prototype interpreted LabVIEW (InstanceDataType is logical but not sure if) I'm not really sure what I show in the screenshot is valid or not.

My VI seems to work like a charm, but am not sure if I'm doing something wrong.

Another prototype that I have no idea on the appeal proper LabVIEW is the close function:

http://www.SQLite.org/c3ref/close.html

I would like to get this straight, usually a parameter has a name, right? but seems not:

int sqlite3_close(sqlite3*);
int sqlite3_close_v2(sqlite3*);

Similarly no idea about setting up for this one... must be regarded as the free forum like the one calling this function is... but I don't send any object?

Really confusing...

sqlite3*

I might sound really stupid, but if someone could point me to a few tracks, I'd be really grateful for that.

Thank you

Ehouarn wrote:

However, I'm struggling a bit on the following type:
sqlite3 **ppDb          /* OUT: SQLite db handle */
And I'm not really sure what type to use when calling this function of LabVIEW

This parameter must be an integer of size pointer, passed by the pointer. No matter whether it was signed or not signed. The SQLite library will allocate memory for you, then put a pointer to this memory in full the pointer location as you go.

Regarding the close function, you must pass the same integer pointer, but this time he passed by value (because it is referenced with a single *, not two). There is nothing wrong with the documentation by omitting the name of the parameter. For the application of a function prototype, the parameter name is without important, since everything you need to know is the type of data. How the service chooses to refer to this setting internally is irrelevant.

Tags: NI Software

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Function call to the C - Type not available library for one of the parameters in the Prototype of the function.

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