Need a bit of help with the string read/write DLL

I have a DLL that communicates via RS232 with some instruments.

From 2 numbers (parameter number and a number of processes) the DLL will communicate and extract the values.

I managed to put in place the DLL to get words, characters, long and floats (single precision).

Now, it is the documentation that accompanies it for strings:

ReadString asks the DLL to get the data of the instrument, if succesfull I have others on call GetString to get the string memory.

I have a few questions:

-The values of her star (*) are pointers; As I understand it that it points to a place of memory where the value is stored, is - that correct?

-How do I know if I pass the value to the DLL, or read? For example with GetString Im not sure if

I should pass the length of the string to the DLL or if it is read

-How to get the character returned in a string; IM assuming I need to find somewhere a byte array.

Now I can also write strings:

As a matter of f:

-Should I add NULL at the end of the string, or labview does by default?

My procedure is now: read the input chain, reduce it to the size of the specified string (this is constant according to the setting of the instrument), converted to a byte array and replace the last element of the array with 0 (Null).

However, the DLL entry expected a character, that I should get in the DLL?

_Faust wrote:

I have a few questions:

-The values of her star (*) are pointers; As I understand it that it points to a place of memory where the value is stored, is - that correct?

They can be pointers or buffers. Which of the two is ambiguous in the syntax of C. However, in your case I suppose that piMsgId and pcLen be a pointer to a unique value and pszDest a string buffer.

-How do I know if I pass the value to the DLL, or read? For example with GetString Im not sure if

I should pass the length of the string to the DLL or if it is read

Description is not really clear however most of the C API require today the length of the allocated buffer at the entrance to make sure that they don't overrun the buffer length. They may or may not change this value before returning to indicate the amount of data they actually informed. The pcLen parameter passed by reference probably indicates that this function does this way.

-How to get the character returned in a string; IM assuming I need to find somewhere a byte array.

It is not necessary. You can simply set the parameter to a string and must be passed as a C string pointer. In LabVIEW 8.5 or more you can also configure to resize this string for the number of characters as indicates it a different setting of the library to compose the node (CLN), in this case your pcLen. 8.5 you can use a table to explicitedly initialization function create a table Bbyte of the length needed, convert the byte array to string and pass to the CLN parameter. LabVIEW will return automatically only the part of the string up to the NULL character if a CLN is configured as C string pointer

Now I can also write strings:

As a matter of f:

-Should I add NULL at the end of the string, or labview does by default?

No! If you configure the parameter is a string, passed as a string pointer C, LabVIEW will do it automatically for you.

My procedure is now: read the input chain, reduce it to the size of the specified string (this is constant according to the setting of the instrument), converted to a byte array and replace the last element of the array with 0 (Null).

However, the DLL entry expected a character, that I should get in the DLL?

Tags: NI Software

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