Get the DLL string (memory allocated for DLL)
Hi, I'm aware there are a lot of discussions around this topic, but there are a lot of variations and I've never used before LabVIEW, and I seem to have a hard time at a very basic level, so I hope someone can help me with the below simple specific test case to put me on the right track before I pull my hair remaining.
I've created a DLL with a single function "GenerateGreeting". When it is called, it allocates enough memory for the string "Hello World!" \0"at the pGreeting of pointer, copy this string to the pointer and sets the GreetingLength parameter to the number of allocated bytes (in the DLL in the end, I want to use, there is a DLL function to free the memory allocated for this way).
I created a header file to go with the DLL containing the following line.
extern __declspec(dllimport) int __stdcall GenerateGreeting(char* &pGreeting, int &GreetingLength);
I then imported the LabVIEW file using the import Shared Library Wizard. That created a "generate Greeting.vi' and everything seems somewhat sensitive for me (although this does not mean a lot right now). When I run the vi, the ' GreetingLength on ' display correctly '13', the length of the string, but "pGreeting out" shows only three or four characters (which vary in each race), place of the string that is expected of junk.
The pGreeting parameter is set to the 'String' type, the string "String pointer C" format, size currently Minimum of 4095. I think the problem is that the DLL wants to allocate memory for pGreeting; the caller is supposed to pass a unallocated pointer and let the DLL allocates memory for the string the right amount, but LabVIEW expected the DLL to write in its buffer préallouée. How to with LabVIEW? Most of the functions in the DLL in the end, I want to use work this way, so I hope that's possible. Or I have to rewrite all my DLL functions to use buffers allocated by the appellant?
The vi , header and the DLL are atteched, tips appreciated. Edit - cannot attach the dll or the headers.
tony_si wrote:
extern __declspec(dllimport) int __stdcall GenerateGreeting(char* &pGreeting, int &GreetingLength);
Although char * & pGreeting is actually a thing of C++ (no C compiler I know would accept it) and this basically means that the char pointer is passed as a reference. So, technically, it's a double referenced pointer, however nothing in C++ Specifies that reference parameters should be implemented as a pointer at the hardware level. So free to decide to use some other possible MECHANISM that takes the target CPU architecture support a C compiler constructor. However, for the C++ compilers, I know it's really just syntactic sugar and is implemented internally as a pointer.
LabVIEW has no type of data that allows to configure this directly. You will have to configure it as a whole size pointer passed as a pointer value and then use a call MoveBlock() or the support VI GetValuePtr() to copy the data on the pointer in a string of LabVIEW.
AND: You need to know how the DLL allocates the pointer so that you can deallocate it correctly after each call to this function. Otherwise you probably create a leak memory, since you say that the first 4 bytes in the returned buffer always change, this feature seems to assign to each run of a new buffer that you want to deallocate correctly. Unless the DLL uses a Windows such as HeapAlloc() API function for this, it should also export a function according to deallocate the buffer. Functions like malloc() and free() from the C runtime cannot always be applied in the same version between the caller and callee, so that calling free() by calling on a buffer that has been allocated with malloc() in the DLL may not work on the same segment of memory and result in undefined behavior.
Tags: NI Software
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