CALL dll STRUCT

[小_羊]

I have a dll，Function parameter define as follow

typedef struct 
{
uint32_t LocId;
uint32_t EESize;

uint8_t SerialNumber[64];
uint8_t Description[4096];
const char* FileInfo;
} IoData_t;

I try the attach picture method, at run program then labview crash.

what can I do for solve this probram

Looking forward to your advice, thanks!!!!

[MichaelBalzer]

I suspect you need to allocate the memory for the const char* FileInfo parameter. At the moment you're passing in a value of 0. The dll function will then try to de-refence that (invalid) memory location, causing the crash. Instead you should allocate some memory and pass that into the function for the FileInfo parameter. See this knowledge base article (under the Additional Information section) for details: https://knowledge.ni.com/KnowledgeArticleDetails?id=kA00Z000000P6tcSAC

[小_羊]

Thanks!!!

my problem is the struct's array

dll function declaration

   uint8_t SerialNumber[64]
   uint8_t Description[4096]
In labview I try use U8 array and size is 64, U8 array and size is 4096,then labview crash

In labview I try use cluster include 64 u8 element, cluster include 4096 u8 element then labview could run and receive dll's result

but use cluster include 4096 u8 element is very hard, so use array in cluster can complete this work?

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[zou]

> but use cluster include 4096 u8 element is very hard

Why?