dll function not working

[ramses64]

Hi all,
I'm trying to use dlls function, and one of them always returns 1 (error), and I don't know if i'm doing womething wrong.

the datasheet of the dll says :

Prototype: int WINAPI rf_M1_authentication2 ( unsigned short icdev,

unsigned char model,

unsigned char block,

unsigned char *pKey)

Parameter: icdev: [IN] Device ID

model: [IN] key validate mode

block: [IN] block absolute address

pKey: [IN]

6 bytes password

Return: return 0 if successful

Explanation:model = 0x60: via KeyA

model = 0x61: via KeyB

The prototype of my function is :

int32_t rf_M1_authentication2(uint8_t icdev, uint8_t model, uint8_t block, uint8_t *pKey);

Any idea ?

Thanks,

[nathand]

A short int is usually 16 bits (2 bytes), not a U8.  Can you share your LabVIEW code demonstrating how you're calling the DLL?

[ramses64]

Hi,

thanks for your reply, yes it is an U16.  this is my code :

I joined the dll (renamed in .txt.)

[ramses64]

P.S. The VB code (which works) is :

state = rf_init_com(3,115200);

WORD icdev = 0x0000;

unsignedchar mode = 0x60;

unsignedchar secnr = 0x00;

// int state;

CString strKey;

unsignedchar pData[MAX_RF_BUFFER];

unsignedchar cLen;

　

strKey ="ÿÿÿÿÿÿ";

secnr = 0;

state = rf_M1_authentication2(icdev,mode,(secnr/4)*4,(unsignedchar*)strKey.GetBuffer(strKey.GetLength()));

state = rf_M1_read(icdev,secnr,pData,&cLen);

rf_ClosePort();

[smercurio_fc]

You said one of the them always returns a 1. Which one? I don't know if this makes any difference in your specific case, but the baud rate in your LabVIEW code does not match the baud rate in the VB code.

[ramses64]

Hi,

it's of course the  rf_M1_authentication2 function.

I tried with others comunucation speeds, but this doesn't change anything...

[nyc_(is_out_of_here)]

http://www.ni.com/white-paper/4877/en#toc4

may be useful

[ramses64]

Hi,

[ramses64 · Accepted solution]

Hi,

I finally found the solution by using Labview calls to place my array in a memory area, and transmit the pointer to my dll. Here is the code :

Thanks to all !