C interface Funtcion cannot write an array to Labview

Hi
I have developed an vi in labview2012, and used the C Interface to convert the vi into api which can be used in Labwindows\CVI.
However, when I use the function NiFpga_WriteArrayU8, I cannot transport the array to labview. Can anyone help me?
I use the funtion in this way:
NiFpga_WriteArrayU8(session,NiFpga_Card4_SPI_ControlArrayU8_ArrayTx_SPI1, WriteData,1)
NiFpga_Card4_SPI_ControlArrayU8_ArrayTx_SPI1 is the control ID in Labview
WriteData is an pointer which point to an unsigned char array .
Looking forward for reply.
michael

Is there anyone who can help me ?

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C interface Funtcion cannot write an array to Labview

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