FingerPrint API

From wizarPOS
Revision as of 07:06, 19 April 2018 by Mahong (talk | contribs)

Functions

When the third party application to use these apis, it must creat its' store space to store the fingerpirnts. The apis are some utility methods.

open

int fp_open()

Open the fingerprint.

Parameters

Returns

The result code, >= 0, success; <0 error code.

close

 int fp_close()

Close the fingerprint device. The open and close apis are pair operations. If you don’t want to use this device, you should call the close api to release this device.

Parameters

Returns

The result code, >= 0, success; <0 error code.

get_fea

 int fp_get_fea(unsigned char *pFeaBuffer, int nFeaLength, int *pRealFeaLength, int n_TimeOut_S)

Get the feature of fingerprint. When the finger touch the fingerprint device, the feature of the fingerprint will be return. Parameters

pFeaBuffer char * The buffer to store the feature, not null
nFeaLength int The length of the buffer
pRealFeaLength int * Reture the real length of the buffer
nTimeOut_S int Timeout, unit of time:s

Returns

The result code, >= 0, success; <0 error code.

getLastImage

 int fp_getLastImage(unsigned char *pImgBuffer,int nImgLength, int *pRealImaLength, int *pImgWidth, int *pImgHeight)

Get the image of fingerprint. When the finger touch the fingerprint device, the image of the fingerprint will be return.


Parameters

pImgBuffer char * The image buffer
nImgLength int The length of image buffer
pRealImaLength int * The real length of the image buffer
pImgWidth int * The width of the image
pImgHeight int * The height of the image

Returns

The result code, >= 0, success; <0 error code.

match

 int fp_match(unsigned char *pFeaBuffer1, int nFea1Length, unsigned char *pFealBuffer2, int nFea2Length)

Match the fingerprint. Input the two feature of the fingerprint, it will get the result of match .

Parameters

pFeaBuffer1 char * The feature of the old fingerprint
nFea1Length int The length of the feature
pFeaBuffer2 char * The feature of the new fingerprint
nFea2Lenghth int The length of the feature

Returns

The result code, >= 0, success; <0 error code.

cancel

 int fp_cancel ()

Cancel the fingerprint device operation.


Parameters

Returns

The result code, >= 0, success; <0 error code.