java - JNI what types can I use instead of given (unsigned int, const char*, const wchar_t*, .... ) -

stackoverflow users !

i trying covert functions had written in c++ java. have .so library witch have written in c++ , must call functions android application. functions this:

unsignd int uninitialize(); --------------------------------------- unsignd int deviceopen(     const wchar_t* deviceid,     unsigned long* phdevice); --------------------------------------- typedef struct blobdata_s {      unsigned long     length;      unsigned char     data[1]; } dsmblobdata_t;  unsignd int enroll(     unsigned long       hdevice,     const char*         userid,     blobdata_s*         pinputinfo,     void*               puserdata); 

now how can see have functions , typedefs want write in java style, problem there no unsigned int java type (link). knew instead of int can use jint, instead of char* can use jchar* must with

• const wchar_t*
• unsigned long
• unsigned char

what can use instead of types.

i try in way

jint java_com_example_testapp_testapp_deviceopen( jchar* deviceid, int* phdevice) {        return deviceopen((const wchar_t*)deviceid, (unsigned long*)phdevice); } 

am right ?*

thanks in advance, vitobrothers.

for starters, you'll have map types java types. say, there no unsigned in java, , no wchar_t. once you've decided types use on java side (e.g. int instead of unsigned, or maybe long; , java.lang.string both char* , wchar_t*), you'll have declare native methods using them, , implement jni in way maps them internal values.

also, if c++ code uses exceptions, you'll have catch them , remap them in jni interface.

for starters, i'd see if existing tool, swig, job. if didn't, i'd still use example code, can copy/pasted , edited.