Implement Java and C language interfaces

Step 1: declare local variables
<CCID_NOBR>
<CCID_CODE> Example: class NativeHello {
Public native void nativeHelloWorld ();
Static {
System. loodlibrary ("nativeTest"); // call the nativeTest. dll library file
}
} </CCID_CODE> </CCID_NOBR>
Step 2: generate the header file
Use javac to compile NativeHello. java and javah to generate the c header file. H file.
Step 3: generate the root file
The command is as follows: javah-stubs NativeHello (generate the NativeHello. c file)
Step 4: compile the C program (assuming the file name is NativeTest. c)
<CCID_NOBR>
<CCID_CODE> # include <stdio. h>
# Include <NativeHello. h> // indicates the. h file generated in step 2.
# Include <stubpreamble. h> // indicates the file under JDK include.
Void Nativehello_nativeHelloWorld (struct HNativeHello * this ){
.........
}/</CCID_CODE> </CCID_NOBR>
* The function name Nativehello_nativeHelloWorld cannot be specified arbitrarily. You can find it from the header file generated by javah. You can also use the following method to name it: class name_local method name (struct H class name * this )*/
Step 5: compile the DLL file
Compile nativeTest. c and NativeHello. c into a DLL library file with the same name as the file in System. loodlibrary ("nativeTest").
Finally, let's talk about the test method. The source file is as follows:
<CCID_NOBR>
<CCID_CODE> class UseNative {
Public static void main (String [] args ){
NativeHello nh = new NativeHello ();
Nh. nativeHelloWorld ();
}
} </CCID_CODE> </CCID_NOBR>