test.java

I always wanted to play around with JNI. This is my first attempt so I created a utility DLL called

/*

	This code is freeware please modify it! Use of
	this code is at you own risk.
*/



public class Test {
    // Load the dll that exports functions callable from java
    static {System.loadLibrary("TestImp");}
    
    // Imported function declarations
	public native void print(String msg);
	public native byte[] readFile(String path);
	public native int searchFile(String path, byte[] b, int bLength);
	public native String[] findFiles(String path, String mask);
	public native String[] checkProcess(String processName, boolean killIt, boolean printOutput);
	public native int startProcess(String commandLine, String workingDir);
	public native boolean waitForFileMask(String directrory, String fileMask);
	public native boolean waitForAnyFile(String directrory);
	
	public void Test() {
    }
 
	public static void main(String [] args) {
		Test t = new Test();

        // Printf example
		t.print("->Testing JNI - Hello from c++\n");

        // Loading a file as a byte array example
		System.out.println("->Dumping file test.java\n" + new String(t.readFile("test.java")));

        // Binary search for a byte array example
		String tmp = "//System.out.println";
		System.out.println("found \'" + tmp + "\' at " + t.searchFile("test.java", tmp.getBytes(), tmp.length()) + "\n\n");

        // Directory listing example
        System.out.println("Directory listing of C:\\projects\\code\\java\\*.*");
        String[] sa = t.findFiles("C:\\projects\\code\\java", "*.*");
        if(sa == null) {
            System.out.println("No files found");
            return;
        }
        int count = 0;
		for(int x = 0; x < sa.length; x++) {
            count++;
            System.out.println("->" + sa[x]);
        }
        System.out.println("->Found " + sa.length + " items");

        // Process list example
        System.out.println("\nchecking for all processes");
        String[] psAll = t.checkProcess(" ", false, false);
        if(psAll == null) {
            System.out.println("Error checking for all processes");
            return;
        } 
        for(int x = 0; x < psAll.length; x++) {
            System.out.println("->" + psAll[x]);
        }

        // Checking for a specific process example
        System.out.println("\nchecking for \'Explorer.exe\'");
        String[] ps = t.checkProcess("Explorer.exe", false, false);
        if(ps == null) {
            System.out.println("Error checking for \'Explorer.exe\' process");
            return;
        } 
        for(int x = 0; x < ps.length; x++) {
            System.out.println("->" + ps[x]);
        }

        // Terminating a process example
        System.out.println("\nkilling \'calc.exe\'");
        String[] psKill = t.checkProcess("calc.exe", true, false);
        if(psKill == null) {
            System.out.println("Error killing \'calc.exe\' process");
            return;
        }
        if((psKill[0].compareTo("calc.exe") == 0) && (psKill.length == 1))
        {
            System.out.println("Killed \'calc.exe\' process");
        }
        else
        {
            System.out.println("Error killing \'calc.exe\' process: not found");
        }    

        // Creating a process example
        System.out.println("\nStarting up notepad");
        int ret = 0;
        if((ret = t.startProcess("C:\\WINDOWS\\NOTEPAD.EXE", "c:\\")) == 0) {
             System.out.println("Started notepad");
        }
        else {
             System.out.println("Error " + ret + " starting notepad");
        }    

        // Waiting for a file mask example
        System.out.println("\nWaiting for a file");
        // Block - maybe wait forever!
        if(t.waitForFileMask("C:\\temp", "*.txt")) { 
             System.out.println("Found a file");
        }
        else {
             System.out.println("Error while waiting for a file");
        }

        // Waiting for any file example
        System.out.println("\nWaiting for any file");
        // Block - maybe wait forever!
        if(t.waitForAnyFile("C:\\temp")) {
             System.out.println("Found a file");
        }
        else {
             System.out.println("Error while waiting for a file");
        }
	}
	
}