add PdhLookupPerfIndexByName wrapper

bindings/java/src/jni/win32/pdh.c

@@ -430,6 +430,26 @@ JNIEXPORT jstring SIGAR_JNI(win32_Pdh_pdhLookupPerfName)
     }
 }
 
+JNIEXPORT jint SIGAR_JNI(win32_Pdh_pdhLookupPerfIndex)
+(JNIEnv *env, jclass cur, jstring jname)
+{
+    DWORD index;
+    LPCTSTR name =
+        JENV->GetStringChars(env, jname, NULL);
+    PDH_STATUS status =
+        PdhLookupPerfIndexByNameW(NULL, name, &index);
+
+    JENV->ReleaseStringChars(env, jname, name);
+
+    if (status == ERROR_SUCCESS) {
+        return index;
+    }
+    else {
+        win32_throw_exception(env, get_error_message(status));
+        return -1;
+    }
+}
+
 #ifdef __cplusplus
 }
 #endif

bindings/java/src/org/hyperic/sigar/win32/Pdh.java

@@ -253,6 +253,8 @@ public class Pdh extends Win32 {
         throws Win32Exception;
     private static final native String pdhLookupPerfName(int index)
         throws Win32Exception;
+    private static final native int pdhLookupPerfIndex(String name)
+        throws Win32Exception;
 
     /**
      * Main method for dumping the entire PDH