JNI and SetWindowsHookE x Callback not being called?

[KWhat4]

I seem to have an issue that I cant resolve. I have a jni dll that
calls SetWindowsHookE x with a callback to HookKeyboardPro c (basically
a real simple global keyboard hook). Now the dll almost works all the
jni hooks are fine and the program appears to run but the callback
(HookKeyboardPr oc) does not seem to get executed or possibly never
returns from execution. The code is as follows. None of the
variables being set in the code actually get set so im not sure what i
botched. The hook does complete successfully as it returns non-null
value for hkb. I would appreciate any help or suggestions on where to
get help.

Thanks

// syshook.cpp
/*
* SysHook - 7/17/05
* Jacob Gohlke
*
* JNI Interface for setting a Keyboard Hook and monitoring
* it Java-side
*
* (c) Copyright 2005 Jacob Gohlke
*
* Feel free to use and learn from this code, royalty-free!
* I only ask you acknkowlege what library you are using
* and who made it. Thanks, and happy hooking!
*/

#include <windows.h>
#include <winuser.h>
#include <jni.h>
#include <stdio.h>
#include <stdlib.h>
#include "org_dotnative_ globalkeylisten er_PollThread.h "

//#pragma data_seg(".HOOK DATA") //Shared data among all instances.
//#pragma data_seg("Share d")
static HHOOK hkb = NULL;
static HANDLE g_hModule = NULL;
static WPARAM g_wParam = 0;
static LPARAM g_lParam = 0;
static bool test = FALSE;

//extern "C" {
JNIEXPORT void NotifyJava(JNIE nv *env, jobject obj) {
jclass cls = env->GetObjectClass (obj);
jmethodID mid;

mid = env->GetMethodID(cl s, "Callback", "(ZIZZ)V");
if (mid == NULL) {
return;
}

if( (HIWORD( g_lParam ) & KF_UP) ) {
env->CallVoidMethod (obj, mid, (jboolean)FALSE , (jint)(g_wParam ),
(jboolean)(HIWO RD( g_lParam ) & KF_ALTDOWN), (jboolean)
(HIWORD( g_lParam ) & KF_EXTENDED));
}
else {
env->CallVoidMethod (obj, mid, (jboolean)TRUE, (jint)(g_wParam ),
(jboolean)(HIWO RD( g_lParam ) & KF_ALTDOWN), (jboolean)
(HIWORD( g_lParam ) & KF_EXTENDED));
}
}

//#pragma data_seg()
//#pragma comment(linker, "/SECTION:.HOOKDA TA,RWS")

LRESULT CALLBACK HookKeyboardPro c(INT nCode, WPARAM wParam, LPARAM
lParam) {
//printf("Callbac k\n");
test = TRUE;
if (nCode < 0) {
// do not process message
return CallNextHookEx( hkb, nCode, wParam, lParam);
}

g_wParam = wParam;
g_lParam = lParam;

return CallNextHookEx( hkb, nCode, wParam, lParam);
}

JNIEXPORT void JNICALL
Java_org_dotnat ive_globalkeyli stener_PollThre ad_checkKeyboar dChanges(JNIEnv
*env, jobject obj) {
if (test) {
printf("%i %i\n", g_wParam, g_lParam);
}
if(g_wParam != 0 && g_lParam != 0) {
NotifyJava(env, obj);
g_wParam = 0;
g_lParam = 0;
}
}

static void Init() {
hkb = SetWindowsHookE x(WH_KEYBOARD, (HOOKPROC)HookK eyboardProc,
(HINSTANCE)g_hM odule, 0);
printf("Call Init\n");
}

static void Cleanup() {
if (hkb != NULL) {
printf("Call Unhook\n");
UnhookWindowsHo okEx( hkb );
}

hkb = NULL;
printf("Call Clean\n");
}
//BOOL APIENTRY
//extern "C" BOOL WINAPI DllMain(HANDLE hModule, DWORD
ul_reason_for_c all, LPVOID lpReserved) {
extern "C" BOOL WINAPI DllMain(HANDLE hModule, DWORD
ul_reason_for_c all, LPVOID lpReserved) {
switch(ul_reaso n_for_call) {
case DLL_PROCESS_ATT ACH:
printf("Start\n ");
g_hModule = hModule;
Init();
return TRUE;

case DLL_PROCESS_DET ACH:
printf("Stop\n" );
Cleanup();
return TRUE;
}

return TRUE;
}

[KWhat4]

Just out of curiosity, what made you think that [comp.lang.c++] would be

a good place to ask?

I think it might be a windows cpp issue.

[red floyd]

KWhat4 wrote:

>Just out of curiosity, what made you think that [comp.lang.c++] would be
a good place to ask?

I think it might be a windows cpp issue.

Try again. Try a newsgroup with either Microsoft or Java in its name.