System crash when DAQmx call to USB DAQ device is powered off

My PC crashes when I attempt communication with a NI DAQPad 6015 USB device which is in the powered off state. I am attempting to add error handling to my LabView application to cover the above condition, however, instead of receiving a error message, my PC crashes. When the device is powered on, my LabView routine works properly. I created the vi using the DAQmx DAQ assistant for a simple analog read from the device. I want to add the potential error handling condition to cover the case in which a user may attempt to run the software without turning on the device. When I attempted to run my vi twice with the device powered off, my PC crashed both times. The 2nd time, during reboot, I discovered that MAX was corrupted and had to repair using the installation CD.
I am using LabView 7.1 with DAQ 7.4 on Windows 2000.
Is there a known fix or workaround to this issue? Or is there a way to detect the presence of the device first before trying a DAQ read?
Thanks,
Joel

Thanks very much for both your responses. I tried it again, but as you suggested, I used one of the example vi's. I chose the following:
Acq&GraphVoltage-IntClk.vi found within: Hardware Input and Output >> DAQmx >> Analog Measurements >> Voltage
I first tested the example vi with my DAQPad-6015 powered on. The vi successfully ran without error. I then turned the DAQPAd power off and ran the vi again. My system immediately crashed leaving me with a blank screen (with streaky lines) and forcing me to reboot. After reboot, I discovered that I can no longer open any of the DAQmx examples that are compatible with the DAQPad-6015. All are corrupted. Curiously, MAX was not corrupted again. I will have to re-install all examples and possibly LabView itself.
Based on your feedback, I am guessing you will tell me that repeating the above on your system will simply produce an error message, as expected. It appears that I may have a fundamental incompatibility between my specific system hardware and DAQmx/LabView.
Regards,
Joel

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Event Type:             Error
Event Source:         DCOM
Event Category:       None
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Date:                       4/8/2011
Time:                       11:58:43 PM
User:                        NT AUTHORITY\LOCAL SERVICE
Computer:
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The machine-default permission settings do not grant Local Activation permission for the COM Server application with CLSID
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Data:
0000: 53 79 73 74 65 6d 20 45   System E
0008: 72 72 6f 72 20 20 45 72   rror Er
0010: 72 6f 72 20 63 6f 64 65   ror code
0018: 20 31 30 30 30 30 30 64    100000d
0020: 31 20 20 50 61 72 61 6d   1 Param
0028: 65 74 65 72 73 20 30 30   eters 00
0030: 61 38 63 33 36 65 2c 20   a8c36e,
0038: 30 30 30 30 30 30 30 32   00000002
0040: 2c 20 30 30 30 30 30 30   , 000000
0048: 30 31 2c 20 38 61 35 34   01, 8a54
0050: 65 36 66 37               e6f7

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shimadzu-lc-6a-hplc-pump-service-manual-eng.pdf ‏985 KB

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Early this morning from my way to office when I plug my iPhone 3gs to my itrip in my car it is working fine. But when somebody called in my iPhone it suddenly turn off, and I can not turn it on again. I really don't know what to do, please help me?

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405a1000-405a9000 r-xp 00000000 00:09 702782 /usr/local/j2sdk1.4.2_01/jre/lib/i386/native_threads/libhpi.so
405a9000-405aa000 rw-p 00007000 00:09 702782 /usr/local/j2sdk1.4.2_01/jre/lib/i386/native_threads/libhpi.so
405aa000-405b4000 r-xp 00000000 03:02 4571 /lib/libnss_compat-2.2.3.so
405b4000-405b6000 rw-p 00009000 03:02 4571 /lib/libnss_compat-2.2.3.so
405b6000-405ba000 rw-s 00000000 03:02 61954 /tmp/hsperfdata_lina/448
405ba000-405ca000 r-xp 00000000 00:09 702789 /usr/local/j2sdk1.4.2_01/jre/lib/i386/libverify.so
405ca000-405cc000 rw-p 0000f000 00:09 702789 /usr/local/j2sdk1.4.2_01/jre/lib/i386/libverify.so
405cc000-405ec000 r-xp 00000000 00:09 702790 /usr/local/j2sdk1.4.2_01/jre/lib/i386/libjava.so
405ec000-405ee000 rw-p 0001f000 00:09 702790 /usr/local/j2sdk1.4.2_01/jre/lib/i386/libjava.so
405ee000-40602000 r-xp 00000000 00:09 702792 /usr/local/j2sdk1.4.2_01/jre/lib/i386/libzip.so
40602000-40605000 rw-p 00013000 00:09 702792 /usr/local/j2sdk1.4.2_01/jre/lib/i386/libzip.so
40605000-41f9d000 r--s 00000000 00:09 702849 /usr/local/j2sdk1.4.2_01/jre/lib/rt.jar
41fe7000-41ffd000 r--s 00000000 00:09 702814 /usr/local/j2sdk1.4.2_01/jre/lib/sunrsasign.jar
41ffd000-420d8000 r--s 00000000 00:09 702846 /usr/local/j2sdk1.4.2_01/jre/lib/jsse.jar
420d8000-420e9000 r--s 00000000 00:09 702815 /usr/local/j2sdk1.4.2_01/jre/lib/jce.jar
420e9000-42642000 r--s 00000000 00:09 702847 /usr/local/j2sdk1.4.2_01/jre/lib/charsets.jar
446ea000-446ed000 r--s 00000000 00:09 392707 /usr/local/j2sdk1.4.2_01/jre/lib/ext/dnsns.jar
446ed000-446ef000 r-xp 00000000 00:08 538715 /usr/X11R6/lib/X11/locale/lib/common/xlcDef.so.2
446ef000-446f0000 rw-p 00001000 00:08 538715 /usr/X11R6/lib/X11/locale/lib/common/xlcDef.so.2
4c770000-4c78c000 r--s 00000000 00:09 392706 /usr/local/j2sdk1.4.2_01/jre/lib/ext/sunjce_provider.jar
4c78c000-4c799000 r--s 00000000 00:09 392709 /usr/local/j2sdk1.4.2_01/jre/lib/ext/ldapsec.jar
4c799000-4c855000 r--s 00000000 00:09 392770 /usr/local/j2sdk1.4.2_01/jre/lib/ext/localedata.jar
4c855000-4cb20000 r-xp 00000000 00:09 702800 /usr/local/j2sdk1.4.2_01/jre/lib/i386/libawt.so
4cb20000-4cb36000 rw-p 002ca000 00:09 702800 /usr/local/j2sdk1.4.2_01/jre/lib/i386/libawt.so
4cb5b000-4cbae000 r-xp 00000000 00:09 702799 /usr/local/j2sdk1.4.2_01/jre/lib/i386/libmlib_image.so
4cbae000-4cbaf000 rw-p 00052000 00:09 702799 /usr/local/j2sdk1.4.2_01/jre/lib/i386/libmlib_image.so
4cbaf000-4cbb5000 r-xp 00000000 00:08 98053 /usr/X11R6/lib/libXp.so.6.2
4cbb5000-4cbb6000 rw-p 00006000 00:08 98053 /usr/X11R6/lib/libXp.so.6.2
4cbb6000-4cbfa000 r-xp 00000000 00:08 98182 /usr/X11R6/lib/libXt.so.6.0
4cbfa000-4cbfd000 rw-p 00044000 00:08 98182 /usr/X11R6/lib/libXt.so.6.0
4cbfe000-4cc0a000 r-xp 00000000 00:08 98136 /usr/X11R6/lib/libXext.so.6.4
4cc0a000-4cc0b000 rw-p 0000b000 00:08 98136 /usr/X11R6/lib/libXext.so.6.4
4cc0b000-4cc0f000 r-xp 00000000 00:08 98057 /usr/X11R6/lib/libXtst.so.6.1
4cc0f000-4cc10000 rw-p 00003000 00:08 98057 /usr/X11R6/lib/libXtst.so.6.1
4cc10000-4ccc4000 r-xp 00000000 00:08 98072 /usr/X11R6/lib/libX11.so.6.2
4ccc4000-4ccc7000 rw-p 000b4000 00:08 98072 /usr/X11R6/lib/libX11.so.6.2
4ccc7000-4ccce000 r-xp 00000000 00:08 98068 /usr/X11R6/lib/libSM.so.6.0
4ccce000-4cccf000 rw-p 00007000 00:08 98068 /usr/X11R6/lib/libSM.so.6.0
4cccf000-4cce2000 r-xp 00000000 00:08 98046 /usr/X11R6/lib/libICE.so.6.3
4cce2000-4cce3000 rw-p 00012000 00:08 98046 /usr/X11R6/lib/libICE.so.6.3
4cce5000-4cd9f000 r-xp 00000000 00:09 702803 /usr/local/j2sdk1.4.2_01/jre/lib/i386/libfontmanager.so
4cd9f000-4cdb9000 rw-p 000b9000 00:09 702803 /usr/local/j2sdk1.4.2_01/jre/lib/i386/libfontmanager.so
4cdba000-4cdc3000 r-xp 00000000 03:02 4574 /lib/libnss_files-2.2.3.so
4cdc3000-4cdc4000 rw-p 00008000 03:02 4574 /lib/libnss_files-2.2.3.so
4cdc4000-4cdc7000 r-xp 00000000 03:02 4573 /lib/libnss_dns-2.2.3.so
4cdc7000-4cdc8000 rw-p 00002000 03:02 4573 /lib/libnss_dns-2.2.3.so
4cdc8000-4cdd5000 r-xp 00000000 03:02 4580 /lib/libresolv-2.2.3.so
4cdd5000-4cdd7000 rw-p 0000c000 03:02 4580 /lib/libresolv-2.2.3.so
4cdd9000-4cde0000 r-xp 00000000 00:08 98131 /usr/X11R6/lib/libXcursor.so.1.0
4cde0000-4cde1000 rw-p 00007000 00:08 98131 /usr/X11R6/lib/libXcursor.so.1.0
4cde1000-4cde7000 r-xp 00000000 00:08 98181 /usr/X11R6/lib/libXrender.so.1.2
4cde7000-4cde8000 rw-p 00006000 00:08 98181 /usr/X11R6/lib/libXrender.so.1.2
4cde8000-4ce01000 r-xp 00000000 00:08 538718 /usr/X11R6/lib/X11/locale/lib/common/ximcp.so.2
4ce01000-4ce03000 rw-p 00019000 00:08 538718 /usr/X11R6/lib/X11/locale/lib/common/ximcp.so.2
4ce03000-4ce04000 r-xp 00000000 00:0d 3932325 /tcg_2/lina/bosse/ownlib/libjtc.so
4ce04000-4ce05000 rw-p 00000000 00:0d 3932325 /tcg_2/lina/bosse/ownlib/libjtc.so
4ce05000-4d0b4000 r-xp 00000000 00:0d 3932330 /tcg_2/lina/bosse/ownlib/libtc.so
4d0b4000-4d0ee000 rw-p 002ae000 00:0d 3932330 /tcg_2/lina/bosse/ownlib/libtc.so
4e89e000-4e8a1000 r-xp 00000000 00:0d 3932324 /tcg_2/lina/bosse/ownlib/jtcrut.o
4e8a1000-4e8a2000 rw-p 00002000 00:0d 3932324 /tcg_2/lina/bosse/ownlib/jtcrut.o
Heap at VM Abort:
Heap
def new generation total 576K, used 349K [0x446f0000, 0x44790000, 0x44bd0000)
eden space 512K, 57% used [0x446f0000, 0x44739df8, 0x44770000)
from space 64K, 83% used [0x44770000, 0x4477d620, 0x44780000)
to space 64K, 0% used [0x44780000, 0x44780000, 0x44790000)
tenured generation total 1408K, used 873K [0x44bd0000, 0x44d30000, 0x486f0000)
the space 1408K, 62% used [0x44bd0000, 0x44caa648, 0x44caa800, 0x44d30000)
compacting perm gen total 5120K, used 4953K [0x486f0000, 0x48bf0000, 0x4c6f0000)
the space 5120K, 96% used [0x486f0000, 0x48bc6760, 0x48bc6800, 0x48bf0000)
Local Time = Wed Oct 29 08:09:06 2003
Elapsed Time = 7
# The exception above was detected in native code outside the VM
# Java VM: Java HotSpot(TM) Client VM (1.4.2_01-b06 mixed mode)
# An error report file has been saved as hs_err_pid448.log.
# Please refer to the file for further information.

From the docs, here are the two (C vs C++) ways of using JNI, so I think I misled you slightly.
jdouble Java_pkg_Cls_f__ILjava_lang_String_2 (
     JNIEnv *env,        /* interface pointer */
     jobject obj,        /* "this" pointer */
     jint i,             /* argument #1 */
     jstring s)          /* argument #2 */
     /* Obtain a C-copy of the Java string */
     const char *str = (*env)->GetStringUTFChars(env, s, 0);
     /* process the string */
     /* Now we are done with str */
     (*env)->ReleaseStringUTFChars(env, s, str);
     return ...
Note that we always manipulate Java objects using the interface pointer env . Using C++, you can write a slightly cleaner version of the code, as shown in Code Example 2-2:
Code Example 2-2 Implementing a Native Method Using C++
extern "C" /* specify the C calling convention */
jdouble Java_pkg_Cls_f__ILjava_lang_String_2 (
     JNIEnv *env,        /* interface pointer */
     jobject obj,        /* "this" pointer */
     jint i,             /* argument #1 */
     jstring s)          /* argument #2 */
     const char *str = env->GetStringUTFChars(s, 0);
     env->ReleaseStringUTFChars(s, str);
     return ...

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