SavePanelState crashes in 64-bit build

Question

I am coding the setup tab for a test application.  The user enters data into several fields on a main panel and clicks a button when finished.  I am trying to use the SavePanelState and RecallPanelState functions to save and restore the setup data to/from a file, but when I build my program as a 64-bit application, SavePanelState causes the program to crash.  When built as a 32-bit application it works fine. 
My code is attached.  I am running on Windows 7 Professional 64-bit OS.
Rich Ferrara
Telephonics
* Function: SaveSetup
* Description: This function is the callback for the OK button.
* It saves the setup information and sets the new test mode.
* Input Parameters: panel - ID of the panel activated
* control - ID of the control activated
* event - ID of the event triggered
* callbackData - extra data sent to the callback
* eventData1 - parameter sent to the callback
* eventData2 - parameter sent to the callback
* Output Parameters: returns 0
int CVICALLBACK SaveSetup (int panel, int control, int event,
void *callbackData, int eventData1, int eventData2)
char fileName[MAX_PATHNAME_LEN];
char data[BUFFER_LEN];
int index;
int mode;
FILE *ofp;
switch (event)
case EVENT_COMMIT:
// ===== Temporary unit test code: open a text file to =====
// ===== save the panel settings =====
// ===== In the final PLATE, this will be saved to the =====
// ===== summary and/or verbose log files =====
MakePathname(GetTempFolder(), "setup.txt", fileName);
ofp = fopen(fileName, "w");
// Save the test operator name
GetLabelFromIndex(panel, MAIN_TEST_OPERATOR,
lastSelectedUserIndex, data);
fprintf(ofp, "Test operator: %s\n", data);
// Save the access level
GetCtrlIndex(panel, MAIN_ACCESS_LEVEL, &index);
GetLabelFromIndex(panel, MAIN_ACCESS_LEVEL, index, data);
fprintf(ofp, "Access level: %s\n", data);
// Save the test mode
GetCtrlIndex(panel, MAIN_TEST_MODE, &index);
GetLabelFromIndex(panel, MAIN_TEST_MODE, index, data);
fprintf(ofp, "Test mode: %s\n", data);
GetCtrlVal(panel, MAIN_TEST_MODE, &mode);
// Save the PLATE system number
GetCtrlVal(panel, MAIN_PLATE_SYS_NUM, data);
fprintf(ofp, "PLATE system number: %s\n", data);
// Save the PLATE hardware revision
GetCtrlVal(panel, MAIN_PLATE_HW_REV, data);
fprintf(ofp, "PLATE hardware revision: %s\n", data);
// Save the PLATE software release
GetCtrlVal(panel, MAIN_PLATE_SW_REL, data);
fprintf(ofp, "PLATE software release: %s\n", data);
// Save the test date
GetCtrlVal(panel, MAIN_TEST_DATE, data);
fprintf(ofp, "Test date: %s\n", data);
// Save the test time
GetCtrlVal(panel, MAIN_TEST_TIME, data);
fprintf(ofp, "Test time: %s\n", data);
// Save RDP data only if not entering Calibration mode
if (mode != CALIBRATION)
// Save the RDP serial number
GetCtrlVal(panel, MAIN_RDP_SERIAL_NUM, data);
fprintf(ofp, "RDP serial number: %s\n", data);
// Save the RDP hardware revision
GetCtrlVal(panel, MAIN_RDP_HW_REV, data);
fprintf(ofp, "RDP hardware revision: 349-1000-%s\n", data);
// Save the RDP software release
GetCtrlIndex(panel, MAIN_RDP_SW_REL, &index);
GetLabelFromIndex(panel, MAIN_RDP_SW_REL, index, data);
fprintf(ofp, "RDP software release: %s\n", data);
// Save the comments
GetCtrlVal(panel, MAIN_COMMENTS, data);
fprintf(ofp, "Comments: %s\n", data);
// Close the text file
fclose(ofp);
// Alert the user (this may be part of the final PLATE, or we may
// just switch to another tab)
MessagePopup("Setup", "Data saved.");
// ===== End temporary unit test code =====
// Save the state of all panel controls
MakePathname(GetTempFolder(), SETUP_STATE_FILE, fileName);
SavePanelState(panel, fileName, 0);
break;
return 0;
Solved!
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Answer 1

Hi Taylor,
I am using LabWindows 2010 (10.0.1).
There are no errors or warnings displayed until the program crashes.  It happens using both the Release64 and Debug64 configurations, although the errors displayed are different (see attached files).  Running the program from a command prompt produces the same results.
I am also attaching our UIR file for reference, but I saw the same results running a simple GUI with only a few command buttons and a numeric input.
Rich
Attachments:
release.jpg ‏28 KB
debug.jpg ‏21 KB
GuiSetup.uir ‏12 KB