I am puzzled. Attached are some examples. ex7.c is the most basic one. Basically writing to a NULL pointer to cause an exception. In the exception handler, a dialog is shown, then the program terminates.
In ex8.c I've used native CE calls to create a file and write to it
before the exception, after it (should never happen), and from the
handler. I have a similar file using stdio which exhibits the same
behaviour : it doesn't do what I think it should.
The result is a file with a single message
Main : start
instead of
Main : start
Handler
In ex9.c you can see that things continue to work if no file was opened
before causing an exception.
In ex8b.c you can see that merely opening a file is enough to cause the
exception handler not to work any more.
Can anyone shed light on this ?
Thanks,
Danny
--
Danny Backx ; danny.backx - at - scarlet.be ; http://danny.backx.info
#include <windows.h>
#include <stdio.h>
#include <stdlib.h>
#include "myexcpt.h"
void handler(struct _EXCEPTION_RECORD *ExceptionRecord,
void *EstablisherFrame,
struct _CONTEXT *ContextRecord,
struct _DISPATCHER_CONTEXT *DispatcherContext)
{
MessageBoxW(0, L" ? ", L"Handler : error", 0);
exit(0);
}
int main(int argc, char *argv[])
__attribute__((__exception_handler__(handler)));
int main(int argc, char *argv[])
{
int *i;
i = 0;
*i = 1;
exit(0);
}
#include <windows.h>
#include <stdio.h>
#include <stdlib.h>
#include "myexcpt.h"
HANDLE h = 0;
void handler(struct _EXCEPTION_RECORD *ExceptionRecord,
void *EstablisherFrame,
struct _CONTEXT *ContextRecord,
struct _DISPATCHER_CONTEXT *DispatcherContext)
{
DWORD w;
WriteFile(h, "Handler\r\n", 9, &w, NULL);
(void)CloseHandle(h);
exit(0);
}
int main(int argc, char *argv[])
__attribute__((__exception_handler__(handler)));
int main(int argc, char *argv[])
{
int *i;
DWORD w;
h = CreateFile(L"\\storage card\\devel\\ex8log.txt", GENERIC_WRITE,
0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, 0);
i = 0;
WriteFile(h, "Main : start\r\n", 14, &w, NULL);
*i = 1;
WriteFile(h, "Main : end\r\n", 12, &w, NULL);
(void)CloseHandle(h);
exit(0);
}
#include <windows.h>
#include <stdio.h>
#include <stdlib.h>
#include "myexcpt.h"
HANDLE h = 0;
void handler(struct _EXCEPTION_RECORD *ExceptionRecord,
void *EstablisherFrame,
struct _CONTEXT *ContextRecord,
struct _DISPATCHER_CONTEXT *DispatcherContext)
{
MessageBoxW(0, L" ? ", L"Handler : error", 0);
exit(0);
}
int main(int argc, char *argv[])
__attribute__((__exception_handler__(handler)));
int main(int argc, char *argv[])
{
int *i;
DWORD w;
h = CreateFile(L"\\storage card\\devel\\ex8log.txt", GENERIC_WRITE,
0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, 0);
(void)CloseHandle(h);
i = 0;
*i = 1;
exit(0);
}
#include <windows.h>
#include <stdio.h>
#include <stdlib.h>
#include "myexcpt.h"
void handler(struct _EXCEPTION_RECORD *ExceptionRecord,
void *EstablisherFrame,
struct _CONTEXT *ContextRecord,
struct _DISPATCHER_CONTEXT *DispatcherContext)
{
DWORD w;
HANDLE h = CreateFile(L"\\storage card\\devel\\handler.txt", GENERIC_WRITE,
0, NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, 0);
WriteFile(h, "Handler\r\n", 9, &w, NULL);
CloseHandle(h);
MessageBoxW(0, L" ? ", L"Handler : error", 0);
exit(0);
}
int main(int argc, char *argv[])
__attribute__((__exception_handler__(handler)));
int main(int argc, char *argv[])
{
int *i;
i = 0;
*i = 1;
exit(0);
}
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