【转帖】access violation
 

access violation
access violation
in the exhostappservices.cpp there is a place that i get an access violation enumerating the registry. i get the error code error_no_more_items, but it is not catered for and the variables nvalnamesize and ndatasize are both 0.
previous code is
do
{
tchar* lpvalname = new tchar[nvalnamesize];
lpbyte lpdata = new byte[ndatasize];
nres = ::regenumvalue(hfonts, nindex, lpvalname, &nvalnamesize, null, null, lpdata, &ndatasize);
if(nres == error_more_data)
{
nvalnamesize += 20;
}
else
{
svaluename = lpvalname;
filename = (lpctstr)lpdata;
}
delete lpvalname;
delete lpdata;
}
while(nres == error_more_data);
i suggest we change to
do
{
tchar* lpvalname = new tchar[nvalnamesize];
lpbyte lpdata = new byte[ndatasize];
nres = ::regenumvalue(hfonts, nindex, lpvalname, &nvalnamesize, null, null, lpdata, &ndatasize);
if(nres == error_more_data)
{
nvalnamesize += 20;
}
else if( nres == error_success)
{
svaluename = lpvalname;
filename = (lpctstr)lpdata;
}
delete lpvalname;
delete lpdata;
}
while(nres == error_more_data);
else the line filename = (lpctstr) lpdata access violates. (it access violates some where in odstring, and hence i dont have source for there so i have to leave you gurus to make the correct decision.
also to help you : the call stack is as follows :
activextest.ocx!odansistring::odansistring() + 0x19
activextest.ocx!odstring::odstring() + 0x54
activextest.ocx!odstring:perator=() + 0x28
> activextest.ocx!exhostappservices::ttffilenamebyde scriptor(const odttfdescriptor & descr={...}, odstring & filename={...}) line 293 c++
activextest.ocx!oddbfontservices::loadstylerec() + 0x61a
activextest.ocx!odgitextstyle::loadstylerec() + 0xb4
activextest.ocx!odmtextiterator::changefont() + 0x449
activextest.ocx!odmtextiterator:rocess() + 0x896
ntdll.dll!7c9106eb()
ntdll.dll!7c911596()
ntdll.dll!7c911596()
ntdll.dll!7c9106eb()
ntdll.dll!7c911538()
ntdll.dll!7c911596()
ntdll.dll!7c9106eb()
ntdll.dll!7c911596()
ntdll.dll!7c911596()
ntdll.dll!7c9106eb()
ntdll.dll!7c910732()
ntdll.dll!7c9106ab()
ntdll.dll!7c910d5c()
ntdll.dll!7c910f46()
ntdll.dll!7c960af8()
ntdll.dll!7c960bcc()
ntdll.dll!7c960af8()
ntdll.dll!7c960bf0()
ntdll.dll!7c960bcc()
ntdll.dll!7c91056d()
msvcrtd.dll!_free_base(void * pblock=0x00000009) line 96 c
msvcrtd.dll!_free_dbg(void * puserdata=0x01a70110, int nblockuse=1) line 1006 + 0x7 c
msvcrtd.dll!free(void * puserdata=0x7c9180ff) line 956 + 0xb c
ntdll.dll!7c90d4ea()
ntdll.dll!7c9180ff()
ntdll.dll!7c90d4ea()
ntdll.dll!7c9180ff()
ntdll.dll!7c911596()
ntdll.dll!7c9106eb()
ntdll.dll!7c911596()
ntdll.dll!7c9106eb()
ntdll.dll!7c911596()
ntdll.dll!7c911596()
ntdll.dll!7c9106eb()
ntdll.dll!7c912270()
ntdll.dll!7c911596()
ntdll.dll!7c9106eb()
also as a side note: this fixed a memory corruption i was having on 2- 3 machines in the test office. as in the previous threads i posted previously :
we fixed it so:
code:
do
{
tchar* lpvalname = new tchar[nvalnamesize];
lpbyte lpdata = new byte[ndatasize];
nres = ::regenumvalue(hfonts, nindex, lpvalname, &nvalnamesize, null, null, lpdata, &ndatasize);
if (nres == error_more_data)
{
nvalnamesize += 20;
}
else if (nres == error_success)
{
svaluename = lpvalname;
filename = (lpctstr)lpdata;
}
else
{
svaluename.empty();
filename.empty();
}
delete lpvalname;
delete lpdata;
}
while (nres == error_more_data);
sergey slezkin