Hi All,
I recently moved to mfc embedding browser based on mfcembed example
(mozilla-0-9-3 codebase) on win98 and vc++6.
I have added some functions into the mfcembed example's browserview
file, part of code like:
nsCOMPtr<nsIDOMDocument> domDocument;
aWindow->GetDocument(getter_AddRefs(domDocument));
nsCOMPtr<nsIDocument> aDocument =
do_QueryInterface(domDocument);
nsCOMPtr<nsIPrincipal> docPrincipal;
rv = aDocument->GetPrincipal(getter_AddRefs(docPrincipal));
if (NS_FAILED(rv))
{
return;
}
nsCOMPtr<nsIPresShell> pShell;
PRInt32 cnt = aDocument->GetNumberOfShells();
if(cnt <= 0)
{
return;
}
rv = aDocument->GetShellAt(0, getter_AddRefs(pShell));
if(NS_FAILED(rv))
return;
I then used VC++6 IDE to build the release version of the executable
with debug info option. The application threw the exception at runtime
as:
Debug Error.
Module:
File: i386\chkesp.c
Line: 42
The value of ESP was not properly saved across a function call. This is
usually a result of calling a function declared with one calling
convention
with a function pointer declared with a different calling convention.
When I debugged into source code, the breakpoint pointed to the line
"PRInt32 cnt = aDocument->GetNumberOfShells();"
In fact, I built three versions of mozilla libs/dlls release: one using
default build options (defined in config\win32), one using debug
info(set MOZ_PROFILE) and without optimised (changed /O1 to /Od), and
one with debug info and optimised (/O1).
The problem remains whenever I linked the application with these
different version of release built libraries.
As I refer to MS document, it seems tell me that __stdcall convention
conflicts with __cdecl (which is default in VC IDE). So, I changed to
__stdcall option (/Gz) and tried to build the executable but the IDE
gave a heaps of linkage errors as:
Creating library Release/mfcembed.lib and object Release/mfcembed.exp
BrowserView.obj : error LNK2001: unresolved external symbol
"__declspec(dllimport) class nsIWeakReference * __stdcall
NS_GetWeakReference(class nsISupports *,unsigned int *)"
(__imp_?NS_GetWeakReference@@YGPAVnsIWeakReference@@PAVnsISupports@@PAI@Z)
BrowserView.obj : error LNK2001: unresolved external symbol "public:
static void __stdcall nsMemory::Free(void *)" (?Free@nsMemory@@SGXPAX@Z)
BrowserView.obj : error LNK2001: unresolved external symbol
"__declspec(dllimport) char * __stdcall ToNewUTF8String(class nsAString
const &)" (__imp_?ToNewUTF8String@@YGPADABVnsAString@@@Z)
MfcEmbed.obj : error LNK2001: unresolved external symbol
"__declspec(dllimport) public: static unsigned int __stdcall
nsComponentManager::UnregisterFactory(struct nsID const &,class
nsIFactory *)" (__imp_?UnregisterFactory@nsComponentManager@@SGIABU
nsID@@PAVnsIFactory@@@Z)
... ...
I assume the mozilla build on win32 uses __stdcall convention (nsCom.h
macro definintion using __stdcall) but the linkage seems tell me that it
couldn't find object symbols with __stdcall convention.
Actually, I have debug build as well. However, the debug version of
build always throws exception regardless of non-fatal warnings (e.g
can't find histroy file (db)) or fatal errors. So, it makes me difficult
to use debug version (refer to bug#94070 in bugzilla).
Could anyone tell me which bit I should add into my release build to
make the embedding app work without such exception?
Thanks in advance
