bool
HandleToFilename(HANDLE aHandle, const LARGE_INTEGER& aOffset,
nsAString& aFilename)
{
aFilename.Truncate();
// This implementation is nice because it uses fully documented APIs that
// are available on all Windows versions that we support.
nsAutoHandle fileMapping(CreateFileMapping(aHandle, nullptr, PAGE_READONLY,
0, 1, nullptr));
if (!fileMapping) {
return false;
}
ScopedMappedView view(MapViewOfFile(fileMapping, FILE_MAP_READ,
aOffset.HighPart, aOffset.LowPart, 1));
if (!view) {
return false;
}
nsAutoString mappedFilename;
DWORD len = 0;
SetLastError(ERROR_SUCCESS);
do {
mappedFilename.SetLength(mappedFilename.Length() + MAX_PATH);
len = GetMappedFileNameW(GetCurrentProcess(), view,
wwc(mappedFilename.BeginWriting()),
mappedFilename.Length());
} while (!len && GetLastError() == ERROR_INSUFFICIENT_BUFFER);
if (!len) {
return false;
}
mappedFilename.Truncate(len);
return NtPathToDosPath(mappedFilename, aFilename);
}
//----------------------------------------------------------------------------
// writeHandle()
// Writes a window handle to the mem-file.
// Creates the memfile and returns in case of success the handle for that
// file for cleaning up. This method is called to pass a window handle to the
// page actions dll.
// The dll is responsible for closing the file!
HRESULT Base::writeHandle(const HWND aWindowHandle, HANDLE & aFileMapping)
{
__int32 ihwndMain = (__int32)aWindowHandle;
DWORD dataSize = sizeof(__int32);
CHandle fileMapping(::CreateFileMapping( INVALID_HANDLE_VALUE, NULL,
PAGE_READWRITE, 0, dataSize, sFileMappingName ));
if (!fileMapping) {
return HRESULT_FROM_WIN32(::GetLastError());
}
LPVOID data = ::MapViewOfFile( fileMapping, FILE_MAP_ALL_ACCESS, 0, 0, dataSize );
if( !data ) {
return HRESULT_FROM_WIN32(::GetLastError());
}
::CopyMemory( data, &ihwndMain, dataSize );
::UnmapViewOfFile( data );
aFileMapping = fileMapping.Detach();
return S_OK;
}
//----------------------------------------------------------------------------
// readHandle()
// Read a window handle (from an IE main window) from the mem-file.
HRESULT Base::readHandle(HWND & aWindowHandle)
{
CHandle fileMapping(::OpenFileMapping( FILE_MAP_ALL_ACCESS, FALSE, sFileMappingName ));
if (!fileMapping) {
return HRESULT_FROM_WIN32(::GetLastError());
}
DWORD dataSize = sizeof(__int32);
LPVOID data = ::MapViewOfFile( fileMapping, FILE_MAP_ALL_ACCESS, 0, 0, dataSize );
if( !data ) {
return HRESULT_FROM_WIN32(::GetLastError());
}
__int32 ihwndMain = 0;
::CopyMemory( &ihwndMain, data, dataSize );
::UnmapViewOfFile( data );
fileMapping.Close();
if (!ihwndMain || !::IsWindow((HWND)ihwndMain)) {
return E_INVALIDARG;
}
aWindowHandle = (HWND)ihwndMain;
return S_OK;
}
