Codeproject上RedoUndo项目迁移到vs2010后显示未初始化的问题。。。

[lpfly]

这个基于内存管理的Undo Redo The Easy Way的source code

原文地址http://www.codeproject.com/KB/cpp/transactions.aspx?fid=11253&df=90&mpp=50&noise=3&sort=Position&view=Expanded&fr=1#xx0xx

下载后 运行里面的DrawIt（SDI） 迁移至2010 Build通过但是Debug就出现
Unhandled exception at 0x0116e7b9 in DrawIt.exe: 0xC0000005: Access violation writing location 0x00000000.

出错的代码是

data = new(Mm::Allocate(sizeof(DocData), sid)) DocData();

这个函数是这样的。。。

void* Allocate(size_t size, SPACEID sid)
	{
		AUDIT

		Spaces::iterator s = spaces.find(sid);
		if (s == spaces.end())
			return NULL;
	
		Space& space = s->second;
		if (!space.transacting) 
			return NULL;

		size = max(size, sizeof(Free));
		
		// TODO: assert that "data" is allocated in space
		space.AssertData();

		// are there any more free chunks?
		if (!space.data->sFreeHead) {
			space.data->Insert(space.More(size));
		}
		
		AUDIT

		// find the first chunk at least the size requested
		Free* prev = 0;
		Free* f = space.data->sFreeHead;
		while (f && (f->size < size)) {
			prev = f;
			f = f->next;
		}

		AUDIT
		// if we found one, disconnect it
		if (f) {
			space.data->locTree.remove((size_t)f);

			if (prev) prev->next = f->next;
			else space.data->sFreeHead = f->next;
			
			f->next = 0;
			memset(&f->loc, 0, sizeof(f->loc));
		} else {
			f = space.More(size);
		}

		// f is disconnected from the free list at this point

		AUDIT

		// if the free chunk is too(?) big, carve a peice off and return
		// the rest to the free list
		if (f->size > (2*(size + sizeof(Free)))) {
			Free* tmp = space.data->Slice(f, size); // slice size byte off 'f'
			space.data->Insert(f); // return the remainder to the free list
			f = tmp;
		}
		
		AUDIT

		CHECK_POINTER(f)

		void* p = reinterpret_cast<void*>((char*)f + sizeof(Free::SIZE_TYPE));

		CHECK_POINTER(p)

		return p;
	}

请教何解？

[lpfly]

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