大华sdk c++回调踩坑 -102 IMV_INVALID_HANDLE

回调返回的handle是空指针 IMV_INVALID_HANDLE

//这里的pUser是0x00000  使用全局的handle代替
void onGetFrame(IMV_Frame* pFrame, void* pUser)
{
	if (pFrame == NULL)
	{
		printf("pFrame is NULL\n");
		return;
	}

	idx += 1;
	if (idx==1) {
		start = chrono::steady_clock::now();
	}

	//

	//pFrame->pData
	saveImageToBmp(pFrame);
	if (idx==20) {
		idx = 0;
		printf("Get frame blockId = %llu\n", pFrame->frameInfo.blockId);
		auto end = chrono::steady_clock::now();
		cout << "Elapsed time in milliseconds: "
			<< chrono::duration_cast<chrono::milliseconds>(end - start).count()
			<< " ms" << endl;
	}


	//printf("Get frame blockId = %llu\n", pFrame->frameInfo.blockId);

	return;
}