如题，zebra官网给出的扫码枪SDK示例是基于MFC的，自己用的是QT，加大了开发难度（悔不当初用MFC），同时也对com组件不熟悉，导致折腾了好几天才搞定。也不知道这么做能不能满足QT跨平台的初衷，Windows是能用的，给大家参考一下。
1、下面是代码，命令发送这部分很容易解决，稍微改下就行，主要是接收com组件的事件，我这边采用了回调函数的方式接收信息。
1 private:
2 DWORD m_dwRefCount;
3 Callback //自己定义的回调函数
4 void * user;
5 public:
6 void SetCallbackFunc(CallbackGetScannerData cbk, void* user)
7 {
8 this->cbkGetData = cbk;
9 this->user = user;
10 }
11
12 CEventSink() { m_dwRefCount = 0; }
13 virtual ~CEventSink(void) {}
14
15 STDMETHODIMP GetTypeInfoCount(UINT *pctinfo) { return E_NOTIMPL; }
16 STDMETHODIMP GetTypeInfo(UINT iTInfo, LCID lcid, ITypeInfo **ppTInfo) { return E_NOTIMPL; }
17 STDMETHODIMP GetIDsOfNames(REFIID riid, LPOLESTR *rgszNames, UINT cNames, LCID lcid, DISPID *rgDispId) { return E_NOTIMPL; }
18
19 STDMETHODIMP Invoke(DISPID dispIdMember, REFIID riid, LCID lcid, WORD wFlags, DISPPARAMS *pDispParams, VARIANT *pVarResult, EXCEPINFO *pExcepInfo, UINT *puArgErr)
20 {
21 LONG *lValue = pVarResult->plVal;
22 switch (dispIdMember)
23 {
24 case 3: //能获取到扫描枪扫的条码信息
25 {
26 VARIANT varlValue;
27 VARIANT varlValue1;
28 short lValue = 0;
29 BSTR lValue1;
30 varlValue = (pDispParams->rgvarg)[1];
31 varlValue1 = (pDispParams->rgvarg)[0];
32 //varlValue1.pbstrVal
33 lValue = V_I2(&varlValue);
34 lValue1 = SysAllocString(*(varlValue1.pbstrVal));
35 if(cbkGetData)
36 //放自己定义的回调函数
37 break;
38 }
39 default:
40 break;
41 }
42 //printf(" ---------the result %d
", *lValue);
43 //OnReceiver(lValue);
44 return S_OK;
45 }
46 STDMETHOD(QueryInterface)(REFIID iid, LPVOID* ppv)
47 {
48 if ((iid == __uuidof(_ICoreScannerEvents)) || //(iid == __uuidof(IMarshal)) ||
49 (iid == __uuidof(IDispatch)) ||
50 (iid == __uuidof(IUnknown)))
51 {
52 m_dwRefCount++;
53 *ppv = this;
54 }
55 else
56 {
57 *ppv = NULL;
58 return E_NOINTERFACE;
59 }
60 return S_OK;
61 }
62 STDMETHOD_(ULONG, AddRef)()
63 {
64 return InterlockedIncrement(&m_dwRefCount);
65 }
66 STDMETHOD_(ULONG, Release)()
67 {
68 InterlockedDecrement(&m_dwRefCount);
69 if (m_dwRefCount != 0)
70 return m_dwRefCount;
71 delete this;
72 return 0;
73 }
74 };
2、下面是调用的这个类的代码
1 if(ScannerInterface)
2 {
3 HRESULT hr = S_FALSE;
4 //Create the Scanner COM object
5 IConnectionPointContainer *pCPC;
6 hr = ScannerInterface->QueryInterface(IID_IConnectionPointContainer, (void **)&pCPC);
7 if (!SUCCEEDED(hr))
8 {
9 return -1;
10 }
11
12 //获取连接点
13 hr = pCPC->FindConnectionPoint(DIID__ICoreScannerEvents, &pCP);
14 if (!SUCCEEDED(hr))
15 {
16 return -1;
17 }
18 pCPC->Release();
19
20 IUnknown *pSinkUnk;
21 ScannerEventSink = new CEventSink();
22 ScannerEventSink->SetCallbackFunc(//自定义的回调函数, user);
23
24 hr = ScannerEventSink->QueryInterface(DIID__ICoreScannerEvents, (void **)&pSinkUnk);
25 hr = pCP->Advise(pSinkUnk, &dwAdvise);//注册其接收接口指针
26 if (!SUCCEEDED(hr))
27 {
28 return -1;
29 }
30 }