colesafearray如何使用DISPPARAMS和SAFEARRAY

用VC++6.0编写串口通信的程序出现下面的错误提示，求解，谢谢……利用的是mscomm控件错误提示在问题补充中

这个问题出现一般都是变量出现问题了，你去看看问题里面显示的那几个变量，尝试先//消去后的反应。

我做的时候也经常遇到，不要被他吓到了。

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如何使用DISPPARAMS和SAFEARRAY

1> DISPPARAMS配合BSTR使用，在调用的函数结束后释放内存LRESULT CMainDlg::OnOK(WORD /*wNotifyCode*/, WORD wID, HWND /*hWndCtl*/, BOOL& /*bHandled*/){ // TODO: Add validation code DISPPARAMS param; param.cArgs = 3; param.cNamedArgs = 0; param.rgdispidNamedArgs = NULL; param.rgvarg = new VARIANTARG[3]; param.rgvarg[0].vt = VT_BSTR; param.rgvarg[0].bstrVal = SysAllocString(L"A000"); param.rgvarg[1].vt = VT_BSTR; param.rgvarg[1].bstrVal = SysAllocString(L"A111"); param.rgvarg[2].vt = VT_BSTR; param.rgvarg[2].bstrVal = SysAllocString(L"A222"); UserDispparams(&param); SysFreeString(param.rgvarg[0].bstrVal); SysFreeString(param.rgvarg[1].bstrVal); SysFreeString(param.rgvarg[2].bstrVal); delete [] param.rgvarg; CloseDialog(wID); return 0;}// ... ...HRESULT CMainDlg::UserDispparams(DISPPARAMS* pDispParams){ if (!pDispParams) return E_INVALIDARG; if (3 != pDispParams->cArgs) return E_INVALIDARG; wstring strMsg; strMsg = strMsg + pDispParams->rgvarg[0].bstrVal + L", "; strMsg = strMsg + pDispParams->rgvarg[1].bstrVal + L", "; strMsg = strMsg + pDispParams->rgvarg[2].bstrVal + L"."; MessageBox(strMsg.c_str(), L"UserDispparams", 0x20); return S_OK;}2> DISPPARAMS配合BSTR使用，在调用的函数中释放释放内存LRESULT CMainDlg::OnOK(WORD /*wNotifyCode*/, WORD wID, HWND /*hWndCtl*/, BOOL& /*bHandled*/){ // TODO: Add validation code DISPPARAMS param; param.cArgs = 3; param.cNamedArgs = 0; param.rgdispidNamedArgs = NULL; param.rgvarg = new VARIANTARG[3]; param.rgvarg[0].vt = VT_BSTR; param.rgvarg[0].bstrVal = CComBSTR(L"A000").Detach(); param.rgvarg[1].vt = VT_BSTR; param.rgvarg[1].bstrVal = CComBSTR(L"A111").Detach(); param.rgvarg[2].vt = VT_BSTR; param.rgvarg[2].bstrVal = CComBSTR(L"A222").Detach(); UserDispparams(&param); delete [] param.rgvarg; CloseDialog(wID); return 0;}// ... ...HRESULT CMainDlg::UserDispparams(DISPPARAMS* pDispParams){ if (!pDispParams) return E_INVALIDARG; if (3 != pDispParams->cArgs) return E_INVALIDARG; wstring strMsg; CComBSTR bstr0, bstr1, bstr2; bstr0.Attach(pDispParams->rgvarg[0].bstrVal); bstr1.Attach(pDispParams->rgvarg[1].bstrVal); bstr2.Attach(pDispParams->rgvarg[2].bstrVal); strMsg += bstr0; strMsg += L", "; strMsg += bstr1; strMsg += L", "; strMsg += bstr2; strMsg += L"."; MessageBox(strMsg.c_str(), L"UserDispparams", 0x20); return S_OK;} 3> DISPPARAMS配合SAFEARRAY的使用，利用CComSafeArray来管理内存LRESULT CMainDlg::OnOK(WORD /*wNotifyCode*/, WORD wID, HWND /*hWndCtl*/, BOOL& /*bHandled*/){ // TODO: Add validation code DISPPARAMS param; param.cArgs = 4; param.cNamedArgs = 0; param.rgdispidNamedArgs = NULL; param.rgvarg = new VARIANTARG[4]; param.rgvarg[0].vt = VT_BSTR; param.rgvarg[0].bstrVal = CComBSTR(L"A000").Detach(); param.rgvarg[1].vt = VT_BSTR; param.rgvarg[1].bstrVal = CComBSTR(L"A111").Detach(); param.rgvarg[2].vt = VT_BSTR; param.rgvarg[2].bstrVal = CComBSTR(L"A222").Detach(); CComSafeArray<BSTR> sa; sa.Add(CComBSTR(L"B000").Detach()); sa.Add(CComBSTR(L"B111").Detach()); sa.Add(CComBSTR(L"B222").Detach()); param.rgvarg[3].vt = VT_ARRAY; param.rgvarg[3].parray = sa.Detach(); UserDispparams(&param); delete [] param.rgvarg; _CrtDumpMemoryLeaks(); CloseDialog(wID); return 0;}HRESULT CMainDlg::UserDispparams(DISPPARAMS* pDispParams){ if (!pDispParams) return E_INVALIDARG; if (4 != pDispParams->cArgs) return E_INVALIDARG; wstring strMsg; CComBSTR bstrA0, bstrA1, bstrA2; CComBSTR bstrB0, bstrB1, bstrB2; CComSafeArray<BSTR> sa; bstrA0.Attach(pDispParams->rgvarg[0].bstrVal); bstrA1.Attach(pDispParams->rgvarg[1].bstrVal); bstrA2.Attach(pDispParams->rgvarg[2].bstrVal); sa.Attach(pDispParams->rgvarg[3].parray); bstrB0.Attach(sa.GetAt(0)); bstrB1.Attach(sa.GetAt(1)); bstrB2.Attach(sa.GetAt(2)); strMsg += bstrA0; strMsg += L", "; strMsg += bstrA1; strMsg += L", "; strMsg += bstrA2; strMsg += L"."; strMsg += bstrB0; strMsg += L", "; strMsg += bstrB1; strMsg += L", "; strMsg += bstrB2; strMsg += L"."; MessageBox(strMsg.c_str(), L"UserDispparams", 0x20); return S_OK;}--END--