c++调用excel 修改图例类型的com接口，提示内存访问冲突

Question

我使用C++ 的方式调用excel的com接口， 在新增表格的时候会提示访问冲突，这个为什么呢 ？

#include "stdafx.h"
#include <atlcomcli.h>

int _tmain(int argc, _TCHAR* argv[])
{
    CoInitialize(NULL);

    _ApplicationPtr pExcelApp;
    HRESULT hr = pExcelApp.CreateInstance(__uuidof(Excel::Application));

    if(SUCCEEDED(hr))
    {
        pExcelApp->put_Visible(0, VARIANT_FALSE);
        _WorkbookPtr pWorkbook = pExcelApp->Workbooks->Open(_T("C:\\Users\\pc\\Desktop\\2.xlsx"));
        if(pWorkbook)
        {
            SheetsPtr sheets = pWorkbook->GetSheets();
            _WorksheetPtr wSheet = (_WorksheetPtr)sheets->GetItem(1);

            ChartObjectsPtr chartObjects = (ChartObjectsPtr)wSheet->ChartObjects(vtMissing);
            ChartObjectPtr myChart = chartObjects->Add(100, 200, 400, 300);
            
            _Chart* chart = myChart->GetChart();
            chart->PutChartType(Excel::XlChartType::xlLine);    //代码运行到此处会提示访问冲突 

            pWorkbook->Close();
            pExcelApp->Quit();
        }
    }
    ::CoUninitialize();
    return 0;
}

Answer 1

检查一下指针哇~