C++怎么用COleSafeArray将字符串写入excel中

要使用`COleSafeArray`将字符串写入Excel中，您需要遵循以下步骤：

1. 引入必要的头文件：

#include 
#include 

2. 创建一个`COleVariant`对象来存储要写入的字符串值：

CString strValue = "https://www.yisu.com/ask/Hello, World!";
COleVariant var(strValue);

3. 将`COleVariant`对象转换为`COleSafeArray`对象：

COleSafeArray sa;
sa.CreateOneDim(VT_VARIANT, 1);
LONG index[] = {0};
sa.PutElement(index, &var);

4. 打开Excel应用程序并获取`IDispatch`接口指针：

_Application app;
app.CreateDispatch("Excel.Application");

5. 打开或创建一个工作簿：

Workbooks workbooks = app.GetWorkbooks();
_Workbook workbook;
workbooks.Open(L"C:\\path\\to\\Workbook.xlsx", NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, 
NULL, NULL, NULL);
// 如果要创建新的工作簿，请使用下面的代码：
// _Workbook workbook = workbooks.Add();

6. 获取工作表对象：

Sheets sheets = workbook.GetSheets();
_Worksheet sheet;
sheet = sheets.GetItem(COleVariant((short)(1)));

7. 将字符串值写入单元格：

Range range;
range = sheet.GetCells();
range = range.GetItem(COleVariant((long)(1)), COleVariant((long)(1)));
range.SetValue(COleVariant(sa));

8. 保存并关闭工作簿：

workbook.Save();
workbook.Close();

9. 退出Excel应用程序：

app.Quit();

完整的示例代码如下：

#include 
#include 
int main() {
    CoInitialize(NULL);
    CString strValue = "https://www.yisu.com/ask/Hello, World!";
    COleVariant var(strValue);
    COleSafeArray sa;
    sa.CreateOneDim(VT_VARIANT, 1);
    LONG index[] = {0};
    sa.PutElement(index, &var);
    _Application app;
    app.CreateDispatch("Excel.Application");
    Workbooks workbooks = app.GetWorkbooks();
    _Workbook workbook;
    workbooks.Open(L"C:\\path\\to\\Workbook.xlsx", NULL, NULL, NULL, NULL, NULL, NULL, NULL, NULL, 
    NULL, NULL, NULL, NULL);
    //_Workbook workbook = workbooks.Add();
    Sheets sheets = workbook.GetSheets();
    _Worksheet sheet;
    sheet = sheets.GetItem(COleVariant((short)(1)));
    Range range;
    range = sheet.GetCells();
    range = range.GetItem(COleVariant((long)(1)), COleVariant((long)(1)));
    range.SetValue(COleVariant(sa));
    workbook.Save();
    workbook.Close();
    app.Quit();
    CoUninitialize();
    return 0;
}

请确保已经链接到`ole32.lib`和`afxdisp.lib`库，并将文件路径替换为实际的Excel工作簿路径。