初始化出错

Question

BSTR* bstrName;
  _bstr_t bstrValue1(_T("Select * from [mydata] where age <12.000000 and score < 90"));
    *bstrName = bstrValue1.copy();    //这里提示:    run_time check failure #3 -the variable 'bstrName' is being used without being initialized.

上面代码运行出错，编译没有问题

Answer 1

BSTR* bstrName;
  _bstr_t bstrValue1(_T("Select * from [mydata] where age <12.000000 and score < 90"));
    *bstrName = bstrValue1.copy();    //这里提示:    run_time check failure #3 -the variable 'bstrName' is being used without being initialized.

上面代码运行出错，编译没有问题

试试看给

BSTR* bstrName 变量初值

 

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Answer 2

錯誤訊息表示 the variable 'bstrName' is being used without being initialized

你只有宣告 BSTR* bstrName 但是並沒有初始化資料

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Answer 3

BSTR* bstrName;
  _bstr_t bstrValue1(_T("Select * from [mydata] where age <12.000000 and score < 90"));
    *bstrName = bstrValue1.copy();    //这里提示:    run_time check failure #3 -the variable 'bstrName' is being used without being initialized.

上面代码运行出错，编译没有问题

VC++程序现在非常严格规定任何指针在使用前必须赋值。所以请这样修改：

BSTR* bstrName =NULL;

或者直接这样做：

bstr_t bstrValue1(_T("Select * from [mydata] where age <12.000000 and score < 90"));
    BSTR* bstrName = bstrValue1.copy();   

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