CComVariant :: Detach()失败 [英] CComVariant::Detach() fails

问题描述

以下代码失败:

CString s;
dialogpointer-> GetWindowText(s);
CComVariant(s).Detach(NameVariantPointer);

但是以下方法可以正常工作:

CString s;
dialogpointer-> GetWindowText(s);
CComVariant var(s);
NameVariantPointer-> bstrVal = var.bstrVal;

the following code fails:

CString s;
dialogpointer->GetWindowText(s);
CComVariant(s).Detach(NameVariantPointer);

But the following works fine:

CString s;
dialogpointer->GetWindowText(s);
CComVariant var(s);
NameVariantPointer->bstrVal = var.bstrVal;

推荐答案

0)传递的指针不能为NULL :)
1)引用的VARIANT必须初始化:):

0) The passed pointer may not be NULL :)
1) The referenced VARIANT must be initialized :) :

{
  VARIANT vTest = {0};
  CComVariant(_T("test")).Detach(&vTest);
...
}

谢谢您的解答.您的解决方案运行完美.

Thanks for the answer.Your solution worked perfectly.

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