SAFEARRAY使用方法示例

From: http://blog.csdn.net/absurd/article/details/786822

 

SAFEARRAY使用方法示例

 

SAFEARRAY不是很好用，一些函数不太直观，一不小心就着了它的道。上次学习编写Google桌面插件时就遇到了麻烦，本来应该是vsa.vt = VT_ARRAY | VT_BSTR，结果写成了vsa.vt = VT_ARRAY，让我查了好久才找到原因。这里整理一下，作为备忘。

 

l         创建

long i = 0;                             VARIANT va = {0};                             va.vt = VT_BSTR;                                                         SAFEARRAYBOUND bounds[1] = {0};                             bounds[0].cElements = 5;                             SAFEARRAY* psa = SafeArrayCreate(VT_VARIANT, 1, bounds);

 

l         存入元素

for(i = 0; i < 5; i++)                             {                                      va.bstrVal = SysAllocString(L"test");                                      SafeArrayPutElement(psa, &i, &va);                             }

 

l         获取元素

for(i = 0; i < 5; i++)                             {                                      va.bstrVal = SysAllocString(L"test");                                      SafeArrayGetElement(psa, &i, &va);                                      SysFreeString(va.bstrVal);                             }

 

l         销毁

SafeArrayDestroy(psa);

 

l         生成VARIANT变量

VARIANT vsa = {0};                             vsa.vt = VT_ARRAY | VT_BSTR;                             vsa.parray = psa;