SAFEARRAY使用方法示例

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;