SetOaNoCache在哪里定义？

Question

尝试禁用 BSTR缓存：

SetOaNoCache();

VC ++编译器构建输出：

• 'SetOaNoCache': identifier not found

不想要使用：

• OANOCACHE = 1

问题：

• SetOaNoCache 定义的位置 - 头文件？

Answer 1

它没有在头文件中定义，它在OLEAUT32.dll中。你可以这样称呼它：

typedef int (*SETOANOCACHE)(void);


void DisableBSTRCache()
{
    HINSTANCE hLib = LoadLibrary("OLEAUT32.DLL");
    if (hLib != NULL)
    {
        SETOANOCACHE SetOaNoCache = (SETOANOCACHE)GetProcAddress(hLib, "SetOaNoCache");
        if (SetOaNoCache != NULL)
            SetOaNoCache();
        FreeLibrary(hLib);
    }
}

Answer 2

不是。来自C ++ Builder附带的Win32 API库：

Requirements

Windows XP: Requires Windows XP Service Pack 2 or later.

Windows 95/98: Not supported.

Header: Not supplied. Declare prototype as shown.

Library: Use oleaut32.lib.

原型如图所示：

inline void TurnOffCache ()
{
// Function prototype.
extern "C" SetOaNoCache(); 
// Turn off BSTR caching.
SetOaNoCache();
}