将托管 (C#) string[] 数组传递到 COM DLL
设置:
我有一个 COM DLL,它调用托管 C# DLL 内的方法。 此函数返回一个 C# string[] 数组,该数组被封送至 SAFEARRAY。
问题:
当我尝试访问 safearray 中的字符串时,我只得到字符串的第一个字符。 我究竟做错了什么?
代码:
// Pointer to the managed interface
DatabasePtr pODB(__uuidof(DBClass));
// Get the string[] array from the managed method
SAFEARRAY* safearray = pODB->GetStringArray();
HRESULT hresult;
long ubound;
long lbound;
hresult = SafeArrayGetUBound(safearray, 1, &ubound);
hresult = SafeArrayGetLBound(safearray, 1, &lbound);
long index;
BSTR fromarray;
for (; lbound <= ubound; lbound++)
{
index = lbound;
hresult = SafeArrayGetElement(safearray, &index, (void*)&fromarray);
char buffer[512];
sprintf_s(buffer,"%s",fromarray);
MessageBox(0, (LPCSTR)buffer, "...", 0);
}
感谢您的帮助,
-肖恩!
Setup:
I have a COM DLL that calls a method inside a managed C# DLL. This function returns a C# string[] array, which is marshaled to a SAFEARRAY.
Problem:
When I try to access the strings within the safearray I only get the first char of the string. What am I doing wrong?
The code:
// Pointer to the managed interface
DatabasePtr pODB(__uuidof(DBClass));
// Get the string[] array from the managed method
SAFEARRAY* safearray = pODB->GetStringArray();
HRESULT hresult;
long ubound;
long lbound;
hresult = SafeArrayGetUBound(safearray, 1, &ubound);
hresult = SafeArrayGetLBound(safearray, 1, &lbound);
long index;
BSTR fromarray;
for (; lbound <= ubound; lbound++)
{
index = lbound;
hresult = SafeArrayGetElement(safearray, &index, (void*)&fromarray);
char buffer[512];
sprintf_s(buffer,"%s",fromarray);
MessageBox(0, (LPCSTR)buffer, "...", 0);
}
Thanks for your help,
-Sean!
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评论(1)
BSTR 是 unicode 字符串,因此您必须使用
wchar_t
缓冲区和wsprintf_s
。 现在你打印第一个 unicode 字符的 ANSI 部分,然后停在 \0 上。 拜托,拜托,不要像那样堆栈溢出(原文如此!)。 使用安全的_vsnwprintf_s_l
及其系列,您的代码现在是黑客的最爱,您将被破解。 请参阅 http://msdn.microsoft.com/en-我们/库/d3xd30zz(VS.80).aspxThe BSTR is an unicode string, so you must use an
wchar_t
buffer and thewsprintf_s
. Right now u print the ANSI part of the first unicode character then stop on the \0. And please, please, don't stack overflow like that (sic!). Use the safe_vsnwprintf_s_l
and its family, your code is a hacker's delight as it is right now and u'll be pwned. See http://msdn.microsoft.com/en-us/library/d3xd30zz(VS.80).aspx