VC编写的DLL中导出函数在VB的调用简单一问

[hongzhh]

我在VC编写的DLL函数中要将一取的字符串传给VB，传纯英文或者数字字符串可以，但是中文的不行？为什么不明白，请告知
VC 函数

DWORD MyTest(char *str)
{
CString strtmp="中华人民共和国"

memcpy(str,strtmp.GetBuffer(0),strtmp.GetLeng());
return 0;
}
VB中调用
Public Declare Function MyTestLib "MyTestDLL.dll" (Value As Any) As Long

[difa]

Pulic Function MyTestLib "MyTestDLL.dll" (byref buffer as byte) As Long

'
Dim Buffer[100] as byte
Dim i as Ling
i=MyTestLib(Buffer[0]);