如何使用EuCOM在Euphoria中创建BSTR的变体数组



到目前为止,我已经学会了如何使用Typelib在Euphoria DLL之间传递Unicode字符串bSTR。到目前为止,我还不知道如何创建和传递一个BSTR数组。

到目前为止,我的代码(以及EuCOM本身和Win32lib部分的include):

global function REALARR()
  sequence seq
  atom psa
  atom var
  seq = { "cat","cow","wolverine" }
  psa = create_safearray( seq, VT_BSTR )
  make_variant( var, VT_ARRAY + VT_BSTR, psa )
  return var
end function

typelib的一部分是:

  [
     helpstring("get an array of strings"), 
     entry("REALARR")
  ] 
  void __stdcall REALARR( [out,retval] VARIANT* res );

VB6中的测试代码是:

...
Dim v() as String
V = REALARR()
...

到目前为止,我所得到的只是DLL中的一个错误"0"。有什么想法吗?任何人

您应该使用create_safearray()函数。它记录在实用程序下(隐藏?)。基本上,将BSTR指针放入一个序列中,并将其传递给create_safearray():

sequence s, bstrs
s = {"A", "B"}
bstrs = {}
for i = 1 to length(s) do
    bstrs &= alloc_bstr( s[i] )
end for
atom array
array = create_safearray( bstrs, VT_BSTR )
...
destroy_safearray( array )

我已经通过他们的论坛与Euphoria的人们取得了联系,并且已经走到了这一步。例程在make_variant行失败。我还没有想清楚,他们也没有。

global function REALARR() 
  atom psa 
  atom var 
  atom bounds_ptr 
  atom dim 
  atom bstr 
  object void 
  dim = 1 
  bounds_ptr = allocate( 8 * dim ) -- now figure out which part is Extent and which is LBound 
  poke4( bounds_ptr, { 3, 0 } ) -- assuming Extent and LBound in that order 
  psa = c_func( SafeArrayCreate, { VT_BSTR, 1, bounds_ptr } ) 
  bstr = alloc_bstr( "cat" ) 
  poke4( bounds_ptr, 0 ) 
  void = c_func( SafeArrayPutElement, {psa, bounds_ptr, bstr}) 
  free_bstr( bstr ) 
  bstr = alloc_bstr( "cow" ) 
  poke4( bounds_ptr, 1 ) 
  void = c_func( SafeArrayPutElement, {psa, bounds_ptr, bstr}) 
  free_bstr( bstr ) 
  bstr = alloc_bstr( "wolverine" ) 
  poke4( bounds_ptr, 2 ) 
  void = c_func( SafeArrayPutElement, {psa, bounds_ptr, bstr}) 
  free_bstr( bstr ) 
  make_variant( var, VT_ARRAY + VT_BSTR, psa )  
  return var 
end function 

好的,var尚未初始化。这并不重要,因为常规程序仍然崩溃。尽管如此,还是需要

var = allocate( 16 )

就在make_variant 之前

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