我创建了一个C++ DLL,它将空数组作为VARIANT。我将在DLL中运行一些sql查询,并将输出存储在空数组中。当我尝试此操作时,excel崩溃。
我的VBA电话:
Dim outArray(17) As Variant
bo = GetData_V(dbFilePath, id, inArray, outArray, counter)
功能定义为
Declare Function GetData_V& Lib "xyz.dll" (ByVal path As String, ByRef inputArr() As String, ByRef output As Variant, ByRef id As Integer)
C++实现:
CComSafeArray<VARIANT> out_sa(nCount);
HRESULT hr;
for (LONG i = lowerBound; i <= upperBound; i++)
{
CComVariant variant = CComVariant(outputCustom[i]);
hr = out_sa.SetAt(i,variant);
if (FAILED(hr))
{
return false;
}
}
CComVariant(out_sa).Detach(outputArray);
其中outputCustom被定义为
outputCustom = new char*[nCount+1];
并具有字符串值。
当我尝试运行它时,Excel崩溃。我不知道如何将outputArray返回到VBA。
最佳答案
这就是我将String数组从C++ DLL
返回到VBA
的方式:
我将VBA
函数声明更改为:
Declare Function GetData_V Lib "xyz.dll" (ByVal path As String, ByVal id As String, ByRef inputArr() As String, ByRef output() As String) As Variant()
C++实现:
将
C++
函数的返回类型更改为SAFEARRAY*
,并修改了代码,如下所示: SafeArrayLock(*outputArray);
for (LONG i = 0; i < countElements; i++)
{
CComBSTR bstr = CComBSTR(outputCustom[i]);
SafeArrayPutElement(*outputArray, &i, bstr);
}
SafeArrayUnlock(*outputArray);
delete [] outputCustom;
return *outputArray;
关于c++ - 将字符串数组从C++ DLL返回到VBA(Excel),我们在Stack Overflow上找到一个类似的问题:https://stackoverflow.com/questions/47504575/