How to pass the string in the dll written by vc to vb?

鱼松卷

It doesn’t work for a long time, please help! Write a small example for me

zdl_22

__stdcall int CALLBACK CalcSum(int a,int b,char *c);

You can declare in vb:
Private Declare Function MySum Lib "d:\MyDLL.dll" (ByVal S As Integer, ByVal D As Integer, ByRef c as string) As Integer

answer203

In VC, the BSTR type corresponds to the STRING type in VB.

starfalling

Note that the string type in VC uses wide characters, otherwise it will not match. Because VB uses unicode encoding. Also, the rows and columns of the two-dimensional arrays of VB and VC are just reversed. It is best not to write DLLs in the two-dimensional array format.

招财猫

Just use stdcall, other methods are the same as calling ordinary api