Option Explicit On
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Option Strict On
Imports System
Module Program
Sub Main()
Dim y,m,t As Integer
begin:
' 输入数据时一行一个
y=CInt(Console.ReadLine())
m=CInt(Console.ReadLine())
t=CInt(Console.ReadLine())
If y
200 Then
Console.WriteLine("ERROR")
goto begin
End If
pr(y,m,t)
Console.Write("Press any key to continue . . . ")
Console.ReadKey(True)
End Sub
Function pr(y As Integer,m As Integer,t As Integer) As Integer
Dim ye,[Me],i As Integer
ye=CInt((m+t-2)/12+y)
[Me]=(m+t-2) Mod 12+1
End If
End Function
Function mday(y As Integer,m As Integer) As Integer
Dim day As Integer()={0,31,28,31,30,31,30,31,31,30,31,30,31}
Dim ad As I
在c语言中每一个变量都有两个属性一个是值，一个是址。比如inta=2;变量a的值是2，变量a的地址，可以用取地址
操作符
获取，即a。因此以C语言的函数传递中具备两种方式传递参数，一种是传址，一种传值。比如voidf1(intv){;}//函数f1v
首先是C的DLL（我的项目叫ConsoleApplication2.dll）：
#include Windows.h
// 导出Test函数，供外部使用
extern "C" __declspec(dllexport) BSTR __cdecl Test(LPSTR p);
BOOL WINAPI DllMain(
HINSTANCE hinstDLL,
DWORD fdwReason,
LPVOID lpReserved)
{
switch (fdwReason)
{
case DLL_PROCESS_ATTACH: break;
case DLL_THREAD_ATTACH: break;
case DLL_THREAD_DETACH: break;
case DLL_PROCESS_DETACH: break;
}
return TRUE;
}
BSTR __cdecl Test(LPSTR p)
{
p[0] = 'X';
return SysAllocString((BSTR)p);
}
然后是VB.Net项目：
Imports System.Runtime.InteropServices
Imports System.Text
Module Module1
REM 生成的是ConsoleApplication2.dll，名字与C里面相同
DllImport("ConsoleApplication2.dll", CharSet:=CharSet.Auto, CallingConvention:=CallingConvention.Cdecl)
Public Function Test(MarshalAs(UnmanagedType.LPTStr) ByVal str As StringBuilder) As MarshalAs(UnmanagedType.BStr) String
End Function
Sub Main()
Dim str As StringBuilder = New StringBuilder("Hello")
Dim rstr As String = Test(str)
Console.WriteLine(rstr)
Console.ReadKey()
End Sub
End Module
运行结果：