C語言轉(zhuǎn)換為VB.NET

Option Explicit On

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Option Strict On

Imports System

Module Program

Sub Main()

Dim y,m,t As Integer

begin:

' 輸入數(shù)據(jù)時一行一個

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

vb點虐 調(diào)用C語言可執(zhí)行程序并傳值？

在c語言中每一個變量都有兩個屬性一個是值，一個是址。比如inta=2;變量a的值是2，變量a的地址，可以用取地址

操作符

獲取，即a。因此以C語言的函數(shù)傳遞中具備兩種方式傳遞參數(shù)，一種是傳址，一種傳值。比如voidf1(intv){;}//函數(shù)f1v

vb點虐 如何與c語言做的dll互相傳遞字符串

首先是C的DLL（我的項目叫ConsoleApplication2.dll）：

#include?Windows.h

//?導出Test函數(shù)，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項目：

Imports?System.Runtime.InteropServices

Imports?System.Text

Module?Module1

REM?生成的是ConsoleApplication2.dll，名字與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

運行結(jié)果：