vb.net 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

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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

如何把下面用vb.net語言編寫的代碼改成c#

給你個網(wǎng)站看

可在線將vb.net代碼轉(zhuǎn)成c＃的，我用過，還可以的，但是轉(zhuǎn)后也要改動一些。這里還有將c＃轉(zhuǎn)vb.net的。

這是我轉(zhuǎn)的：

string[] ArrValue = new string[43];

int Nums;

public void Page_Load(object Sender, EventArgs E)

{

int I;

if (!IsPostBack) {

for (I = 1900; I = 2101; I++) {

ListItem IItem = new ListItem();

IItem.Text = (string)I;

if (I == Year(Now)) {

IItem.Selected = "True";

}

DropYear.items.add(IItem);

}

for (I = 1; I = 12; I++) {

ListItem IItem = new ListItem();

IItem.Text = (string)I;

if (I == Month(Now)) {

IItem.Selected = "True";

}

DropMonth.items.add(IItem);

}

}

DispDetail(Conversion.Val(DropYear.SelectedItem.Text), Conversion.Val(DropMonth.SelectedItem.Text));

}

public void DispDetail(int YYear, int MMonth)

{

System.DateTime theDate;

int theYear;

int theMonth;

int theDay;

int theWeek;

int theFirstNum;

int NumOfMonth;

int i;

string theStr;

theYear = YYear;

theMonth = MMonth;

theDay = 1;

//獲得所要查詢的月的第一天日期

theDate = DateSerial(theYear, theMonth, theDay);

//確定所要查詢的第一天是星期幾

theWeek = weekday(theDate);

theFirstNum = theWeek;

//確定所要查詢的月的天數(shù)

NumOfMonth = GetDayNum(theyear, themonth);

for (i = 0; i = 41; i++) {

ArrValue(i) = "";

}

for (i = 0; i = NumOfMonth - 1; i++) {

ArrValue(theFirstNum - 1 + i) = i + 1;

}

}

public object GetDayNum(int YYear, int MMonth)

{

object functionReturnValue = null;

if (MMonth == 1 | MMonth == 3 | MMonth == 5 | MMonth == 7 | MMonth == 8 | MMonth == 10 | MMonth == 12) {

functionReturnValue = 31;

}

else {

if (MMonth == 4 | MMonth == 6 | MMonth == 9 | MMonth == 11) {

functionReturnValue = 30;

}

else {

if (((YYear % 4 == 0) (YYear % 100 != 0)) | (YYear % 400 == 0)) {

functionReturnValue = 29;

}

else {

functionReturnValue = 28;

}

}

}

return functionReturnValue;

}

vb.net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(dǎo)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：

如何在vb.net調(diào)用c程序

------------------------------------------00000000000000000000000000++++++++++++++++++

怎樣將VB代碼換成C

可以試試VBto Converter

VBto Converter是一款VB語言轉(zhuǎn)換軟件，它支持將MS Visual Basic資源文件（包括源代碼）轉(zhuǎn)換成MS VC++ MFC, VC++.NET (CLR), VBNET, C#, J#, Borland C++ Builder, Borland Delphi源文件。