CallingConvention 枚举
重要
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指定调用在非托管代码中实现的方法所需的调用约定。
public enum class CallingConventionC#
public enum CallingConventionC#
[System.Serializable]
public enum CallingConventionC#
[System.Serializable]
[System.Runtime.InteropServices.ComVisible(true)]
public enum CallingConventiontype CallingConvention = [<System.Serializable>]
type CallingConvention = [<System.Serializable>]
[<System.Runtime.InteropServices.ComVisible(true)>]
type CallingConvention = Public Enum CallingConvention- 继承
- 属性
| 名称 | 值 | 说明 |
|---|---|---|
| Cdecl | 2 | 调用方清理堆栈。 这使你能够调用具有 |
| FastCall | 5 | 不支持此调用约定。 |
| StdCall | 3 | 被调用方清理堆栈。 |
| ThisCall | 4 | 第一个参数是 |
| Winapi | 1 | 此成员实际上不是调用约定，而是使用 默认的平台调用约定。 |
以下示例演示如何应用 Cdecl 调用约定，由于堆栈由调用方清理，因此必须使用该约定。
using namespace System;
using namespace System::Runtime::InteropServices;
private ref class NativeMethods
{
public:
// CallingConvention.Cdecl must be used since the stack is
// cleaned up by the caller.
// int printf( const char *format [, argument]... )
[DllImport("msvcrt.dll", CharSet = CharSet::Unicode, CallingConvention = CallingConvention::Cdecl)]
static int printf(String^ format, int i, double d);
[DllImport("msvcrt.dll", CharSet = CharSet::Unicode, CallingConvention = CallingConvention::Cdecl)]
static int printf(String^ format, int i, String^ s);
};
int main()
{
NativeMethods::printf("\nPrint params: %i %f", 99, 99.99);
NativeMethods::printf("\nPrint params: %i %s", 99, "abcd");
}
C#
using System;
using System.Runtime.InteropServices;
internal static class NativeMethods
{
// C# doesn't support varargs so all arguments must be explicitly defined.
// CallingConvention.Cdecl must be used since the stack is
// cleaned up by the caller.
// int printf( const char *format [, argument]... )
[DllImport("msvcrt.dll", CharSet = CharSet.Unicode, CallingConvention = CallingConvention.Cdecl)]
internal static extern int printf(String format, int i, double d);
[DllImport("msvcrt.dll", CharSet = CharSet.Unicode, CallingConvention = CallingConvention.Cdecl)]
internal static extern int printf(String format, int i, String s);
}
public class App
{
public static void Main()
{
NativeMethods.printf("\nPrint params: %i %f", 99, 99.99);
NativeMethods.printf("\nPrint params: %i %s", 99, "abcd");
}
}
Imports System.Runtime.InteropServices
Friend Class NativeMethods
' Visual Basic does not support varargs, so all arguments must be
' explicitly defined. CallingConvention.Cdecl must be used since the stack
' is cleaned up by the caller.
' int printf( const char *format [, argument]... )
<DllImport("msvcrt.dll", CharSet:=CharSet.Unicode, CallingConvention:=CallingConvention.Cdecl)>
Friend Overloads Shared Function printf(
ByVal format As String, ByVal i As Integer, ByVal d As Double) As Integer
End Function
<DllImport("msvcrt.dll", CharSet:=CharSet.Unicode, CallingConvention:=CallingConvention.Cdecl)>
Friend Overloads Shared Function printf(
ByVal format As String, ByVal i As Integer, ByVal s As String) As Integer
End Function
End Class
Public Class App
Public Shared Sub Main()
NativeMethods.printf(ControlChars.CrLf + "Print params: %i %f", 99, 99.99)
NativeMethods.printf(ControlChars.CrLf + "Print params: %i %s", 99, "abcd")
End Sub
End Class
始终使用 CallingConvention 枚举而不是 CALLCONV 枚举在托管代码中指定调用约定。 后者仅用于 COM 定义。 枚举 CallingConvention 由 DllImportAttribute 和 中的 System.Reflection.Emit 多个类用于动态发出平台调用签名。
| 产品 | 版本 |
|---|---|
| .NET | Core 1.0, Core 1.1, Core 2.0, Core 2.1, Core 2.2, Core 3.0, Core 3.1, 5, 6, 7, 8, 9 |
| .NET Framework | 1.1, 2.0, 3.0, 3.5, 4.0, 4.5, 4.5.1, 4.5.2, 4.6, 4.6.1, 4.6.2, 4.7, 4.7.1, 4.7.2, 4.8, 4.8.1 |
| .NET Standard | 1.1, 1.2, 1.3, 1.4, 1.5, 1.6, 2.0, 2.1 |
| UWP | 10.0 |
