继续深入C#调用win32 API的学习

找到几篇好文章

暴强贴：从.NET平台调用Win32 API 作者：刘铁猛

Calling Win32 DLLs in C# with P/Invoke

为什么是static extern 类型

上面这篇文章讲的不错

Now, notice that the MessageBeep method was declared as static. This is a requirement for P/Invoke methods because there is no consistent notion of an instance in the Windows API.

Next, notice that the method is marked as extern. This is your hint to the compiler that you mean for the method to be implemented by a function exported from a DLL, and therefore there is no need for you to supply a method body.

遇到里面的类型怎么解决呢？

1、非指针类型

Win32 Types	Specification	CLR Type
char, INT8, SBYTE, CHARâ€	8-bit signed integer	System.SByte
short, short int, INT16, SHORT	16-bit signed integer	System.Int16
int, long, long int, INT32, LONG32, BOOL†, INT	32-bit signed integer	System.Int32
__int64, INT64, LONGLONG	64-bit signed integer	System.Int64
unsigned char, UINT8, UCHAR†, BYTE	8-bit unsigned integer	System.Byte
unsigned short, UINT16, USHORT, WORD, ATOM, WCHAR†, __wchar_t	16-bit unsigned integer	System.UInt16
unsigned, unsigned int, UINT32, ULONG32, DWORD32, ULONG, DWORD, UINT	32-bit unsigned integer	System.UInt32
unsigned __int64, UINT64, DWORDLONG, ULONGLONG	64-bit unsigned integer	System.UInt64
float, FLOAT	Single-precision floating point	System.Single
double, long double, DOUBLE	Double-precision floating point	System.Double
†In Win32 this type is an integer with a specially assigned meaning; in contrast, the CLR provides a specific type devoted to this meaning. 2，指针类型 这就涉及到其实在C#中，String类型是传引用的，见此博客解释/article/4848274.html 还有专业解释http://msdn.microsoft.com/en-us/library/0f66670z(VS.71).aspx 故有 // ** Documentation for Win32 GetShortPathName() API Function // DWORD GetShortPathName( // LPCTSTR lpszLongPath, // file for which to get short path // LPTSTR lpszShortPath, // short path name (output) // DWORD cchBuffer // size of output buffer // ); [DllImport("Kernel32", CharSet = CharSet.Auto)] static extern Int32 GetShortPathName( String path, // input string StringBuilder shortPath, // output string Int32 shortPathLength); // StringBuilder.Capacity

Platform Invoke Tutorial