http://www.sosuo8.com/article-2012/dllleixingzhuanhuan.htm
在合作开发时，C#时常需要调用C++DLL，当传递参数时时常遇到问题，尤其是传递和返回字符串是，现总结一下，分享给大家：
VC++中主要字符串类型为：LPSTR,LPCSTR, LPCTSTR, string, CString, LPCWSTR,
LPWSTR等
但转为C#类型却不完全相同。
主要有如下几种转换：
将string转为IntPtr：IntPtr
System.Runtime.InteropServices.Marshal.StringToCoTaskMemAuto(string)
将IntPtr转为string：string
System.Runtime.InteropServices.MarshalPtrToStringAuto(IntPtr)
类型对照：
BSTR
--------- StringBuilder
LPCTSTR --------- StringBuilder
LPCWSTR
--------- IntPtr
handle---------IntPtr
hwnd-----------IntPtr
char
*----------string
int * -----------ref int
int &-----------ref int
void *----------IntPtr
unsigned char *-----ref byte
Struct需要在C#里重新定义一个Struct
CallBack回调函数需要封装在一个委托里，delegate static extern int FunCallBack(string str);
注意在每个函数的前面加上public
static extern +返回的数据类型,如果不加public
,函数默认为私有函数，调用就会出错。
|
API数据类型 |
类型描述 |
C#类型 |
|
WORD |
16位无符号整数 |
ushort |
|
LONG |
32位无符号整数 |
int |
|
DWORD |
32位无符号整数 |
uint |
|
HANDLE |
句柄,32位整数 |
int |
|
UINT |
32位无符号整数 |
uint |
|
BOOL |
32位布尔型整数 |
bool |
|
LPSTR |
指向字符的32位指针 |
string |
|
LPCSTR |
指向常字符的32位指针 |
String |
|
BYTE |
字节 |
byte |
|
CHAR |
字符 |
char |
|
DWORDLONG |
64位长整数 |
long |
|
HDC |
设备描述表句柄 |
int |
|
HGDIOBJ |
GDI对象句柄 |
int |
|
HINSTANCE |
实例句柄 |
int |
|
HWM |
窗口句柄 |
int |
|
HPARAM |
32位消息参数 |
int |
|
LPARAM |
32位消息参数 |
int |
|
WPARAM |
32位消息参数 |
int |
|
API |
C#数据类型 |
|
BOOL |
System.Int32 |
|
BOOLEAN |
System.Int32 |
|
BYTE |
System.UInt16 |
|
CHAR |
System.Int16 |
|
COLORREF |
System.UInt32 |
|
|
|
|
DWORD |
System.UInt32 |
|
DWORD32 |
System.UInt32 |
|
DWORD64 |
System.UInt64 |
|
FLOAT |
System.Float |
|
HACCEL |
System.IntPtr |
|
|
|
|
HANDLE |
System.IntPtr |
|
HBITMAP |
System.IntPtr |
|
HBRUSH |
System.IntPtr |
|
HCONV |
System.IntPtr |
|
HCONVLIST |
System.IntPtr |
|
|
|
|
HCURSOR |
System.IntPtr |
|
HDC |
System.IntPtr |
|
HDDEDATA |
System.IntPtr |
|
HDESK |
System.IntPtr |
|
HDROP |
System.IntPtr |
|
|
|
|
HDWP |
System.IntPtr |
|
HENHMETAFILE |
System.IntPtr |
|
HFILE |
System.IntPtr |
|
HFONT |
System.IntPtr |
|
HGDIOBJ |
System.IntPtr |
|
|
|
|
HGLOBAL |
System.IntPtr |
|
HHOOK |
System.IntPtr |
|
HICON |
System.IntPtr |
|
HIMAGELIST |
System.IntPtr |
|
HIMC |
System.IntPtr |
|
|
|
|
HINSTANCE |
System.IntPtr |
|
HKEY |
System.IntPtr |
|
HLOCAL |
System.IntPtr |
|
HMENU |
System.IntPtr |
|
HMETAFILE |
System.IntPtr |
|
|
|
|
HMODULE |
System.IntPtr |
|
HMONITOR |
System.IntPtr |
|
HPALETTE |
System.IntPtr |
|
HPEN |
System.IntPtr |
|
HRGN |
System.IntPtr |
|
|
|
|
HRSRC |
System.IntPtr |
|
HSZ |
System.IntPtr |
|
HWINSTA |
System.IntPtr |
|
HWND |
System.IntPtr |
|
INT |
System.Int32 |
|
|
|
|
INT32 |
System.Int32 |
|
INT64 |
System.Int64 |
|
LONG |
System.Int32 |
|
LONG32 |
System.Int32 |
|
LONG64 |
System.Int64 |
|
|
|
|
LONGLONG |
System.Int64 |
|
LPARAM |
System.IntPtr |
|
LPBOOL |
System.Int16[] |
|
LPBYTE |
System.UInt16[] |
|
LPCOLORREF |
System.UInt32[] |
|
|
|
|
LPCSTR |
System.String |
|
LPCTSTR |
System.String |
|
LPCVOID |
System.UInt32 |
|
LPCWSTR |
System.String |
|
LPDWORD |
System.UInt32[] |
|
|
|
|
LPHANDLE |
System.UInt32 |
|
LPINT |
System.Int32[] |
|
LPLONG |
System.Int32[] |
|
LPSTR |
System.String |
|
LPTSTR |
System.String |
|
|
|
|
LPVOID |
System.UInt32 |
|
LPWORD |
System.Int32[] |
|
LPWSTR |
System.String |
|
LRESULT |
System.IntPtr |
|
PBOOL |
System.Int16[] |
|
|
|
|
PBOOLEAN |
System.Int16[] |
|
PBYTE |
System.UInt16[] |
|
PCHAR |
System.Char[] |
|
PCSTR |
System.String |
|
PCTSTR |
System.String |
|
|
|
|
PCWCH |
System.UInt32 |
|
PCWSTR |
System.UInt32 |
|
PDWORD |
System.Int32[] |
|
PFLOAT |
System.Float[] |
|
PHANDLE |
System.UInt32 |
|
|
|
|
PHKEY |
System.UInt32 |
|
PINT |
System.Int32[] |
|
PLCID |
System.UInt32 |
|
PLONG |
System.Int32[] |
|
PLUID |
System.UInt32 |
|
|
|
|
PSHORT |
System.Int16[] |
|
PSTR |
System.String |
|
PTBYTE |
System.Char[] |
|
PTCHAR |
System.Char[] |
|
PTSTR |
System.String |
|
|
|
|
PUCHAR |
System.Char[] |
|
PUINT |
System.UInt32[] |
|
PULONG |
System.UInt32[] |
|
PUSHORT |
System.UInt16[] |
|
PVOID |
System.UInt32 |
|
|
|
|
PWCHAR |
System.Char[] |
|
PWORD |
System.Int16[] |
|
PWSTR |
System.String |
|
REGSAM |
System.UInt32 |
|
SC_HANDLE |
System.IntPtr |
|
|
|
|
SC_LOCK |
System.IntPtr |
|
SHORT |
System.Int16 |
|
SIZE_T |
System.UInt32 |
|
SSIZE_ |
System.UInt32 |
|
TBYTE |
System.Char |
|
|
|
|
TCHAR |
System.Char |
|
UCHAR |
System.Byte |
|
UINT |
System.UInt32 |
|
UINT32 |
System.UInt32 |
|
UINT64 |
System.UInt64 |
|
|
|
|
ULONG |
System.UInt32 |
|
ULONG32 |
System.UInt32 |
|
ULONG64 |
System.UInt64 |
|
ULONGLONG |
System.UInt64 |
|
USHORT |
System.UInt16 |
|
|
|
|
WORD |
System.Short |
|
WPARAM |
System.IntPtr |
c#调用c++ dll的几种类型（转）,布布扣,bubuko.com
原文：http://www.cnblogs.com/ein-key5205/p/3596511.html