(Reporter) How to Use C # To use Win32 DLL? (. NET) (C #) (Windows form)

Abstract
Due to the addition of C # and Visual Studio Tools, more and more people prefer to use C # To develop the GUI and then use MFC, however, in the past, too many programs have been developed using Visual C ++ 6.0 and MFC. At one time, it is impossible to change all C/C ++ code to C # later, therefore, organizing the business rule originally used in C/C ++ into a DLL for C # is not a good choice.

Introduction
Use environment: Visual Studio 2008

Step 1:

Create a project using Visual Studio 2008 and use the following Gui

Step 2:

Use(Reporter) How to Use Visual C ++ 6.0 to develop Win32 DLL? (C/C ++)Win32 DLL

Step 3:

Form1.cs/C #

 1   Using  System;
  2   Using System. Collections. Generic;
  3   Using  System. componentmodel;
  4   Using  System. Data;
  5   Using  System. drawing;
  6     Using  System. LINQ;
  7     Using System. text;
  8     Using  System. Windows. forms;
  9     Using  System. runtime. interopservices;
  10   
  11     Namespace  Pinvoke_win32_sum {
  12    Public     Partial     Class  Form1: FORM {
  13     Public  Form1 (){
  14   Initializecomponent ();
  15   }
  16   
  17  [Dllimport (  "  Win32_sum.dll  "  )]
  18     Private     Static     Extern     Int  Sum (  Int  X,  Int Y );
  19     Private     Void  Button#click (  Object  Sender, eventargs e ){
  20   Textbox3.text  =  Sum (convert. toint32 (textbox1.text), convert. toint32 (textbox2.text). tostring ();
  21   }
  22  }
  23   } 

9 rows

 
UsingSystem. runtime. interopservices;
 

When using the pinvoke (plateform invoke) method to use Win32 DLL, you must use the namespace system. runtime. interopservices.

17 rows

[Dllimport ("Win32_sum.dll")]
Private Static Extern IntSum (IntX,IntY );
 

How can I use VISUAL C ++ 6.0 to develop Win32 DLL? (C/C ++), we have placed the developed win32_sum.dll under the C: \ WINDOWS project. Win32 DLL does not need to be compiled like Com DLL, just put it in c: \ windows.

Declare the sum () function here, and use the dllimport attribute to inform C # To find the sum () function in win32_sum.dll. In addition, C # specifies that all functions of the primary ke must be static extern.

20 rows

 
Textbox3.text=Sum (convert. toint32 (textbox1.text), convert. toint32 (textbox2.text). tostring ();
 

Actually, this pinvoke function is used by the worker.

Results

Conclusion
When C # and C/C ++ are InterOP, the most important thing is the two alternative responses, which are as follows:

Unmanage type in wtypes. h	Unmanaged C type	Managed class name	Managed C # type	Description
Handle	Void *	System. inptr	N/	32 bits on 32-bit Windows operation systems, 64 bits on 64-bit Windows operation systems.
Byte	Unsigned char	System. byte	Byte	8 bits
Short	Short	System. int16	Short	16 bits
Word	Unsigned short	System. uint16	Ushort	16 bits
Int	Int	System. int32	Int	32 bits
Uint	Unsigned int	System. uint32	Uint	32 bits
Long	Long	System. int32	Int	32 bits
Bool	Long	System. int32	Int	32 bits
DWORD	Unsigned long	System. int32	Int	32 bits
Ulong	Unsigned long	System. int32	Int	32 bits
Char	Char	System. Char	Char	Decorate with ANSI
Lpstr	Char *	System. string or system. Text. stringbuilder	String	Decorate with ANSI
Lpcstr	Const char *	System. string or system. Text. stringbuilder	String	Decorate with ANSI
Lpwstr	Wchar_t *	System. string or system. Text. stringbuilder	String	Decorate with ANSI
Lpcwstr	Const wchar_t *	System. string or system. Text. stringbuilder	String	Decorate with ANSI
Float	Float	System. Single	Float	32 bits
Duoble	Double	System. Double	Double	64 bits

Download the complete program
Pinvoke_win32_sum.7z

Reference
Msdn plateform invoke Data Types
Msdn built-in types table (C # reference)

See also
(Reporter) How to Use Visual C ++ 6.0 to develop Win32 DLL? (C/C ++)

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