In C# ,How can i use a C++ DLL with a class being defined in head file.
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i have a .h file like below. how can i use it in C#? //--------------------------------------------------------------- // AVEControl.h: interface for the AVEControl class. // ////////////////////////////////////////////////////////////////////// #if !defined(AFX_AVECONTROL_H__4E171B4B_A11B_49F1_B41C_5F4A31B5CF08__INCLUDED_) #define AFX_AVECONTROL_H__4E171B4B_A11B_49F1_B41C_5F4A31B5CF08__INCLUDED_ #if _MSC_VER > 1000 #pragma once #endif // _MSC_VER > 1000 #ifdef DEVICECONTROL_EXPORTS #define DEVICECONTROL_API __declspec(dllexport) #else #define DEVICECONTROL_API __declspec(dllimport) #endif typedef HRESULT (*AVECALLBACK) (PBYTE pbData, LONG lDataLength); #define E_DEVICE_NOT_READY 0xB0004001L class DEVICECONTROL_API AVEControl { public: HRESULT StartRecordWithoutPreview(HWND hWndCap, CString FileName, __int64 pFileLength, UINT pFileMessage, BOOL pShowSetting = TRUE); HRESULT StartRecordWithPreview(HWND hWndCap, RECT rc, CString FileName, __int64 pFileLength, UINT pFileMessage, BOOL pShowSetting = TRUE); HRESULT StartPreview(HWND hWndCap, RECT rc); HRESULT SetVideoClippingWindow(HWND hwnd); HRESULT SetCallback(AVECALLBACK Callback); HRESULT GetVideoStatus(PUCHAR pSta); HRESULT SetVideoPosition(LPRECT lpSRCRect, LPRECT lpDSTRect); void GetCurrentImage(CString BmpFileFullName); BOOL IsGraphRunning(void); HRESULT StopGraph(void); HRESULT ApplySettings(CString IniFileFullName); HRESULT SetVideoProcAmp(long Property, long Value); HRESULT GetVideoProcAmp(long Property, long* Value); HRESULT GetEvent(long* EventCode, LONG_PTR* Param1, LONG_PTR* Param2, long msTimeout); HRESULT SetNotifyWindow(OAHWND hwnd, long lMsg, LONG_PTR lInstanceData); HRESULT InitDeviceControl(void); AVEControl(); virtual ~AVEControl(); }; #endif // !defined(AFX_AVECONTROL_H__4E171B4B_A11B_49F1_B41C_5F4A31B5CF08__INCLUDED_)
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i have a .h file like below. how can i use it in C#? //--------------------------------------------------------------- // AVEControl.h: interface for the AVEControl class. // ////////////////////////////////////////////////////////////////////// #if !defined(AFX_AVECONTROL_H__4E171B4B_A11B_49F1_B41C_5F4A31B5CF08__INCLUDED_) #define AFX_AVECONTROL_H__4E171B4B_A11B_49F1_B41C_5F4A31B5CF08__INCLUDED_ #if _MSC_VER > 1000 #pragma once #endif // _MSC_VER > 1000 #ifdef DEVICECONTROL_EXPORTS #define DEVICECONTROL_API __declspec(dllexport) #else #define DEVICECONTROL_API __declspec(dllimport) #endif typedef HRESULT (*AVECALLBACK) (PBYTE pbData, LONG lDataLength); #define E_DEVICE_NOT_READY 0xB0004001L class DEVICECONTROL_API AVEControl { public: HRESULT StartRecordWithoutPreview(HWND hWndCap, CString FileName, __int64 pFileLength, UINT pFileMessage, BOOL pShowSetting = TRUE); HRESULT StartRecordWithPreview(HWND hWndCap, RECT rc, CString FileName, __int64 pFileLength, UINT pFileMessage, BOOL pShowSetting = TRUE); HRESULT StartPreview(HWND hWndCap, RECT rc); HRESULT SetVideoClippingWindow(HWND hwnd); HRESULT SetCallback(AVECALLBACK Callback); HRESULT GetVideoStatus(PUCHAR pSta); HRESULT SetVideoPosition(LPRECT lpSRCRect, LPRECT lpDSTRect); void GetCurrentImage(CString BmpFileFullName); BOOL IsGraphRunning(void); HRESULT StopGraph(void); HRESULT ApplySettings(CString IniFileFullName); HRESULT SetVideoProcAmp(long Property, long Value); HRESULT GetVideoProcAmp(long Property, long* Value); HRESULT GetEvent(long* EventCode, LONG_PTR* Param1, LONG_PTR* Param2, long msTimeout); HRESULT SetNotifyWindow(OAHWND hwnd, long lMsg, LONG_PTR lInstanceData); HRESULT InitDeviceControl(void); AVEControl(); virtual ~AVEControl(); }; #endif // !defined(AFX_AVECONTROL_H__4E171B4B_A11B_49F1_B41C_5F4A31B5CF08__INCLUDED_)
you can try to create a DLL using the C++ class. After creating the DLL it's easier to use in c# with [DllImport] command. In c# char* becomes string byte* becomes byte[] and if you pass a value using reference like in your class "long* Value", use "ref log Value". Hope it helps Do your best to be the best
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you can try to create a DLL using the C++ class. After creating the DLL it's easier to use in c# with [DllImport] command. In c# char* becomes string byte* becomes byte[] and if you pass a value using reference like in your class "long* Value", use "ref log Value". Hope it helps Do your best to be the best
the Question is not the data type. We can noticed that a class have been defined as below: { class DEVICECONTROL_API AVEControl } in the head file, all the functions is defined in the class. so if i use [DllImport] to define the function in C#, when run it, an exception is found ,which message as "EntryPoint can not be found in DLL", So I think the reason is that we cann't use the class from the unmanaged Dll directly in C#,we have to build a wrapper use C++.net . but How?
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the Question is not the data type. We can noticed that a class have been defined as below: { class DEVICECONTROL_API AVEControl } in the head file, all the functions is defined in the class. so if i use [DllImport] to define the function in C#, when run it, an exception is found ,which message as "EntryPoint can not be found in DLL", So I think the reason is that we cann't use the class from the unmanaged Dll directly in C#,we have to build a wrapper use C++.net . but How?
i created a c++ dll in .net using a code like this: extern "C" { __declspec(dllexport) { //method body } __declspec(dllexport) { //method body } } try it. maybe it will work for you too! Do your best to be the best
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i created a c++ dll in .net using a code like this: extern "C" { __declspec(dllexport) { //method body } __declspec(dllexport) { //method body } } try it. maybe it will work for you too! Do your best to be the best
thank you for your answer. but I cann't do it. because the DLL is already exist. it was from a video capturer SDK. the head file is defined as in the article. and all functions have been defined in a class. if i use [DlImport],compile is right, but when i run, an exception shown with"can not found the entrypoint from .dll". i think the trouble is the class defination. so i want to know how to use the class from the dll.