vcdll.cpp

单片机USB串口通信模块的动态链接库

// vcdll.cpp : Defines the initialization routines for the DLL.
//

#include "stdafx.h"
#include "vcdll.h"
extern "C" int APIENTRY  WriteUsb(char SendBuff[],int count);// 
extern "C" BSTR  APIENTRY  ReadUsb(int count);
//extern static int GetDevicePath(LPGUID lpGuid, LPTSTR* pszDevicePath);

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

//
//	Note!
//
//		If this DLL is dynamically linked against the MFC
//		DLLs, any functions exported from this DLL which
//		call into MFC must have the AFX_MANAGE_STATE macro
//		added at the very beginning of the function.
//
//		For example:
//
//		extern "C" BOOL PASCAL EXPORT ExportedFunction()
//		{
//			AFX_MANAGE_STATE(AfxGetStaticModuleState());
//			// normal function body here
//		}
//
//		It is very important that this macro appear in each
//		function, prior to any calls into MFC.  This means that
//		it must appear as the first statement within the 
//		function, even before any object variable declarations
//		as their constructors may generate calls into the MFC
//		DLL.
//
//		Please see MFC Technical Notes 33 and 58 for additional
//		details.
//

/////////////////////////////////////////////////////////////////////////////
// CVcdllApp

BEGIN_MESSAGE_MAP(CVcdllApp, CWinApp)
	//{{AFX_MSG_MAP(CVcdllApp)
		// NOTE - the ClassWizard will add and remove mapping macros here.
		//    DO NOT EDIT what you see in these blocks of generated code!
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CVcdllApp construction

CVcdllApp::CVcdllApp()
{
	// TODO: add construction code here,
	// Place all significant initialization in InitInstance
}

/////////////////////////////////////////////////////////////////////////////
// The one and only CVcdllApp object

CVcdllApp theApp;
		static int GetDevicePath(LPGUID lpGuid, LPTSTR* pszDevicePath)
		{

			HDEVINFO hDevInfoSet;
			SP_DEVICE_INTERFACE_DATA ifdata;
			PSP_DEVICE_INTERFACE_DETAIL_DATA pDetail;
			int nCount;
			BOOL bResult;
			HANDLE uu;
			uu=INVALID_HANDLE_VALUE;
			// 取得一个该GUID相关的设备信息集句柄
			hDevInfoSet = ::SetupDiGetClassDevs(lpGuid,     // class GUID 
				NULL,                    // 无关键字 
				NULL,                    // 不指定父窗口句柄 
				DIGCF_PRESENT | DIGCF_DEVICEINTERFACE);    // 目前存在的设备
		  
			// 失败...
			if (hDevInfoSet == INVALID_HANDLE_VALUE)
			{
				return 0;
			}
		  
			// 申请设备接口数据空间
			pDetail = (PSP_DEVICE_INTERFACE_DETAIL_DATA)::GlobalAlloc(LMEM_ZEROINIT, INTERFACE_DETAIL_SIZE);
		  
			pDetail->cbSize = sizeof(SP_DEVICE_INTERFACE_DETAIL_DATA);
		  
			nCount = 0;
			bResult = TRUE;
		  
			// 设备序号=0,1,2... 逐一测试设备接口，到失败为止
			while (bResult)
			{
				ifdata.cbSize = sizeof(ifdata);
		  
				// 枚举符合该GUID的设备接口
				bResult = ::SetupDiEnumDeviceInterfaces(
					hDevInfoSet,     // 设备信息集句柄
					NULL,            // 不需额外的设备描述
					lpGuid,          // GUID
					(ULONG)nCount,   // 设备信息集里的设备序号
					&ifdata);        // 设备接口信息
		  
				if (bResult)
				{
					// 取得该设备接口的细节(设备路径)
					bResult = SetupDiGetInterfaceDeviceDetail(
						hDevInfoSet,    // 设备信息集句柄
						&ifdata,        // 设备接口信息
						pDetail,        // 设备接口细节(设备路径)
						INTERFACE_DETAIL_SIZE,    // 输出缓冲区大小
						NULL,           // 不需计算输出缓冲区大小(直接用设定值)
						NULL);          // 不需额外的设备描述
		  
					if (bResult)
					{
						// 复制设备路径到输出缓冲区
						::strcpy(pszDevicePath[nCount], pDetail->DevicePath);
						
						// 调整计数值
						nCount++;
					}
		        
				}

			}
		  
			// 释放设备接口数据空间
			::GlobalFree(pDetail);
			//::setupdigetdevicein
			// 关闭设备信息集句柄
			bResult=::SetupDiDestroyDeviceInfoList(hDevInfoSet);
			return nCount;
		}

	//extern "C" int APIENTRY sum2(int i)

	extern "C" int APIENTRY  WriteUsb(char SendBuff[],int count)
		{
			
			const GUID DiskClassGuid1= {0x77f49320,  0x16ef, 0x11d2,{0xad, 0x51, 0x00, 0x60, 0x97, 0xb5, 0x14, 0xdd}};
		//	char SendBuff[16];
	//		IO_BLOCK ioBlock;
			BOOL bResult;                 // results flag
			ULONG nBytes;
			int i;
			const MAX_DEVICE=2;
			char* szDevicePath[MAX_DEVICE];        // 设备路径
			int nDevice;
			HANDLE hDevice;
			

			// 分配需要的空间
			for (i = 0; i < MAX_DEVICE; i++)
			{
				szDevicePath[i] = new char[256];
			}
		  
			// 取设备路径
			nDevice = GetDevicePath((LPGUID)&DiskClassGuid1, szDevicePath);


			strcat (szDevicePath[0],"\\");
			strcat (szDevicePath[0],"PIPE01");

			hDevice = CreateFile (szDevicePath[0],
						GENERIC_READ | GENERIC_WRITE,
						FILE_SHARE_READ | FILE_SHARE_WRITE,
						NULL, // no SECURITY_ATTRIBUTES structure
						OPEN_EXISTING, // No special create flags
						0, // No special attributes
		  
						NULL); // No template file

			if (hDevice == INVALID_HANDLE_VALUE)
			{
				return 0;
			}
			//SendBuff[3]=val;
				bResult = WriteFile(hDevice,
					SendBuff,
					count,
					&nBytes,
					NULL);	
		  
			CloseHandle(hDevice);
			return (int)SendBuff[3];
		}

			//int  ReadUsb(int count)
	extern "C" BSTR  APIENTRY  ReadUsb(int count)
		{
			
			char *str="1234567890123456"; 
			LPSTR  readstr;	
			const GUID DiskClassGuid1= {0x77f49320,  0x16ef, 0x11d2,{0xad, 0x51, 0x00, 0x60, 0x97, 0xb5, 0x14, 0xdd}};
			char SendBuff[16];
	//		IO_BLOCK ioBlock;
			BOOL bResult;                 // results flag
			ULONG nBytes;
			int i;
			const MAX_DEVICE=2;
			char* szDevicePath[MAX_DEVICE];        // 设备路径
			int nDevice;
			HANDLE hDevice;
			readstr="000";


			// 分配需要的空间
			for (i = 0; i < MAX_DEVICE; i++)
			{
				szDevicePath[i] = new char[256];
			}
		  
			// 取设备路径
			nDevice = GetDevicePath((LPGUID)&DiskClassGuid1, szDevicePath);


			strcat (szDevicePath[0],"\\");
			strcat (szDevicePath[0],"PIPE00");

			hDevice = CreateFile (szDevicePath[0],
						GENERIC_READ | GENERIC_WRITE,
						FILE_SHARE_READ | FILE_SHARE_WRITE,
						NULL, // no SECURITY_ATTRIBUTES structure
						OPEN_EXISTING, // No special create flags
						0, // No special attributes
		  
						NULL); // No template file

			if (hDevice == INVALID_HANDLE_VALUE)
			{
				return SysAllocString((BSTR)str); 
			}

				bResult = ReadFile(hDevice,
					SendBuff,
					count,
					&nBytes,
					NULL);	

			CloseHandle(hDevice);
			readstr="1234";
			str=(char*)SendBuff;
			return SysAllocString((BSTR)str);
		}