[讨论]有关usb数据的读写

　[讨论]有关usb数据的读写

　　请教各位，在vc++中对u盘的数据读写用到了DDK，而在vb中却不需要，请问xp系统的DDK哪里能下载，我在网上没有找到下载的地方。在XP系统作是怎样用VC来进行U盘的数据的读写？

找来的答案:

这是部分代码:主要就是找到USB,打开它,通讯的方法和串口一样!

UINT CommProcOne(LPVOID pParam)

{

COMSTAT ComStat;

DWORD dwErrorFlags;

int ReTemp=0;

CDownLoadWavDlg *pdlg=(CDownLoadWavDlg *)pParam;

while(1)

{

if (::WaitForSingleObject(pdlg->eventkill,0)==WAIT_OBJECT_0)

{

break;

}

//字符数2

ClearCommError(hPipeRead,&dwErrorFlags,&ComStat);

if(ComStat.cbInQue>0)

{

WaitForSingleObject(pdlg->m_hPostMsgEvent,INFINITE);

ResetEvent(pdlg->m_hPostMsgEvent);

ReTemp=pdlg->ThreadReadCom(EV_RXCHAR,0);

ReLenght+=ReTemp;

//1为命令包的长度

if (ReLenght>=2)

{

//::WaitForSingleObject(pdlg->MSGevent,INFINITE);

ReLenght=0;

}

//continue;

}

}

return 0;

}

HANDLE CDownLoadWavDlg::OpenOneDevice(HDEVINFO hDvcInfo, PSP_INTERFACE_DEVICE_DATA DvcInfoData, char *sDevNameBuf)

{

HANDLE hOut = INVALID_HANDLE_VALUE;

ULONG iReqLen = 0;

SetupDiGetInterfaceDeviceDetail(hDvcInfo, DvcInfoData, NULL, 0, &iReqLen, NULL);

ULONG iDevDataLen = iReqLen; //sizeof(SP_FNCLASS_DEVICE_DATA) + 512;

PSP_INTERFACE_DEVICE_DETAIL_DATA pDevData = (PSP_INTERFACE_DEVICE_DETAIL_DATA)malloc(iDevDataLen);

pDevData->cbSize = sizeof(SP_INTERFACE_DEVICE_DETAIL_DATA);

if(SetupDiGetInterfaceDeviceDetail(hDvcInfo, DvcInfoData, pDevData, iDevDataLen, &iReqLen, NULL))

{

strcpy(sDevNameBuf, pDevData->DevicePath);

hOut = CreateFile(pDevData->DevicePath, GENERIC_READ|GENERIC_WRITE, FILE_SHARE_READ|FILE_SHARE_WRITE, NULL, OPEN_EXISTING, 0, NULL);

}

free(pDevData);

return hOut;

}

HANDLE CDownLoadWavDlg::OpenUsbDevice(LPGUID pGuid, char *sDevNameBuf)

{

HANDLE hOut = INVALID_HANDLE_VALUE;

HDEVINFO hDevInfo = SetupDiGetClassDevs(pGuid, NULL, NULL, DIGCF_PRESENT|DIGCF_INTERFACEDEVICE);

SP_INTERFACE_DEVICE_DATA deviceInfoData;

deviceInfoData.cbSize = sizeof (SP_INTERFACE_DEVICE_DATA);

ULONG nGuessCount = MAXLONG;

for(ULONG iDevIndex=0; iDevIndex<nguesscount; idevindex++)

{

if(SetupDiEnumDeviceInterfaces(hDevInfo, 0, pGuid, iDevIndex, &deviceInfoData))

{

if((hOut=OpenOneDevice(hDevInfo, &deviceInfoData, sDevNameBuf)) != INVALID_HANDLE_VALUE)

break;

}

else if(GetLastError() == ERROR_NO_MORE_ITEMS) //No more items

{

break;

}

}

SetupDiDestroyDeviceInfoList(hDevInfo);

return hOut;

}

bool CDownLoadWavDlg::GetUsbDeviceFileName(LPGUID pGuid, char *sDevNameBuf)

{

HANDLE hDev = OpenUsbDevice(pGuid, sDevNameBuf);

if(hDev != INVALID_HANDLE_VALUE)

{

CloseHandle(hDev);

return true;

}

return false;

}

HANDLE CDownLoadWavDlg::OpenMyDevice()

{

char DeviceName[512] = "";

return OpenUsbDevice((LPGUID)&GUID_CLASS_D12_BULK, DeviceName);

}

HANDLE CDownLoadWavDlg::OpenMyDevPipe(const char *PipeName)

{

char DeviceName[512] = "";

if(GetUsbDeviceFileName((LPGUID)&GUID_CLASS_D12_BULK, DeviceName))

{

strcat(DeviceName,"//");

strcat(DeviceName,PipeName);

return CreateFile(DeviceName, GENERIC_WRITE|GENERIC_READ, FILE_SHARE_WRITE|FILE_SHARE_READ, NULL, OPEN_EXISTING, 0, NULL);

}

return INVALID_HANDLE_VALUE;

}

//***************************************************************//

//函数功能:调用读串口API的函数 //

//函数参数:存放串口内容的字符串及要读取的长度 //

//函数返回值:读入的长度 //

//编写人:孙雪松 编写日期:2003年11月21日 //

//***************************************************************//

DWORD CDownLoadWavDlg::ReadComm(char *buf,DWORD dwLength)

{

BOOL fState;

DWORD length=0;

COMSTAT ComStat;

DWORD dwErrorFlags;

ClearCommError(hPipeRead,&dwErrorFlags,&ComStat);

length=min(dwLength,ComStat.cbInQue);

//读串口

fState=ReadFile(hPipeRead,buf,length,&length,NULL);//

return length;

}

//***************************************************************//

//函数功能:调用写串口API的函数. //

//函数参数:将要写的内容及和长度 //

//函数返回值:写入的长度 //

//编写人:孙雪松 编写日期:2003年11月21日 //

//***************************************************************//

DWORD CDownLoadWavDlg::WriteCommand(char *buf,DWORD dwLength)

{

BOOL fState;

DWORD length=0;

length=dwLength;

COMSTAT ComStat;

DWORD dwErrorFlags;

ClearCommError(hPipeWrite,&dwErrorFlags,&ComStat);

PurgeComm(hPipeWrite, PURGE_RXCLEAR | PURGE_TXCLEAR | PURGE_RXABORT | PURGE_TXABORT);

//写串口

fState=WriteFile(hPipeWrite,buf,length,&length,NULL);

return length;

}

//***************************************************************//

//函数功能:读串口中的数据函数(并可做一定的处理) //

//函数参数:参数一,串口事件,参数二,未用 //

//函数返回值:0为正确,-1为错误 //

//编写人:孙雪松 编写日期:2003年11月21日 //

//***************************************************************//

int CDownLoadWavDlg::ThreadReadCom(WPARAM wParam,LPVOID pParam)

{

char buf[64];

int nLength;

if((wParam & EV_RXCHAR)!=EV_RXCHAR)

{

return 0;

}

//读数据

nLength=ReadComm(buf,64);

if(nLength)

{

for(int i=0;i<nlength;i++)

{

bufReturn[i]=buf[i];//+ReLenght

}

}

/*CString aaa,bbb;

for(int j=0;j<nlength;j++)

{

aaa.Format("0X%02x ",bufReturn[j]);

bbb+=aaa;

}

m_list.AddString(bbb);*/

ReadEvent.SetEvent();

return nLength;

}

int CDownLoadWavDlg::CloseUSB()

{

eventkill.SetEvent();

m_pThread=NULL;

SetEvent(m_hPostMsgEvent);

if(m_hPostMsgEvent)

CloseHandle(m_hPostMsgEvent);

if(m_osRead.hEvent)

CloseHandle(m_osRead.hEvent);

if(m_osWrite.hEvent)

CloseHandle(m_osWrite.hEvent);

if(hPipeRead != INVALID_HANDLE_VALUE) //打开 Pipe 成功

{

CloseHandle(hPipeRead);

}

if(hPipeWrite != INVALID_HANDLE_VALUE) //打开 Pipe 成功

{

CloseHandle(hPipeWrite);

}

return 1;

}

void CDownLoadWavDlg::OnButtonOpen()

{

// TODO: Add your control notification handler code here

//驱动程序里面的读Pipe名, 对应访问某个端点的 I/O, 需要与驱动一致

m_Scroller.Cleanup();

m_list.ShowWindow(SW_SHOWNORMAL);

hPipeRead = OpenMyDevPipe("PIPE00");

if(hPipeRead != INVALID_HANDLE_VALUE) //打开读Pipe成功

{

//m_list.AddString("提示:读端点0打开成功.");

m_list.InsertItem("提示:读端点0打开成功.", 0, RGB(0,0,0), RGB(9,239,26));

}

else

{

//m_list.AddString("提示:读端点0未打开成功.");

m_list.InsertItem("提示:读端点0未打开成功.", 0,RGB(0,0,0),RGB(9,239,26));

}

//驱动程序里面的写Pipe名, 对应访问某个端点的 I/O, 需要与驱动一致

hPipeWrite= OpenMyDevPipe("PIPE01");

if(hPipeWrite != INVALID_HANDLE_VALUE) //打开写Pipe成功

{

//m_list.AddString("提示:写端点1打开成功.");

m_list.InsertItem("提示:写端点1打开成功.", 0,RGB(0,0,0), RGB(9,239,26));

}

else

{

//m_list.AddString("提示:读端点1未打开成功.");

m_list.InsertItem("提示:读端点1未打开成功.", 0,RGB(0,0,0),RGB(9,239,26));

}

}

void CDownLoadWavDlg::OnCancel()

{

// TODO: Add extra cleanup here

CloseUSB();

m_Ticker.Cleanup();

m_Scroller.Cleanup();

CDialog::OnCancel();

}