VC USB读写

Question

小弟想请教一下怎么用VC操纵usb设备读写

Answer 1

ＣＦｉｌｅ类是很强大的，CreateFile｜ReadFile｜WriteFile等能创建很多种文件并读写，文件是一个大的概念，包括很多扩展名的类型，你可以放心大胆的用

Answer 2

http://blog.ednchina.com/asyun/14969/message.aspx

Answer 3

写的数据的格式得依赖于USB另一端设备的驱动程序  

Answer 4

关键是查找设备，读写设备就用句柄用readfile，writefile就行
查找设备：
m_infor=_T("");
// TODO: Add your control notification handler code here
GUID guidHID;
HidD_GetHidGuid(&guidHID);
CString strShow;
strShow.Format("%08x-%04x-%04x-%02x-%02x-%02x-%02x-%02x-%02x-%02x-%02x\r\n",
guidHID.Data1,guidHID.Data2,guidHID.Data3,guidHID.Data4[0],
guidHID.Data4[1],guidHID.Data4[2],guidHID.Data4[3],guidHID.Data4[4],
guidHID.Data4[5],guidHID.Data4[6],guidHID.Data4[7]);
m_infor+= _T("1.HID类的GUID标识为:\r\n  ")+strShow+_T("\r\n");
m_infor+=_T("2.获得全部HID信息……\r\n  ");



HDEVINFO hDevInfo;
hDevInfo=SetupDiGetClassDevs(&guidHID,NULL,NULL,DIGCF_PRESENT | DIGCF_DEVICEINTERFACE);
if (hDevInfo == INVALID_HANDLE_VALUE) // 查询全部HID信息失败 
{
m_infor+=_T("查询失败 - SetupDiGetClassDevs()");
return ;
}
m_infor=m_infor+_T("获得成功！\r\n")+_T("\r\n")+_T("3.获得特定HID识别信息……\r\n  "); SP_INTERFACE_DEVICE_DATA ifdata;
ifdata.cbSize = sizeof(ifdata);
DWORD devindex;
for (devindex = 0;SetupDiEnumDeviceInterfaces(hDevInfo, NULL, &guidHID,devindex, &ifdata); ++devindex)
    {
CString num;
num.Format(_T("第(%d)个设备：\r\n   "),devindex+1);
m_infor+=num;
DWORD needed;
SetupDiGetDeviceInterfaceDetail(hDevInfo, &ifdata, NULL, 0,&needed, NULL);

PSP_INTERFACE_DEVICE_DETAIL_DATA detail = (PSP_INTERFACE_DEVICE_DETAIL_DATA) malloc(needed);
detail->cbSize = sizeof(SP_INTERFACE_DEVICE_DETAIL_DATA);
SP_DEVINFO_DATA did = {sizeof(SP_DEVINFO_DATA)};
SetupDiGetDeviceInterfaceDetail(hDevInfo, &ifdata, detail,needed, NULL, &did);
CString devPath(detail->DevicePath);
m_infor+=_T("设备路径：")+devPath+_T("\r\n ");
///////////////////////////////////////////////////////
TCHAR fname[256];
if (!SetupDiGetDeviceRegistryProperty(hDevInfo, &did,SPDRP_FRIENDLYNAME, NULL, (PBYTE) fname, sizeof(fname), NULL)
&& !SetupDiGetDeviceRegistryProperty(hDevInfo, &did, SPDRP_DEVICEDESC,NULL, (PBYTE) fname, sizeof(fname), NULL))
_tcsncpy(fname, detail->DevicePath, 256);

fname[255] = 0;

m_infor+=_T("  设备类型：");
m_infor+=fname;
m_infor+=_T("\r\n  ");
//CDeviceListEntry e(detail->DevicePath, fname);
free((PVOID) detail);
////////////////////////////////////////////////////////


HANDLE hand1 = CreateFile(devPath, GENERIC_READ|GENERIC_WRITE,FILE_SHARE_READ | FILE_SHARE_WRITE, NULL, OPEN_EXISTING, NULL, NULL);
if (hand1 == INVALID_HANDLE_VALUE)
{
m_infor+=_T(" CreateFile() - 打开失败！\r\n ");
continue;
}
else 
{
m_infor+=_T(" CreateFile() - 打开成功！\r\n ");


}
HIDD_ATTRIBUTES attr = {sizeof(HIDD_ATTRIBUTES)};
BOOLEAN okay = HidD_GetAttributes(hand1, &attr);

if (okay)
{
CString tem;
tem.Format("ProductID:%x ,VendorID:%X ,VersionNumber: %x",attr.ProductID,attr.VendorID,attr.VersionNumber);
m_infor+=_T("        ")+tem+_T("\r\n ");
if (attr.ProductID==0x100 && attr.VendorID==0x930A)
{
hand=hand1;
m_receive.EnableWindow();
      m_send.EnableWindow();
     m_close.EnableWindow();
} }
///////////////////////////////////////////////////////获得设备能力
m_infor+=_T("  获得设备能力……\r\n  ");
PHIDP_PREPARSED_DATA   PreparsedData;

if(HidD_GetPreparsedData(hand1,&PreparsedData))
{
m_infor+=_T("  HidD_GetPreparsedData() - 调用成功！ \r\n ");
}
   
        Cap=new HIDP_CAPS; 
HidP_GetCaps(PreparsedData,Cap);
m_infor+=_T("   HidP_GetCaps() - 调用成功！ \r\n");
CString tmp;
tmp.Format("\
       Usage:%d \r\n\
       UsagePage:%d \r\n\
       InputReportByteLength:%d \r\n\
       OutputReportByteLength:%d \r\n\
       FeatureReportByteLength:%d \r\n\
       NumberLinkCollectionNodes:%d \r\n\
       NumberInputButtonCaps:%d \r\n\
       NumberInputValueCaps:%d \r\n\
       NumberInputDataIndices:%d \r\n\
       NumberOutputButtonCaps:%d \r\n\
       NumberOutputValueCaps:%d \r\n\
       NumberOutputDataIndices:%d \r\n\
       NumberFeatureButtonCaps:%d \r\n\
       NumberFeatureValueCaps:%d \r\n\
       NumberFeatureDataIndices:%d \r\n",
Cap->Usage,
Cap->UsagePage,
Cap->InputReportByteLength,
Cap->OutputReportByteLength,
Cap->FeatureReportByteLength,
Cap->NumberLinkCollectionNodes,
Cap->NumberInputButtonCaps,
Cap->NumberInputValueCaps,
Cap->NumberInputDataIndices,
Cap->NumberOutputButtonCaps,
Cap->NumberOutputValueCaps, 
Cap->NumberOutputDataIndices,  
Cap->NumberFeatureButtonCaps,
Cap->NumberFeatureValueCaps,
Cap->NumberFeatureDataIndices);
m_infor+=tmp;
    
/////////////////////////////////////////////////////////


    }

SetupDiDestroyDeviceInfoList(hDevInfo);
UpdateData(FALSE);

Answer 5

这是上个星期刚做的usb编程实验