十一月 24, 2011

用VC++实现USB接口读写数据的程序

Written by

使用一个GUIDguidHID_1查找并打开一个USB设备

[code lang=”c”]

extern "C" int PASCAL SearchUSBDevice()
{
HANDLE hUsb;

int nCount, i, j;//标记同一设备个数
HDEVINFO hDevInfoSet;
BOOL bResult;

PSP_DEVICE_INTERFACE_DETAIL_DATA pDetail =NULL;

memset(m_sysversion, 0, 20);
GetSysVersion(m_sysversion);

// 检索相关GUID的USB设备总设备个数
if (!GetUSBList())
{
return 0;
}
// 取得一个该GUID相关的设备信息集句柄
hDevInfoSet = ::SetupDiGetClassDevs((LPGUID)&guidHID_1,//GUID_CLASS_USB_DEVICE, // 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 NULL;
}

// 申请设备接口数据空间

nCount = 0;
bResult = TRUE;
for (i=0; i< 34; i++)
{
bDeviceOpen[i] = FALSE;
memset(m_DeviceDesc[i], 0, 256);
}

SP_DEVICE_INTERFACE_DATA ifdata;
// 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)&guidHID_1,//GUID_CLASS_USB_DEVICE, // GUID
(ULONG)nCount, // 设备信息集里的设备序号
&ifdata); // 设备接口信息

if (bResult)
{
ULONG predictedLength = 0;
ULONG requiredLength = 0;
// 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
NULL, // 设备接口细节(设备路径)
0, // 输出缓冲区大小
&requiredLength, // 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
// 取得该设备接口的细节(设备路径)
predictedLength=requiredLength;

// if(pDetail)
// {
// pDetail =NULL;
// }
pDetail = (PSP_INTERFACE_DEVICE_DETAIL_DATA)::GlobalAlloc(LMEM_ZEROINIT, predictedLength);
pDetail->cbSize = sizeof(SP_DEVICE_INTERFACE_DETAIL_DATA);
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)
predictedLength, // 输出缓冲区大小
&requiredLength, // 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);
if (strcmp(m_sysversion, "winnt")==0)
{
char ch[18];
for(i=0;i<17;i++){
ch[i]=*(pDetail->DevicePath+8+i);
}
ch[17]=’\0’;
if (strcmp(ch,"vid_0471&pid_0666")==0)//比较版本号,防止意外出错
{

memset( &READ_OS, 0, sizeof( OVERLAPPED ) ) ;
memset( &WRITE_OS, 0, sizeof( OVERLAPPED ) ) ;

READ_OS.hEvent = CreateEvent( NULL, // no security
TRUE, // explicit reset req
FALSE, // initial event reset
NULL ) ; // no name
if (READ_OS.hEvent == NULL)
{
break;
}

WRITE_OS.hEvent = CreateEvent( NULL, // no security
TRUE, // explicit reset req
FALSE, // initial event reset
NULL ) ; // no name
if (NULL == WRITE_OS.hEvent)
{
CloseHandle( READ_OS.hEvent );
break;
}

hUsb=CreateFile(pDetail->DevicePath,//&guidHID_1,//
GENERIC_READ|GENERIC_WRITE,
FILE_SHARE_READ|FILE_SHARE_WRITE,
NULL,
OPEN_EXISTING,
FILE_ATTRIBUTE_NORMAL/*|
FILE_FLAG_OVERLAPPED*/,
NULL);
if (hUsb != NULL)
{
// 比较定位找到的USB在哪个USB PORT上
char id[30];
memset(id, 0, 30);
i=0;
do
{
id[i]=*(pDetail->DevicePath+26+i);
i++;
}
while(id[i-1]!=’#’);
id[i-1] = ‘\0’;
for (j=0; j<34; j++)
{
if(strcmp(id, m_USBList[j])==0)
{
sprintf(m_DeviceDesc[j+1], "%s", pDetail->DevicePath);
m_USBPositionMap[nCount] = j+1;
break;
}
}

CloseHandle(hUsb);
nCount++;
// break;
}
}// 比较驱动版本
}// 比较操作系统版本
else
{
memset( &READ_OS, 0, sizeof( OVERLAPPED ) ) ;
memset( &WRITE_OS, 0, sizeof( OVERLAPPED ) ) ;

READ_OS.hEvent = CreateEvent( NULL, // no security
TRUE, // explicit reset req
FALSE, // initial event reset
NULL ) ; // no name
if (READ_OS.hEvent == NULL)
{
break;
}

WRITE_OS.hEvent = CreateEvent( NULL, // no security
TRUE, // explicit reset req
FALSE, // initial event reset
NULL ) ; // no name
if (NULL == WRITE_OS.hEvent)
{
CloseHandle( READ_OS.hEvent );
break;
}

hUsb=CreateFile(pDetail->DevicePath,//&guidHID_1,//
GENERIC_READ|GENERIC_WRITE,
FILE_SHARE_READ|FILE_SHARE_WRITE,
NULL,
OPEN_EXISTING,
FILE_ATTRIBUTE_NORMAL/*|
FILE_FLAG_OVERLAPPED*/,
NULL);
if (hUsb != NULL)
{
if(strcmp(pDetail->DevicePath, m_USBList[j])==0)
{
sprintf(m_DeviceDesc[j+1], "%s", pDetail->DevicePath);
m_USBPositionMap[nCount] = j+1;
break;
}
CloseHandle(hUsb);
nCount++;
// break;
}
}
}
}
}
// 释放设备接口数据空间
::GlobalFree(pDetail);

// 关闭设备信息集句柄
::SetupDiDestroyDeviceInfoList(hDevInfoSet);

iDeviceCount = nCount;

return nCount;
}
// 写
BOOL Writestr(char *buf,int buflen, int index)
{
BOOL fWriteStat;
DWORD dwErrorFlags;
DWORD dwError;
COMSTAT ComStat;
char szError[ 10 ] ;
DWORD ret;
int len, i, j, packet;
div_t div_result;
BYTE sendpacket[65];
BYTE xorcode="0x00";

if (m_gphdCom[index] == NULL) // no usb device(jk100c)
{
return -1;
}

div_result = div(buflen, 58);
if (div_result.rem == 0)
{
packet = div_result.quot;
}
else
{
packet = div_result.quot+1;
}
for (i=0; i<packet; i++)
{
memset(sendpacket, 0, 65);
if(i==packet-1)
{
// end packet
if (div_result.rem == 0)
{
len = 58;
}
else
{
len = div_result.rem;
}
}
else
{
len = 58;
}
sendpacket[0] = 0x13;
sendpacket[1] = 3+len;
sendpacket[2] = 0x01;
sendpacket[3] = packet*16+i+1;
memcpy(sendpacket+4, buf+(i*58), len);
for(j=0;j<len+3;j++)
{
xorcode^=sendpacket[j+1];
}
sendpacket[len+4] = (char)xorcode;
sendpacket[len+5] = 0x23;
PurgeComm(m_gphdCom[index],PURGE_RXCLEAR|PURGE_TXCLEAR);
// Sleep(10);
fWriteStat = WriteFile(m_gphdCom[index], sendpacket, len+6,&ret, NULL);
if (!fWriteStat)
{
if(GetLastError() == ERROR_IO_PENDING)
{
dwError = GetLastError();
// an error occurred, try to recover
wsprintf( szError, "\n\r <CE-%u>", dwError ) ;
OutputDebugString(szError);
ClearCommError(m_gphdCom[index], &dwErrorFlags, &ComStat ) ;
if (dwErrorFlags >0)
{
wsprintf( szError, "\n\r <CE-%u>", dwErrorFlags ) ;
OutputDebugString(szError);
}
}
else
{
// some other error occurred
ClearCommError(m_gphdCom[index], &dwErrorFlags, &ComStat ) ;
if (dwErrorFlags > 0)
{
wsprintf( szError, "\n\r <CE-%u>", dwErrorFlags ) ;
OutputDebugString(szError);
}
return FALSE;
}
}
if (i != packet-1)
{
// should be receive ack
if (ReceivePacketAnswer(index) != 0)
{
return FALSE;
}
}
}

return TRUE;
}

// 读
int Readstr(char *buf,int nMaxLength, int index)
{
BOOL fReadStat ;
COMSTAT ComStat;
DWORD dwErrorFlags;
DWORD dwLength;
DWORD dwError;
char szError[ 10 ];

if (fCOMMOpened==0)
{
return FALSE; //串口未打开
}

// only try to read number of bytes in queue
ClearCommError(m_gphdCom[index], &dwErrorFlags, &ComStat) ;
//dwLength = min( (DWORD) nMaxLength, ComStat.cbInQue ) ;

dwLength=nMaxLength;
if (dwLength > 0)
{
if (olap==TRUE)
{
fReadStat = ReadFile(m_gphdCom[index],buf, dwLength, &dwLength,&READ_OS) ;
if (!fReadStat)
{
if (GetLastError() == ERROR_IO_PENDING)
{
OutputDebugString("\n\rIO Pending");
while(!GetOverlappedResult(m_gphdCom[index], &READ_OS,
&dwLength, TRUE ))
{
dwError = GetLastError();
if(dwError == ERROR_IO_INCOMPLETE) continue;
else
{
// an error occurred, try to recover
ClearCommError(m_gphdCom[index],&dwErrorFlags, &ComStat ) ;
break;
}
}
}
else // end—–if (GetLastError() == ERROR_IO_PENDING)
{
// some other error occurred
dwLength = 0 ;
ClearCommError(m_gphdCom[index], &dwErrorFlags, &ComStat ) ;
if (dwErrorFlags >0)
{
wsprintf( szError, "\n\r <CE-%u>", dwErrorFlags ) ;
OutputDebugString(szError);
}
}
} // end—–if (!fReadStat)
} // end—–if (olap==TRUE)
else
{
fReadStat = ReadFile( m_gphdCom[index],buf, dwLength, &dwLength, NULL ) ;
if (!fReadStat)
{
dwError = GetLastError();
ClearCommError(m_gphdCom[index],&dwErrorFlags, &ComStat ) ;

if (dwErrorFlags >0)
{
wsprintf( szError, "\n\r <CE-%u>", dwErrorFlags ) ;
OutputDebugString(szError);
}
}
PurgeComm(m_gphdCom[index],PURGE_RXCLEAR|PURGE_TXCLEAR);
}
}

return dwLength;
}
[/code]

(本文来自:http://bbs.ednchina.com/BLOG_ARTICLE_14969.HTML)

Category : C/C++VC++

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