readasync.cpp

USB开发例子可以在其他语言中用API调用,有一个POwerbuilder例子

HANDLE (*OpenHIDDevice)(unsigned short wVID, unsigned short wPID,BOOL bSync);

HANDLE hDevice=OpenHIDDevice(0x1241, 0xe001, FALSE);
if(hDevice)
{
    char szBuf[9];
    szBuf[0]=0;

    OVERLAPPED  overlap;
    memset(&overlap, 0, sizeof(OVERLAPPED));   
    
    BOOL b=ReadFile (hDevice,szBuf,9,&dw,&overlap);
    if(!b) 
    {
        if(ERROR_IO_PENDING == GetLastError())
            m_ctlData.AddString("No Data");
        else AfxMessageBox("Read error!");
    }else m_ctlData.AddString("Read OK!");
	CloseHIDDevice(hDevice);
}