private void Button1_Click(object sender, EventArgs e)
{
if (is_USB_device_connected)
{
HID_write_buffer[0] = 0x00; /* must equal to 0x00. */
HID_write_buffer[1] = 0x55;
HID_write_buffer[2] = 0xAA;
UserHIDAPI.HID_Write(target_hid_device, HID_write_buffer, HID_write_buffer.Length);
}
else
{
MessageBox.Show("USB device is not connected!");
}
}
private void USB_Background_Receive()
{
int ret = 0;
bool is_thread_close_needed = false;
retry:
if (0 != UserHIDAPI.HID_Init())
{
ret = -1;
goto exit_0;
}
IntPtr target_hid_device_info = UserHIDAPI.HID_Enumerate(VIDtest, PIDtest);
if (IntPtr.Zero == target_hid_device_info)
{
ret = -2;
goto exit_1;
}
target_hid_device = UserHIDAPI.HID_Open(VIDtest, PIDtest, IntPtr.Zero);
if (IntPtr.Zero == target_hid_device)
{
ret = -3;
goto exit_2;
}
is_USB_device_connected = true;
while (true)
{
int read_hid_data_amount = UserHIDAPI.HID_Read_Timeout(target_hid_device, HID_read_buffer, HID_read_buffer.Length, USB_COMMUNICATION_TIMEOUT_IN_MILLISECONDS);
if (0 > read_hid_data_amount)
{
if (!thread_main.IsAlive)
{
is_thread_close_needed = true;
goto exit_3;
}
ret = -5;
goto exit_3;
}
else if (0 == read_hid_data_amount)
{
if (!thread_main.IsAlive)
{
is_thread_close_needed = true;
goto exit_3;
}
continue;
}
string read_hid_data = String.Empty;
for (int i = 0; i < HID_read_buffer.Length; i++)
{
read_hid_data += HID_read_buffer[i].ToString("X2") + " ";
if (15 == (i % 16))
{
read_hid_data += "\n";
}
}
try
{
RichTextBox_Show(read_hid_data);
}
catch
{
is_thread_close_needed = true;
goto exit_3;
}
}
exit_3:
UserHIDAPI.HID_Close(target_hid_device);
exit_2:
UserHIDAPI.HID_Free_Enumeration(target_hid_device_info);
exit_1:
if (0 != UserHIDAPI.HID_Exit())
{
ret = -4;
}
exit_0:
string stringresult = "ret = " + ret + ": ";
switch (ret)
{
case -1:
stringresult += "fail HID_Init()";
break;
case -2:
stringresult += "fail HID_Enumerate()";
break;
case -3:
stringresult += "fail HID_Open()";
break;
case -4:
stringresult += "fail HID_Exit()";
break;
case -5:
stringresult += "fail HID_Read_Timeout()";
break;
default:
stringresult += "fail unknown";
break;
}
stringresult += "\n";
is_USB_device_connected = false;
if (is_thread_close_needed)
{
return;
}
try
{
RichTextBox_Show(stringresult);
}
catch
{
return;
}
goto retry;
}
