how eject a usb device which is not a partable disk

Question

0.00/5 (No votes)

See more:

my program requires the ejection of a usb DEVICE ,I GOOGLE this and found sth useful ,but when I finished the code , I found out it can not eject the device I wanted to , i debug found that the computer found the devnode ,but eject failed . I used CM_Request_Device_Eject API in my code.Here is the code:

HDEVINFO hDevInfo;
		SP_DEVINFO_DATA  DeviceInfoData;
		DWORD i;
		hDevInfo = SetupDiGetClassDevs(&guidHID1,0,0,DIGCF_PRESENT|DIGCF_DEVICEINTERFACE);
		if(hDevInfo ==INVALID_HANDLE_VALUE)
		{
			MessageBox(_T("SetupDiGetClassDevs failed"));
		}
		DeviceInfoData.cbSize = sizeof(SP_DEVINFO_DATA);
		for(i=0;SetupDiEnumDeviceInfo(hDevInfo,i,&DeviceInfoData);i++)
		{
			LPTSTR buffer = NULL;
			PVOID buffer2 = NULL;
			DWORD buffersize = 0;
			CONFIGRET cr;
			ULONG len;
			PNP_VETO_TYPE pnpvietotype;
			CHAR vetoname[MAX_PATH];
			ULONG ulStatus;
			ULONG ulProblemNumber;
			cr = CM_Get_DevNode_Status(&ulStatus,&ulProblemNumber,DeviceInfoData.DevInst,0);
			if(CR_SUCCESS == cr)
			{
				MessageBox(_T("the device node is found!"));
			}
			else
			{
				DWORD err;
				err = GetLastError();
				MessageBox((LPCTSTR(err)));
				MessageBox(_T("the deice node is not found "));
			}
			 if((DN_DISABLEABLE&ulStatus)!=0)
				 MessageBox(LPCWSTR(DN_DISABLEABLE&ulStatus));
			 if((DN_REMOVABLE&ulStatus)!=0)
				 MessageBox(LPCWSTR(DN_REMOVABLE&ulStatus));
			len = MAX_PATH;
			for(int i = 0;i<=3;i++)
			{
			 cr = CM_Request_Device_Eject(DeviceInfoData.DevInst,&pnpvietotype,(LPWSTR)vetoname,len,0);
			 if(CR_SUCCESS == cr)
			 {
				 DWORD err;
				err = GetLastError();
				MessageBox((LPCTSTR(err)));
				MessageBox(_T("Eject device successfully!"));
			  }
			  else
			  {
				DWORD err;
				err = GetLastError();
				MessageBox((LPCTSTR(err)));
				MessageBox(_T("Eject device failed."));
			   }
			
			
		}
		SetupDiDestroyDeviceInfoList(hDevInfo);   
}

please look at the codes and help me ,really appriciate all of you.
and the compile environment is VS2010+WIN7

Posted 13-Jul-11 23:13pm

markfilan

Updated 13-Jul-11 23:36pm

Prerak Patel

v2

Add a Solution

2 solutions

Add a Solution

Add your solution here

Treat my content as plain text, not as HTML

Preview 0

…

Existing Members

Sign in to your account

...or Join us

Download, Vote, Comment, Publish.

Your Email
Password
Forgot your password?

Your Email
This email is in use. Do you need your password?
Optional Password

I have read and agree to the Terms of Service and Privacy Policy
Please subscribe me to the CodeProject newsletters

When answering a question please:

Read the question carefully.
Understand that English isn't everyone's first language so be lenient of bad spelling and grammar.
If a question is poorly phrased then either ask for clarification, ignore it, or edit the question and fix the problem. Insults are not welcome.
Don't tell someone to read the manual. Chances are they have and don't get it. Provide an answer or move on to the next question.

Let's work to help developers, not make them feel stupid.

This content, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

enhzflep · Answer 1 · 2011-07-14T01:28:00

Solution 1

Hi,
Well first of all - what is the value of err after attempting to eject the disk??
Second of all, have you tried to display the text-message of this error code? I see no call to FormatMessage anywhere in your code.

If you haven't, and are not familiar with the method to do so, you may wish to pay particular attention to the use of GetLastError and FormatMessage in this [^]link.

Hope this helps.

Posted 14-Jul-11 1:28am

enhzflep

Comments

markfilan 15-Jul-11 1:53am

i used the way you told me, it's strange the error message it gave back is the operation complete successful.but the return value of cr is not CR_SUCCESS.

Hasan Aytekin · Answer 2 · 2011-08-04T00:12:00

Solution 2

CM_Request_Device_Eject not supported after vista !

Posted 4-Aug-11 0:12am

Hasan Aytekin