About InstallWinIoDriver function of WinIo.dll

[cedricvictor]

Dear all: I use winIo.dll with my project, when I call InstallWinIoDriver function, it always return false, but my application still work, What happened? There are source code below

bool _stdcall InstallWinIoDriver(PWSTR pszWinIoDriverPath, bool IsDemandLoaded)
{
SC_HANDLE hSCManager;
SC_HANDLE hService;
// Remove any previous instance of the driver
RemoveWinIoDriver();

hSCManager = OpenSCManager(NULL, NULL,     
SC\_MANAGER\_ALL\_ACCESS);

if(hSCManager)
{
 // Install the driver
 hService = CreateService(hSCManager, L"WINIO", L"WINIO",   
 SERVICE\_ALL\_ACCESS, SERVICE\_KERNEL\_DRIVER, (IsDemandLoaded  
 == true) ? SERVICE\_DEMAND\_START : SERVICE\_SYSTEM\_START, 
 SERVICE\_ERROR\_NORMAL, pszWinIoDriverPath, NULL, NULL, NULL, 
 NULL, NULL);

  CloseServiceHandle(hSCManager);
 if(hService == NULL)
    return false;                   //strange 
}
else
    return false;                  //strange
    CloseServiceHandle(hService);  //strange
    return true;                   //strange

}

Thanks for your help, Victor

[Gisle Vanem]

I have no idea really. But it's always useful to have some trace-code that prints the result of GetLastError() and FormatMessage(). Something like: MY_TRACE (("CreateService() failed; %s\n", my_strerror(GetLastError())));

-- Gisle V.

[Lost User]

Hmmm, Could be that the CreateService function[^] is returning either ERROR_DUPLICATE_SERVICE_NAME or maybe ERROR_SERVICE_EXISTS. As previously stated GetLastError[^] is your friend.

cedricvictor wrote:

but my application still work,

Keep in mind that if you do not have source code for winIo.dll ... it could also be installing the service. Best Wishes, -David Delaune

[cedricvictor]

Dear Randor: You are right. In other function, the service is exist. So the function always return false. Thank for your help, Victor