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function LoadPsychHID
% LoadPsychHID - Try to get PsychHID linked and loaded on MS-Windows, no
% matter what.
if ~IsWin
% Nothing to do on non-Windows:
if IsLinux && isempty(getenv('DISPLAY'))
error('Sorry, PsychHID() is not yet supported on Linux without a running X-Server.');
end
return;
end
% Windows on Octave or with Matlab R2007a or later. Give it a try:
try
PsychHID('Version');
catch %#ok<CTCH>
% PsychHID loading and linking failed:
if IsWin
% PsychHID failed on Windows. Most likely cause would be "invalid
% MEX file error" due to PsychHID failing to link against
% required DLL's. libusb-1.0 may not be properly installed?
fprintf('INFO: Initial invocation of the PsychHID mex file failed.\n');
fprintf('INFO: Most likely a required DLL is not installed in your system, e.g., libusb-1.0.dll\n');
fprintf('INFO: I will now check if this is the culprit and work around it. To avoid future warnings,\n');
if IsWin(1)
% 64-Bit installation:
fprintf('INFO: please copy the 64-Bit libusb-1.0.dll from the PsychContributed\\x64 folder into your C:\\WINDOWS\\system32\\ \n');
else
% 32-Bit installation:
fprintf('INFO: please copy the 32-Bit libusb-1.0.dll from the PsychContributed folder into your C:\\WINDOWS\\system32\\ \n');
fprintf('INFO: folder or - on a 64-Bit Windows setup into the C:\\WINDOWS\\SysWOW64\\ - \n');
end
fprintf('INFO: folder or a similarly appropriate place. You can get a fresher copy of libusb-1.0.dll from \n');
fprintf('INFO: http://libusb.org/wiki/windows_backend if you want to stay up to date.\n');
fprintf('INFO: Retrying now, may fail...\n');
% The old drill: cd into our PsychContributed folder which
% contains required DLL's. Retry by self-invocation. If this was
% the culprit, then the linker should load, link and init
% PsychHID and we should succeed. Otherwise we fail again.
wd = pwd;
try
if IsWin(1)
% 64-Bit version of libusb.dll
cd([PsychtoolboxRoot 'PsychContributed' filesep 'x64' filesep]);
else
% 32-Bit version of libusb.dll
cd([PsychtoolboxRoot 'PsychContributed' filesep ]);
end
PsychHID('Version');
cd(wd);
return;
catch %#ok<CTCH>
cd(wd);
psychrethrow(psychlasterror);
end
end
% Game over.
psychrethrow(psychlasterror);
end
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