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<DIV> Hi all,<BR><BR>I'm beginner in Python and need help. I'm writing software for a robotic <BR>telescope. For CCD camera control we use MaxIm DL (Diffraction Limited). I <BR>have a problem with CCDCamera.SaveImage.<BR></DIV>
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<DIV>Here is the code (Python):<BR><BR>import win32com.client, time<BR>CCDCamera = win32com.client.Dispatch('MaxIm.CCDCamera')<BR>CCDCamera.LinkEnabled = True<BR>if CCDCamera.LinkEnabled == False:<BR> print 'Failed to start camera.'<BR>exp = int(raw_input('Exposition[sec]: '))<BR>CCDCamera.Expose(exp, 1, 0)<BR>while CCDCamera.ImageReady == False:<BR> time.sleep<BR>print 'Done'<BR>time.sleep(3)<BR>CCDCamera.SaveImage('C:/1.fit')<BR></DIV>
<DIV><BR>Error message:<BR>> File "S:MaxImmaxim.py", line 19, in ?<BR>> CCDCamera.SaveImage('C:/1.fit')<BR>> File "C:ProgrammePython24Libsite-<BR>> packageswin32comclientdynamic.py", line 491, in __getattr__<BR>> raise pythoncom.com_error, details<BR>> com_error: (-2147352567, 'Ausnahmefehler aufgetreten.',<BR>> (65535, 'MaxIm DL 4', 'Invalid Input', None, 0, 0), None)<BR><BR><BR>Here is the answer that we recieved from Diffraction Limited:<BR>---------<BR>For CCDCamera.SaveImage, 'Invalid Input' is reported only if the argument is<BR>not of an acceptable type. As you are probably aware from looking at the<BR>type library, the filename argument is declared as a variant. What the type<BR>library doesn't tell you is that the variant must be either a BSTR (unicode<BR>string with header) or a reference to a BSTR. Specifically, the 'vt' member<BR>of the VARIANT must be either VT_BSTR or VT_BSTR|VT_BYREF.<BR><BR>Does python provide any way of influencing how arguments for COM methods are<BR>created? If so, you may be able to get this to work. It may be as simple<BR>as assigning the string to a variable name instead of passing it as a<BR>literal, or perhaps there's something equivalent to a C++ cast operator or a<BR>VB 'type' function (CInt, CStr, etc.).<BR><BR>This problem is likely to affect any MaxIm DL automation method that takes a<BR>string as an argument.<BR>---------<BR><BR><BR><BR>The question is, how to convert a String in a BSTR (unicodestring with <BR>header)?<BR><BR></DIV>
<DIV><BR>For your prompt reply, I say thank you in advance.<BR><BR><BR>Best regards,<BR>Aleksandar Cikota<BR><BR></DIV>
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<DIV><STRONG><FONT color=#004080>-----------------------------------------</FONT></STRONG></DIV>
<DIV><FONT face=Verdana color=#004080 size=2><STRONG>Aleksandar Cikota</STRONG></FONT></DIV>
<DIV><FONT face=Verdana size=2><STRONG><FONT color=#004080>MSN: <A href="mailto:Aleksandar_Cikota@hotmail.com">Aleksandar_Cikota@hotmail.com</A></FONT></STRONG></FONT></DIV>
<DIV><STRONG><FONT face=Verdana color=#004080 size=2>SkyPe: Aleksandar_Cikota</FONT></STRONG></DIV>
<DIV><FONT face=Verdana size=2><STRONG><FONT color=#004080>e-mail: <A href="mailto:alexci@gmx.net">alexci@gmx.net</A></FONT></STRONG></FONT></DIV>
<DIV><STRONG><FONT face=Verdana color=#004080 size=2>Web page:</FONT></STRONG> <A href="http://www.neznamadresu.com/astronomija"><FONT face=Verdana size=2>www.neznamadresu.com/astronomija</FONT></A></DIV></TD></TR>
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