::CreateDC() returns NULL with errorcode ERROR_INVALID_PRINTER_NAME(1801)
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Hi guys, I have a "display driver" program which I install it successfully on all kinds of OS. Then I call "::CreateDC()" to create a corresponding device context in another program, it works fine in most OS except in win2K. I mean, "::CreateDC()" succeeds in "XP, Vista, Win7", but fails in "Win2K"(returns NULL and GetLastError() is ERROR_INVALID_PRINTER_NAME(1801)). I googled it and did find some threads, but all are vague. However, I figure it's kinda "win2k OS" issue. I think function implementation of "CreateDC" in "win2k" has imperfection. Does anyone happen to encounter this same problem? Any workaround with it? Any replys are appreciated :-D
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Hi guys, I have a "display driver" program which I install it successfully on all kinds of OS. Then I call "::CreateDC()" to create a corresponding device context in another program, it works fine in most OS except in win2K. I mean, "::CreateDC()" succeeds in "XP, Vista, Win7", but fails in "Win2K"(returns NULL and GetLastError() is ERROR_INVALID_PRINTER_NAME(1801)). I googled it and did find some threads, but all are vague. However, I figure it's kinda "win2k OS" issue. I think function implementation of "CreateDC" in "win2k" has imperfection. Does anyone happen to encounter this same problem? Any workaround with it? Any replys are appreciated :-D
You could try to use the DC returned by
PrintDlgEx(..)... :)virtual void BeHappy() = 0; -
You could try to use the DC returned by
PrintDlgEx(..)... :)virtual void BeHappy() = 0;Thanks for your reply :) But I think you misunderstood it. It has nothing to do with "Print" or "Printer". It's about "video display driver" :-D
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Thanks for your reply :) But I think you misunderstood it. It has nothing to do with "Print" or "Printer". It's about "video display driver" :-D
Yes, I have probably misunderstood it... :) ...does your call look like
::CreateDC("DISPLAY", NULL, ...);under W2K ? :)virtual void BeHappy() = 0; -
Yes, I have probably misunderstood it... :) ...does your call look like
::CreateDC("DISPLAY", NULL, ...);under W2K ? :)virtual void BeHappy() = 0;;) The follow is my code fragment: HDC CreateDCFromDriver() { HDC hDC; char lpszDriver[0x20]; if ( FALSE == GetDriverDeviceName(lpszDriver) ) return NULL; hDC = ::CreateDCA(lpszDriver, 0, 0, 0); if ( hDC == NULL ) { MM_TRACE(_T("CreateDCFromDriver: ErrorCode - %08X"), GetLastError()); } return hDC; } I think my code is just OK, cause everything works fine in "xp, vista, win7" OS. It only occur in "win2k", when in "win2k" OS the code will go into "MM_TRACE(_T("CreateDCFromDriver: ErrorCode - %08X"), GetLastError()); ". Meanwhile in other OS, it go into "return hDC;" correctly.
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;) The follow is my code fragment: HDC CreateDCFromDriver() { HDC hDC; char lpszDriver[0x20]; if ( FALSE == GetDriverDeviceName(lpszDriver) ) return NULL; hDC = ::CreateDCA(lpszDriver, 0, 0, 0); if ( hDC == NULL ) { MM_TRACE(_T("CreateDCFromDriver: ErrorCode - %08X"), GetLastError()); } return hDC; } I think my code is just OK, cause everything works fine in "xp, vista, win7" OS. It only occur in "win2k", when in "win2k" OS the code will go into "MM_TRACE(_T("CreateDCFromDriver: ErrorCode - %08X"), GetLastError()); ". Meanwhile in other OS, it go into "return hDC;" correctly.
You could try to trace the
lpszDrivertoo... :)virtual void BeHappy() = 0; -
You could try to trace the
lpszDrivertoo... :)virtual void BeHappy() = 0;:) Yes, I've tried that, and it's like "\\.\DISPLAY3" which is OK. I still believe that this problem is caused by the implementation of function "CreateDC" under "win2k" OS. ;P I just want to know if there's a workaround out there about this issue. :((
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:) Yes, I've tried that, and it's like "\\.\DISPLAY3" which is OK. I still believe that this problem is caused by the implementation of function "CreateDC" under "win2k" OS. ;P I just want to know if there's a workaround out there about this issue. :((
Would it be enough under win2k ? :) :
MSDN:
If there are multiple monitors on the system, calling CreateDC(TEXT("DISPLAY"),NULL,NULL,NULL) will create a DC covering all the monitors.
virtual void BeHappy() = 0; -
Would it be enough under win2k ? :) :
MSDN:
If there are multiple monitors on the system, calling CreateDC(TEXT("DISPLAY"),NULL,NULL,NULL) will create a DC covering all the monitors.
virtual void BeHappy() = 0;I do believe that it's relevant to multiple monitors, but I just can't ask our users to set up another monitor or another video card, or something like that. I can only make some improvement in our program which I still don't know how to do it. ;P
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Would it be enough under win2k ? :) :
MSDN:
If there are multiple monitors on the system, calling CreateDC(TEXT("DISPLAY"),NULL,NULL,NULL) will create a DC covering all the monitors.
virtual void BeHappy() = 0;Anyway, I really appreciate your help. ;P
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I do believe that it's relevant to multiple monitors, but I just can't ask our users to set up another monitor or another video card, or something like that. I can only make some improvement in our program which I still don't know how to do it. ;P
Probably the function can not understand the driver name under Win2k and try to find a printer with the name pointer NULL... :)
virtual void BeHappy() = 0;modified on Tuesday, March 30, 2010 4:58 AM
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Probably the function can not understand the driver name under Win2k and try to find a printer with the name pointer NULL... :)
virtual void BeHappy() = 0;modified on Tuesday, March 30, 2010 4:58 AM
Yes, I agree with your point. I found something on the internet which says it may be: * concerning issues about "video card", like "dualhead cards that use a single chipset" * or some "security risk" after win2k OS But for me, neither seems to be correct :(