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hughman
Joined: 11 Feb 2007
Posts: 92
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 Posted: Fri Sep 18, 2009 5:39 am Post subject: about PrintDlgEx and other Printer APIs |
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1.
I can Call PrintDlg to display the print dialog via the same method while PrintDlgEx can't. What's wrong about my funciton?
| Code: |
/*
typedef struct tagPDEX {
DWORD lStructSize;
HWND hwndOwner;
HGLOBAL hDevMode;
HGLOBAL hDevNames;
HDC hDC;
DWORD Flags;
DWORD Flags2;
DWORD ExclusionFlags;
DWORD nPageRanges;
DWORD nMaxPageRanges;
LPPRINTPAGERANGE lpPageRanges;
DWORD nMinPage;
DWORD nMaxPage;
DWORD nCopies;
HINSTANCE hInstance;
LPCTSTR lpPrintTemplateName;
LPUNKNOWN lpCallback;
DWORD nPropertyPages;
HPROPSHEETPAGE *lphPropertyPages;
DWORD nStartPage;
DWORD dwResultAction;
} PRINTDLGEX, *LPPRINTDLGEX;
*/
Printer_LoadPrintDlgEx(hParent)
{
VarSetCapacity(structPDX, SizeOf_structPDX := 84, 0)
NumPut(SizeOf_structPDX, structPDX, 0)
NumPut(hParent, structPDX, 4) ; hwndOwner, diffrent from PrintDlg, it can't be null
PD_NOPAGENUMS:=0x8 ; if the PD_NOPAGENUMS flag is not specified, lpPageRanges must be non-NULL.
PD_RETURNDC:=0x100
NumPut(PD_RETURNDC | PD_NOPAGENUMS, structPDX, 20)
DllCall("comdlg32\PrintDlgExA", "UInt", &structPDX)
hDC := NumGet(structPDX, 16)
Return hDC
}
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2.
Another problem is that when I should add "A" or "W" to the called funtion. It seems no need to do so for many other funtions, but GetDefaultPrinter, PrintDlg, PrintDlgEx, etc , can't work without the suffix.
3.
| Code: |
nSize := VarSetCapacity(sPrinterName, 256)
DllCall("winspool.drv\GetDefaultPrinterA", "Str", sPrinterName, "UIntP", nSize)
VarSetCapacity(hPrinter, 4)
DllCall("winspool.drv\OpenPrinterA", "Str", sPrinterName, "Int", hPrinter, "UInt", 0)
MsgBox % hPrinter
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hPrinter retrun null, what's the problem?[/code] |
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SKAN
Joined: 26 Dec 2005
Posts: 7159
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| Posted: Fri Sep 18, 2009 6:16 am Post subject: Re: about PrintDlgEx and other Printer APIs |
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| Quote: | 2.
Another problem is that when I should add "A" or "W" to the called funtion. It seems no need to do so for many other funtions, but GetDefaultPrinter, PrintDlg, PrintDlgEx, etc , can't work without the suffix. |
- "A' stands for Ansi and "W" for Unicode ( Wide Character )
- For DllCall(), the first parameter should be the exact exported function name ( case sensitive ), and if not, AHK would return an errorlevel of -4
| Quote: | | -4: The specified function could not be found inside the DLL. |
Note: I have seen Lexikos mentioning elsewhere that AHK automatically appends an "A" to function names, but I am unsure
To view the exported functions of a DLL, you may use Dependency Walker
| Quote: | 3.
hPrinter retrun null, what's the problem? |
| Code: | nSize := VarSetCapacity( sPrinterName,256 )
DllCall( "winspool.drv\GetDefaultPrinterA", Str,sPrinterName, UIntP,nSize )
DllCall( "winspool.drv\OpenPrinterA", Str,sPrinterName, IntP,hPrinter, UInt,0 )
MsgBox % sPrinterName "`n" hPrinter |
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hughman
Joined: 11 Feb 2007
Posts: 92
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| Posted: Sat Sep 19, 2009 3:54 pm Post subject: |
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| thx ,SKAN, it's a good utility. |
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