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test-script4.ahk
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Error in #include file ...\Tests\SGDIPrint\Lib\SGDIPrint.ahk":
This DllCall requires a prior VarSetCapacity. The program is now unstable and will exit.

Line#
115: WinGet,MainhWnd,ID,ahk_pid %mainPID%
116: DetectHiddenWindows,%T_DetectHiddenWindows%
117: NULL := ""
119: VarSetCapacity(pPrinter , A_PtrSize, 0)
120: out := DllCall("Winspool.drv\OpenPrinter", "Ptr", &pPrinterName, "PtrP", pPrinter, "UInt", NULL, "Ptr")
122: sizeDevMode := DllCall("Winspool.drv\DocumentProperties", "Ptr", MainhWnd, "Ptr", pPrinter, "StrP", pPrinterName, "Ptr", &pDevModeOutput, "Ptr", &pDevModeInput, "UInt", 0)
124: VarSetCapacity(pDevModeOutput , sizeDevMode, 0)
---> 125: out2 := DllCall("Winspool.drv\DocumentProperties", "Ptr", MainhWnd, "Ptr", pPrinter, "StrP", pPrinterName, "Ptr", &pDevModeOutput, "Ptr", &pDevModeInput, "UInt", 2)
127: if ((dmOrientation = 1)||(dmOrientation = 2))
128: NumPut(dmOrientation, pDevModeOutput, 44, "Short")
129: if dmCopies is integer
130: {
131: if (dmCopies > 0)
132: NumPut(dmCopies, pDevModeOutput, 54, "Short")
133: }

The current thread will exit.
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OK
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BOOL EnumPrinters(
__in DWORD Flags,
__in LPTSTR Name,
__in DWORD Level,
__out LPBYTE pPrinterEnum,
__in DWORD cbBuf,
__out LPDWORD pcbNeeded,
__out LPDWORD pcReturned
);

pcbNeeded [out]

A pointer to a value that receives the number of bytes copied if the function succeeds or the number of bytes required if cbBuf is too small.
pcReturned [out]

A pointer to a value that receives the number of PRINTER_INFO_1, PRINTER_INFO_2 , PRINTER_INFO_4, or PRINTER_INFO_5 structures that the function returns in the array to which pPrinterEnum points.

So, the types for the last two parameters of EnumPrinters should be ptrp.

124: VarSetCapacity(pDevModeOutput , sizeDevMode, 0)
---> 125: out2 := DllCall("Winspool.drv\DocumentProperties", "Ptr", MainhWnd, "Ptr", pPrinter, "StrP", pPrinterName, "Ptr", &pDevModeOutput, "Ptr", &pDevModeInput, "UInt", 2)

Damned,
i have no idea what could cause that.
Help!
Can anybody explain or fix this issue?

If the function fails, the return value is less than zero.