Adam R. Frielink wrote:
> I have hit a road block using the Win32-API module. I've gotten a
> working tool which allows me to modify the contents of the Crystal
> Reports RPT file in memory using the API interface. Unfortunately,
> everytime I attempt to access a particular method, my application fails
> with a very non-specific message of...
>
> "Perl Command Line interpreter has encountered a problem and needs to
> close. We are sorry for the inconvenience".
>
> The particular section of code in which the error occurs is:
>
> ___CODE___
> my $PEGetSelectedPrinter = new Win32::API 'crpe32',
> 'PEGetSelectedPrinter', 'IlPlPlPP', 'I';
> if (not defined $PEGetSelectedPrinter) {
> die "Can't import API PEGetSelectedPrinter$!\n";
> }
>
> print DEBUG "Call Get Selected Printer API\n" if $debug;
>
> my $PEGetSelectedPrinterErr =
> $PEGetSelectedPrinter->Call($job,$PEdriverHandle,$PEdriverHandleLength,$
> PEprinterHandle,$PEprinterHandleLength,$PEportHandle,$PEportHandleLength
> ,$DEVMODE); # Errors here
> ___END___
My best first stab at it:
# all but the first arg are pointers and the first arg is a short
my $PEGetSelectedPrinter = new Win32::API 'crpe32', 'PEGetSelectedPrinter',
'sPPPPPPP', 'I' or die "import PEGetSelectedPrinter: $! ($^E)";
my $printJob = 0; # not sure whether these are in, out or in/out args
my $driverHandle = pack 'L', 0; # or what the values should be when you call
my $driverLength = pack 'S', 0; # change the 0s where appropriate
my $printerHandle = pack 'L', 0;
my $printerLength = pack 'S', 0;
my $portHandle = pack 'L', 0;
my $portLength = pack 'S', 0;
# typedef struct _devicemodeA { # DEVMODEA structure
# BYTE dmDeviceName[CCHDEVICENAME]; # 00 - 31
# WORD dmSpecVersion; # 32 - 33
# WORD dmDriverVersion; # 34 - 35
# WORD dmSize; # 36 - 37
# WORD dmDriverExtra; # 38 - 39
# DWORD dmFields; # 40 - 43
# short dmOrientation; # 44 - 45
# short dmPaperSize; # 46 - 47
# short dmPaperLength; # 48 - 49
# short dmPaperWidth; # 50 - 51
# short dmScale; # 52 - 53
# short dmCopies; # 54 - 55
# short dmDefaultSource; # 56 - 57
# short dmPrintQuality; # 58 - 59
# short dmColor; # 60 - 61
# short dmDuplex; # 62 - 63
# short dmYResolution; # 64 - 65
# short dmTTOption; # 66 - 67
# short dmCollate; # 68 - 69
# BYTE dmFormName[CCHFORMNAME]; # 70 - 101
# WORD dmLogPixels; # 102 - 103
# DWORD dmBitsPerPel; # 104 - 107
# DWORD dmPelsWidth; # 108 - 111
# DWORD dmPelsHeight; # 112 - 115
# DWORD dmDisplayFlags; # 116 - 119
# DWORD dmDisplayFrequency; # 120 - 123
# #if (WINVER >= 0x0400) # assuming > 0x0400
# DWORD dmICMMethod; # 124 - 127
# DWORD dmICMIntent; # 128 - 131
# DWORD dmMediaType; # 132 - 135
# DWORD dmDitherType; # 136 - 139
# DWORD dmReserved1; # 140 - 143
# DWORD dmReserved2; # 144 - 147
# } DEVMODEA, *PDEVMODEA, *NPDEVMODEA, *LPDEVMODEA; # 148 bytes
my $mode = pack 'C148', 0 x 180; # I padded 32 just in case
# Alternately, you could do a proper pack here field by field, but if you don't
# need any content set, you can just treat it like a big array of nulls as I
# did. If you need to get something returned back out, you either have to
# unpack it all or use substr to get to the field you want and unpack it
# appropriately. I'm assuming all of the above are 'out' type args.
my $ret = $PEGetSelectedPrinter->Call($printJob, $driverHandle, $driverLength,
$printerHandle, $printerLength, $portHandle, $portLength, $mode);
if ($ret < 1) {
# I assume a true/positive condition would be good
die "PEGetSelectedPrinter: $! ($^E)";
}
You'll need to unpack whatever values are returned that you need.
> I have tried many variations of the Parameters for the Win32::API object
> creation. WINGDI.h says a HANDLE should be a long variable type this is
> not working. I am current under the belief that this abort is caused by
> accessing memory outside my applications work space. But I am not
> certain.
>
> Anyone out there had any success with Crystal Reports to do this trivial
> function? Anyone see my mistakes? I have included a definition of the
> method with call list below.
Your definition doesn't state which are in, out or both type args nor
what the possible return values are.
> C Syntax
> BOOL CRPE_API PEGetSelectedPrinter (
> short printJob,
> HANDLE FAR *driverHandle,
> short FAR *driverLength,
> HANDLE FAR *printerHandle,
> short FAR *printerLength,
> HANDLE FAR *portHandle,
> short FAR *portLength,
> #if defined (WIN32)
> DEVMODEA FAR * FAR *mode
> #else
> DEVMODE FAR * FAR *mode
> #endif );
>
>
> printJob Specifies the print job that you want to query to get
> information on the nondefault
> printer that has been selected with the report.
>
> driverHandle Specifies a pointer to the handle of the printer driver for
> the printer that is
> selected with the print job.
>
> driverLength Specifies a pointer to the length of the printer driver
> name.
>
> printerHandle Specifies a pointer to the handle of the printer that is
> selected with the print job.
>
> printerLength Specifies a pointer to the length of the printer name.
>
> portHandle Specifies a pointer to the handle of the port to which the
> selected printer is
> connected.
>
> portLength Specifies a pointer to the length of the port name.
>
> mode Specifies a pointer to the "DEVMODE" on page 533, or DEVMODE
> Windows
> API structure.
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