Monitoring WinSpool (HELP)

[Marcelo Barra]

Hello guys, sorry for my english.

I'm trying to write an application in JNA which monitoring the winspool using the Print Spooler API Functions.

I need to know when a job is sent to the spool, need job information (name, user which printed, printer name, machine name, number of pages printed, date, etc.)

For this I am using the FindFirstPrinterChangeNotification and FindNextPrinterChangeNotification functions. I happen to not knowing mapping and obtain the information through the object 

PRINTER_NOTIFY_INFO which contains an array of PRINTER_NOTIFY_INFO_DATA, where I believe I get this information.

Does anyone know how can I map and get information?

I'm using:

- Intel Core2 Duo CPU;

- windows 7 (64-bit);

Links to the functions (Print Spooler API Functions):

- FindFirstPrinterChangeNotification (http://msdn.microsoft.com/en-us/library/windows/desktop/dd162722(v=vs.85).aspx)

- FindNextPrinterChangeNotification (http://msdn.microsoft.com/en-us/library/windows/desktop/dd162723(v=vs.85).aspx)

Mapping:

------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

public interface WinSpool2 extends Winspool {

WinSpool2 INSTANCE = (WinSpool2) Native.loadLibrary("Winspool.drv", WinSpool2.class, W32APIOptions.UNICODE_OPTIONS);

...

HANDLE FindFirstPrinterChangeNotification(HANDLE hPrinter, int fdwFilter, int fdwOptions, Pointer pPrinterNotifyOptions);

boolean FindNextPrinterChangeNotification(HANDLE hChange, IntByReference pdwChange, Pointer pPrinterNotifyOptions, Pointer ppPrinterNotifyInfo);

public static class PRINTER_NOTIFY_OPTIONS extends Structure {

public static class ByReference extends PRINTER_NOTIFY_OPTIONS implements Structure.ByReference { }

public int Version;

public int Flags;

public int Count;

public PRINTER_NOTIFY_OPTIONS_TYPE.ByReference pTypes;

public PRINTER_NOTIFY_OPTIONS() {

}

public PRINTER_NOTIFY_OPTIONS(int size) {

super(new Memory(size));

}

public PRINTER_NOTIFY_OPTIONS(int Version, int Flags, int Count, PRINTER_NOTIFY_OPTIONS_TYPE.ByReference pTypes) {

this.Version = Version;

this.Flags = Flags;

this.Count = Count;

this.pTypes = pTypes;

}

@SuppressWarnings("rawtypes")

@Override

protected List getFieldOrder() {

return Arrays.asList(new String[] {"Version", "Flags", "Count", "pTypes"});

}

}

public static class PRINTER_NOTIFY_OPTIONS_TYPE extends Structure {

public static class ByReference extends PRINTER_NOTIFY_OPTIONS_TYPE implements Structure.ByReference { }

public short Type;

public short Reserved0;

public int Reserved1;

public int Reserved2;

public int Count;

public Pointer pFields;

public PRINTER_NOTIFY_OPTIONS_TYPE() {

}

public PRINTER_NOTIFY_OPTIONS_TYPE(int size) {

super(new Memory(size));

}

@SuppressWarnings("rawtypes")

@Override

protected List getFieldOrder() {

return Arrays.asList(new String[] {"Type","Reserved0","Reserved1","Reserved2","Count","pFields"});

}

}

public static class PRINTER_NOTIFY_INFO extends Structure {

public int Version;

public int Flags;

public int Count;

public PRINTER_NOTIFY_INFO_DATA[] aData = new PRINTER_NOTIFY_INFO_DATA[1];

public PRINTER_NOTIFY_INFO() {

super();

}

public PRINTER_NOTIFY_INFO(int Version, int Flags, int Count, PRINTER_NOTIFY_INFO_DATA aData[]) {

super();

this.Version = Version;

this.Flags = Flags;

this.Count = Count;

if ((aData.length != this.aData.length)) 

throw new IllegalArgumentException("Wrong array size !");

this.aData = aData;

}

public static class ByReference extends PRINTER_NOTIFY_INFO implements Structure.ByReference {}

public static class ByValue extends PRINTER_NOTIFY_INFO implements Structure.ByValue {}

@SuppressWarnings("rawtypes")

protected List getFieldOrder() {

return Arrays.asList("Version", "Flags", "Count", "aData");

}

}

public static class PRINTER_NOTIFY_INFO_DATA extends Structure {

public short Type;

public short Field;

public int Reserved;

public int Id;

public NotifyData_union NotifyData;

public static class NotifyData_union extends Union {

public int[] adwData = new int[2];

public Data_struct Data;

public static class Data_struct extends Structure {

public int cbBuf;

public PVOID pBuf;

public Data_struct() {

super();

}

public Data_struct(int cbBuf, PVOID pBuf) {

super();

this.cbBuf = cbBuf;

this.pBuf = pBuf;

}

protected List<? > getFieldOrder() {

return Arrays.asList("cbBuf", "pBuf");

}

public static class ByReference extends Data_struct implements Structure.ByReference {}

public static class ByValue extends Data_struct implements Structure.ByValue {}

}

public NotifyData_union() {

super();

}

public NotifyData_union(Data_struct Data) {

super();

this.Data = Data;

setType(Data_struct.class);

}

public NotifyData_union(int adwData[]) {

super();

if ((adwData.length != this.adwData.length)) 

throw new IllegalArgumentException("Wrong array size !");

this.adwData = adwData;

setType(int[].class);

}

public static class ByReference extends NotifyData_union implements Structure.ByReference {}

public static class ByValue extends NotifyData_union implements Structure.ByValue {}

}

public PRINTER_NOTIFY_INFO_DATA() {

super();

}

public PRINTER_NOTIFY_INFO_DATA(short Type, short Field, int Reserved, int Id, NotifyData_union NotifyData) {

super();

this.Type = Type;

this.Field = Field;

this.Reserved = Reserved;

this.Id = Id;

this.NotifyData = NotifyData;

}

public static class ByReference extends PRINTER_NOTIFY_INFO_DATA implements Structure.ByReference {}

public static class ByValue extends PRINTER_NOTIFY_INFO_DATA implements Structure.ByValue {}

@SuppressWarnings("rawtypes")

protected List getFieldOrder() {

return Arrays.asList("Type", "Field", "Reserved", "Id", "NotifyData");

}

}

int PRINTER_CHANGE_ADD_FORM = 0x00010000;

int PRINTER_CHANGE_SET_FORM = 0x00020000;

int PRINTER_CHANGE_DELETE_FORM = 0x00040000;

int PRINTER_CHANGE_FORM = 0x00070000;

int PRINTER_CHANGE_ADD_JOB = 0x00000100;

int PRINTER_CHANGE_SET_JOB = 0x00000200;

int PRINTER_CHANGE_DELETE_JOB = 0x00000400;

int PRINTER_CHANGE_WRITE_JOB = 0x00000800;

int PRINTER_CHANGE_JOB = 0x0000FF00;

int PRINTER_CHANGE_ADD_PORT = 0x00100000;

int PRINTER_CHANGE_CONFIGURE_PORT = 0x00200000;

int PRINTER_CHANGE_DELETE_PORT = 0x00400000;

int PRINTER_CHANGE_PORT = 0x00700000;

int PRINTER_CHANGE_ADD_PRINT_PROCESSOR = 0x01000000;

int PRINTER_CHANGE_DELETE_PRINT_PROCESSOR = 0x04000000;

int PRINTER_CHANGE_PRINT_PROCESSOR = 0x07000000;

int PRINTER_CHANGE_ADD_PRINTER = 0x00000001;

int PRINTER_CHANGE_SET_PRINTER = 0x00000002;

int PRINTER_CHANGE_DELETE_PRINTER = 0x00000004;

int PRINTER_CHANGE_FAILED_CONNECTION_PRINTER = 0x00000008;

int PRINTER_CHANGE_PRINTER = 0x000000FF;

int PRINTER_CHANGE_ADD_PRINTER_DRIVER = 0x10000000;

int PRINTER_CHANGE_SET_PRINTER_DRIVER = 0x20000000;

int PRINTER_CHANGE_DELETE_PRINTER_DRIVER = 0x40000000;

int PRINTER_CHANGE_PRINTER_DRIVER = 0x70000000;

int PRINTER_CHANGE_ALL = 0x7777FFFF;

}

public static void main(String[] args) {

...

PRINTER_NOTIFY_OPTIONS options = new PRINTER_NOTIFY_OPTIONS();

options.Flags = 1; //PRINTER_NOTIFY_OPTIONS_REFRESH

options.Version = 2;

HANDLE handle = WinSpool2.INSTANCE.FindFirstPrinterChangeNotification(handleByRef.getValue(), WinSpool2.PRINTER_CHANGE_ADD_JOB, 0, options.getPointer());

if(handle == null)

throw new Win32Exception(Kernel32.INSTANCE.GetLastError());

// Wait until you send a job to the print queue

if (Kernel32.INSTANCE.WaitForSingleObject(handle, WinBase.INFINITE) == WinBase.WAIT_OBJECT_0) {

// Job sent to print queue

IntByReference pdwChange = new IntByReference();

PRINTER_NOTIFY_INFO ppPrinterNotifyInfo = new PRINTER_NOTIFY_INFO();

if (WinSpool2.INSTANCE.FindNextPrinterChangeNotification(handle, pdwChange, options.getPointer(), ppPrinterNotifyInfo.getPointer())) {

PRINTER_NOTIFY_INFO_DATA jobData = ppPrinterNotifyInfo.aData[0];

System.out.println(jobData.Field); // NullPointerException

}

}

}

[Daniel Doubrovkine]

The FindNextPrinterChangeNotification takes a pointer to a pointer that receives a system-allocated buffer. I think `options` needs to be passed in "as is", not as .getPointer, JNA will take care of marshalling that correctly, and the notify info should be a ByReference pointer type to the structure you expect back. Again, in neither case you should need to explicitly call getPointer.

If you add this to JNA proper with a test (even failing), and still can't figure it out, I'd be inclined to debug it :)

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[Marcelo Barra]

Thanks for your response Daniel, i´ll try this!

[Marcelo Barra]

Hello Daniel, I changed my code to the following (in red), but still I am unable to get the results.

any help would be welcome:

-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

public interface WinSpool2 extends Winspool {

WinSpool2 INSTANCE = (WinSpool2) Native.loadLibrary("Winspool.drv", WinSpool2.class, W32APIOptions.UNICODE_OPTIONS);

...

HANDLE FindFirstPrinterChangeNotification(HANDLE hPrinter, int fdwFilter, int fdwOptions, PRINTER_NOTIFY_OPTIONS pPrinterNotifyOptions);

boolean FindNextPrinterChangeNotification(HANDLE hChange, IntByReference pdwChange, PRINTER_NOTIFY_OPTIONS pPrinterNotifyOptions, PRINTER_NOTIFY_INFO ppPrinterNotifyInfo);

HANDLE handle = WinSpool2.INSTANCE.FindFirstPrinterChangeNotification(handleByRef.getValue(), WinSpool2.PRINTER_CHANGE_ADD_JOB, 0, options);

if(handle == null)

throw new Win32Exception(Kernel32.INSTANCE.GetLastError());

// Wait until you send a job to the print queue

if (Kernel32.INSTANCE.WaitForSingleObject(handle, WinBase.INFINITE) == WinBase.WAIT_OBJECT_0) {

// Job sent to print queue

IntByReference pdwChange = new IntByReference();

PRINTER_NOTIFY_INFO ppPrinterNotifyInfo = new PRINTER_NOTIFY_INFO();

if (WinSpool2.INSTANCE.FindNextPrinterChangeNotification(handle, pdwChange, options, ppPrinterNotifyInfo)) {

PRINTER_NOTIFY_INFO_DATA jobData = ppPrinterNotifyInfo.aData[0];

System.out.println(jobData.Field); // stopped giving NullPointerException, but the ADATA field of PRINTER_NOTIFY_INFO object does not return the expected results, comes empty

}

}

}

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Atenciosamente,

Marcelo Barra

[Daniel Doubrovkine]

Can you post a project with this that I can just run or, better, add to JNA tests? I can check it out.

[wolf....@gmx.net]

I`ve added a sample project which shows exactly what you are looking for. Please take a look into "/jnalib/contrib/w32printing/src" for further details.

[Marcelo Barra]

Thank you, I had already solved this problem and my solution was very similar to yours. 

Thanks again

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Atenciosamente,

Marcelo Barra

[simone bello']

Hello,

I've stumbled on the same issue Marcello had, and I was trying to get the code you posted (/jnalib/contrib/w32printing/src). 

Can you please give me an hint how to get that code? It would be really helpful!!

thanks,

Simone

[Timothy Wall]

https://github.com/twall/jna/tree/master/contrib/w32printing/src

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