C / C++ / MFC Discussion Boards

Nuren9-Nov-04 9:05

9-Nov-04 9:05

Hello, everybody

I have a problem with the GetPrinter call. I use the following code to get the printer info:

// The printer Information (PRINTER_INFO_2)
// is pointed to by m_pPrinterInfo
BOOL CAutoApp::GetPrinterInfo()
{
HANDLE hPrinter = GetPrinterHandle( (char*)((LPCTSTR)(m_printer)) );
if ( hPrinter == NULL ) return FALSE;

// Release previous information
if ( m_pPrinterInfo != NULL )
{
free(m_pPrinterInfo);
m_pPrinterInfo = NULL;
}

DWORD cByteNeeded, cByteUsed;

// Get the buffer size needed
if (!GetPrinter(hPrinter, 2, NULL, 0, &cByteNeeded))
{
if (GetLastError() != ERROR_INSUFFICIENT_BUFFER)
{
_stprintf( m_szLog, "Error code: %u\r\n", GetLastError() );
PrintFileLog::WriteLog( m_szLog ); // winerror.h
PrintFileLog::WriteLog( "Failure to get the printer Info buffer size" );
CloseHandle(hPrinter);
return FALSE;
}
}

m_pPrinterInfo = (PRINTER_INFO_2 *)malloc(cByteNeeded);
if ( m_pPrinterInfo == NULL )
{
// Failure to allocate memory
PrintFileLog::WriteLog( "Failure to allocate memory for the printer Info" );
CloseHandle(hPrinter);
return FALSE;
}

// Get the printer information
if (!GetPrinter(hPrinter,
2,
(LPBYTE)m_pPrinterInfo,
cByteNeeded,
&cByteUsed))
{
// Failure to access the printer
PrintFileLog::WriteLog( "Failure to obtain the printer Info" );
CloseHandle(hPrinter);
free(m_pPrinterInfo);
m_pPrinterInfo = NULL;
return FALSE;
}

CloseHandle(hPrinter);
return TRUE;

} // GetPrinterInfo

When I apply the method to my local printer I get the number of jobs submitted to the printer. However, when I try to get the number of print jobs for a network printer I always get it = 0.

I use the testing procedure

void CAutoApp::printerJobs()
{
// begin testing
int cnt = 0;
bool bJobFound = false;

do
{
if ( GetPrinterInfo() )
{
if ( m_pPrinterInfo->cJobs > 0 )
{
bJobFound = true;
break;
}
}

if ( !bJobFound )
{
Sleep( 5 ); cnt++;
}

} while ( !bJobFound && cnt < 10000 ); // 50 secs wait

if ( bJobFound )
MessageBox(NULL, "Print Job Found!", "Test", MB_OK);
else
MessageBox(NULL, "Print Job Not Found...", "Test", MB_OK);

return;

} // printerJobs

to capture the event (m_pPrinterInfo->cJobs > 0).

I don't know why it works differently for both printers. My access rights to both printers are 'Administrator access rigths' (Print, Manage Printers, Manage Documents, Special Permissions).

I'd appreciate any hint.

Thank you.

Nuren

Nuren

execl and VC++

aguest9-Nov-04 8:59

aguest

9-Nov-04 8:59

hello
i have a data base in prolog and i want to transfer it to excell and make some transformation ,i would like to know if there some API or command who can help me in this work?

Re: execl and VC++

David Crow9-Nov-04 10:10

David Crow

9-Nov-04 10:10

My first question would be is this sort of thing even possible (i.e., exporting the Prolog database to something that Excel can understand)? If it can be done manually, chances are there's a way to do it via code.

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

Re: execl and VC++

Anonymous11-Nov-04 9:57

Anonymous

11-Nov-04 9:57

i could transfer the prolog database to text file ,and now i am looking to transfer it to excel file .

Re: execl and VC++

David Crow11-Nov-04 10:21

David Crow

11-Nov-04 10:21

That'll probably work, but you need to make sure that the format of the text file is understandable by Excel. To verify this, export the Prolog database to a text file and try to open the file via Excel. It will ask you about the delimeters used in the file. If you can successfully open the file via Excel, then you can do the same thing with code.

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

Understanding MFC

Howard78909-Nov-04 7:33

Howard7890

9-Nov-04 7:33

I am new to C++ (formally VB developer) and I am trying to use MFC.
I cannot figure out just how to create a simple dialog box and access a newly created text box with "Hello".
Can anyone help me with this or point me to a link that will help.
Thanks,
Confused | :confused:

Re: Understanding MFC

Nemanja Trifunovic9-Nov-04 7:53

Nemanja Trifunovic

9-Nov-04 7:53

If you use VC++ 6.0 start here.[^].

My programming blahblahblah blog. If you ever find anything useful here, please let me know to remove it.

Outlook 2003 Object Model Problem

Mike Beckerleg9-Nov-04 6:33

Mike Beckerleg

9-Nov-04 6:33

Hi
Am am trying to automatically open email by using C++ to drive Outlook 2003. I use #import to get the correct libraries and everything is working fine except I cannot read encrypted emails. I have an _ItemsPtr for the inbox which I can use to iterate through all the items I have received and I can read all the non-encrypted ones but I can't access the encrypted ones. When I query the IDispatch for the item to get an _MailItemPtr it says the interface is not supported.

The same code (using the appropriate libraries) works fine for Outlook 98, 2000, and 2002, just not for 2003.

Any ideas? Is there something extra I need to do for encrypted mails?

Mike

linking static variables

vilmer9-Nov-04 6:07

vilmer

9-Nov-04 6:07

Hi,

I'm trying to use threads in my app and I should use static variables shared between all threads. Linking the app generates a link error: unresolved symbol static etc...

How can I avoid it?

Thanks

Vilmer

Re: linking static variables

valikac9-Nov-04 6:18

valikac

9-Nov-04 6:18

How are you declaring the static global variables?

Kuphryn

Re: linking static variables

vilmer9-Nov-04 6:27

vilmer

9-Nov-04 6:27

I've just declared the veriables as static, but in MyDialog class (where MyDialog is the main dialog class of my app)

Re: linking static variables

Mike Beckerleg9-Nov-04 6:43

Mike Beckerleg

9-Nov-04 6:43

If in the .h file for your class you have

<br />
class MyClass<br />
{<br />
  static int mStatic;<br />
}

Then in the .cpp you will need the following

int MyClass::mStatic = 123;

Mike

Re: linking static variables

valikac9-Nov-04 10:05

valikac

9-Nov-04 10:05

One solution is to declare the global variable in stdafx.h.

Kuphryn

Getting the array of bytes corresponding to an image of an icon

dit6a99-Nov-04 5:44

dit6a9

9-Nov-04 5:44

I'm using the following procedure in order to get the small icon of an
application window:

HICON GetWindowIcon
(
HWND hwnd
)
{
LRESULT lResult;
HICON hIcon;

hIcon = NULL;

lResult = SendMessageTimeout(hwnd, WM_GETICON, ICON_SMALL, 0,
SMTO_ABORTIFHUNG|SMTO_BLOCK, 1000, (DWORD_PTR *)&hIcon);
if (lResult==0) {
hIcon = NULL;
}

if (hIcon == NULL) {
hIcon = (HICON)GetClassLong(hwnd, GCL_HICONSM);
}

if (hIcon == NULL) {
hIcon = LoadIcon(NULL, IDI_APPLICATION);
}

return hIcon;
}

Sometimes, with some application, SendMessageTimeout returns a hIcon which
is different to NULL but the icon returned doesn't seem to be a small one,
although I'm using the ICON_SMALL constant. Is it normal?

I'm also using the following procedure in order to get the array of bytes
corresponding to the icon image:

int GetIconBits
(
HICON hIcon,
int iIconSize,
long* bits,
int* iIconBitsLength
)
{
ICONINFO iconInfo;
HDC dc;
BITMAPINFO bmi;
int iBits;
long maskBits[4096];
int i;
int iMask;

if(!GetIconInfo((HICON)hIcon, &iconInfo))
return -1;

if((dc = GetDC(NULL)) == NULL) {
DeleteObject(iconInfo.hbmColor);
DeleteObject(iconInfo.hbmMask);
return -1;
}

memset(&bmi, 0, sizeof(BITMAPINFO));
bmi.bmiHeader.biSize = sizeof(BITMAPINFOHEADER);
bmi.bmiHeader.biWidth = iIconSize;
bmi.bmiHeader.biHeight = -iIconSize;
bmi.bmiHeader.biPlanes = 1;
bmi.bmiHeader.biBitCount = 32;
bmi.bmiHeader.biCompression = BI_RGB;

iBits = iIconSize * iIconSize * 32 / 8;
GetDIBits(dc, iconInfo.hbmColor, 0, iIconSize, bits, &bmi,
DIB_RGB_COLORS);

GetDIBits(dc, iconInfo.hbmMask, 0, iIconSize, maskBits, &bmi,
DIB_RGB_COLORS);

for(i = 0; i < iBits; i++) {
bits[i] = bits[i] | ((maskBits[i] != 0) ? 0 : 0xff000000);
}

(*iIconBitsLength) = iBits;

ReleaseDC(NULL, dc);

DeleteObject(iconInfo.hbmColor);
DeleteObject(iconInfo.hbmMask);

return 0;
}

There is a problem with 32-bit anti-aliased icons, which are typical in
Windows XP. The images represented by the arrays of bytes returned by this
procedure have a sort of dark area around. I guess this happens because the
procedure doesn't handle correctly the mask information or something like
that, I don't know. To tell the truth the procedure isn't mine, I've copied
it. Does anybody know how I must treat the information return by the
GetDIBits calls in order get a correct array of bytes representing the
image?

Finally, which is the real format of the array of bytes returned by this
procedure? I mean, if I'm working with 32-bit icons, I need 8 bytes in order
to represent each pixel. The image is supposed to be in a RGB format so, how
are distributed the bytes? Is it something like this?

bits[0] bits[1] bits[2] bits[3] -> (0,0) pixel
bits[4] bits[5] bits[6] bits[7] -> (0,1) pixel
...

If this is correct, how are the RGB components mapped? Is it something like
this?:

A R G B
bits[0] bits[1] bits[2] bits[3] -> (0,0) pixel
bits[4] bits[5] bits[6] bits[7] -> (0,1) pixel
...

Thanks for your help.

--

Re: Getting the array of bytes corresponding to an image of an icon

nenfa15-Dec-09 22:21

nenfa

15-Dec-09 22:21

i met the same problem as you, have you resolved it? if so, can you share your fruit with me, thank you very much

How can I debug OCX

sysmatrix9-Nov-04 5:43

sysmatrix

9-Nov-04 5:43

I have a OCX written in ATL. the OCX is used in ASP and Visual Basic. How can I debug the OCX?

Re: How can I debug OCX

Tim Deveaux9-Nov-04 7:48

Tim Deveaux

9-Nov-04 7:48

You just need to hit a break point. Then, if your debugger is configured to give you the option, you can debug by selecting the Retry or Debug option on the exception dialog. (you may find yourself stepping through the VB6 .pdb in VS.NET, but it works ok).

I would write a little helper DLL that exports a fn that has an _asm int 3, but it would probably be easier to import the DebugBreak statement from kernel32.dll and call it from your code.

See the Declare statement in the VB docs for info.

Declare Sub MyBreak Lib "Kernel32" Alias "DebugBreak" ()

Should work, and you can call MyBreak to cause the break exception to fire. Don't forget to use a debug build of the OCX. Once debugging, you may have to F10 your way through some kernel32 code till you get back to the VB caller - not sure.

hth

Re: How can I debug OCX

nguyenvhn9-Nov-04 15:13

nguyenvhn

9-Nov-04 15:13

Just build ocx in debug mode, insert it into VB Form, build VB EXE. In VC Project Settings, point executable for debug session to that exe file. F5 to debug.

Schewchuk

Anonymous9-Nov-04 4:37

Anonymous

9-Nov-04 4:37

Could anyone help me with Schewchuks method for automatic triangualtion? I've downloaded the C version but am having dificulty running it through Microsft Visual C++. Is there a C++ version out there or a guide to using it
TIA

Re: Schewchuk

David Crow9-Nov-04 5:03

David Crow

9-Nov-04 5:03

Anonymous wrote:
I've downloaded the C version but am having dificulty running it through Microsft Visual C++.

Why? What difficulties are you experiencing? Without knowing any details, it's going to be hard to offer any useful advice.

"Opinions are neither right nor wrong. I cannot change your opinion. I can, however, change what influences your opinion." - David Crow

Re: Schewchuk

pb94949-Nov-04 5:10

pb9494

9-Nov-04 5:10

Hello,

What did you try exactly ? I just opened a Visual Studio .Net command prompt and
typed "cl triangle.c". After uncommenting the #define NO_TIMER, it compiled for me.

Peter B.

fast conversion int/float/double arrays

peterchen9-Nov-04 2:54

peterchen

9-Nov-04 2:54

I'm looking for algorithms / implementations for fast conversion between arrays of float, double and int. Array length can be up to 128K.

All I found was "a fast round()" float|double -> int, but also not optimized for arrays.

I did hope the Intel performance Libraries offer something, but I couldn't find anything.

Any takers?

we are here to help each other get through this thing, whatever it is Vonnegut jr.
boost your code || Fold With Us! || sighist | doxygen

Re: fast conversion int/float/double arrays

Andrew Walker9-Nov-04 12:37

Andrew Walker

9-Nov-04 12:37

This site contains a good reference to the issues, but no actual solution for arrays. However it's likely that if inlining is switched on the overhead of the loop should be minimal. http://mega-nerd.com/FPcast/[^]

however you might want to look at a full assembly using SSE/SSE2 instructions to do this in parallel or to prevent the repeated fld instructions. This isn't my area of expertise but perhaps this would be a good starting point: Conversion Operations[^]

If you can keep you head when all about you
Are losing theirs and blaming it on you;
If you can dream - and not make dreams your master;
If you can think - and not make thoughts your aim;
Yours is the Earth and everything that's in it.

Rudyard Kipling

the full path name in device driver

yanping wang9-Nov-04 1:34

yanping wang

9-Nov-04 1:34

IoCreateDevice's third parameter is DeviceName, while IoCreateSymbolicLink's
first parameter is SymbolicLinkName. what is their full path name?

I don't known the difference between "\\Device\\DrvFltIp","\\DosDevices\\DrvFltIp" or "\\??\\DrvFltIp"

Re: the full path name in device driver

Anonymous9-Nov-04 8:09

Anonymous

9-Nov-04 8:09

Not quite a full answer, but here's code I use to work with a FILE_DEVICE_UNKNOWN device that just needs simple start/open/read/close ops.

I use the following code to setup names for my device - "\\Device\\TestDriver4" is used to identify the device for the CreateService calls 'name of service' - (TestDriver4), while "\\DosDevices\\TDRV4" enables opening of the device with CreateFile as "\\.\TDRV4".

// internal device name - season to taste
#define TDRV4_INTERNAL_NAME  L"\\Device\\TestDriver4"

// symbolic link name - seems to be necessary to use 'DosDevices'
// once in place (see call to IoCreateSymbolicLink in TDrv1_CreateDevice0)
// the CreateFile() API will be able to open our device as 
// "\\\\.\\TDRV4" [ i.e. "\\.\TDRV4"]
#define TDRV4_SYMBOLICLINK_NAME  L"\\DosDevices\\TDRV4"

In my drivers TDrv4_CreateDevice0 fn, the internal name is used in IoCreateDevice, and the symbolic name (aka file name) is used in the call to IoCreateSymbolicLink.

    RtlInitUnicodeString( &ustrInternalName, TDRV4_INTERNAL_NAME);   

    // create the device
    result = IoCreateDevice( pDriverObj,                // From DriverEntry.

                sizeof(TDRV4_DEVICE_EXTENSION), // Make us a block of non-paged pool 
                                                // large enough to store our extension data.
                                        
                &ustrInternalName,      // Any device object that can be 
                                        // the target of an I/O request or 
                                        // that a higher-level driver can 
                                        // connect to must have a DeviceName. 
                                        // An unnamed device object is visible 
                                        // only to the driver that created it 
                                        // or to an FSD through a volume parameter block (VPB).
                                        // (ref [NTDDK])

                FILE_DEVICE_UNKNOWN,       // (We'd use FILE_DEVICE_SERIAL for a serial filter, e.g.)
                0,                         // DeviceCharacteristics ignored.
                FALSE,                     // Exclusive - if TRUE, thread IO calls serialized.
                &pDevObj);                 // On return, will hold pointer to the new device object.
 
    if(NT_SUCCESS(result)) {

        // stop chain
        pDevObj->NextDevice = NULL;
        pDevObj->AttachedDevice = NULL;
 
        ///////////////////////////////
        // init the standard device object extension... this is confusing...
        pDevObj->DeviceObjectExtension->DeviceObject = pDevObj;   // point back to owner
        ///////////////////////////////
 
        ///////////////////////////////
        // now _OUR_ extension_ data...
        pDevExt = (PTDRV4_DEVICE_EXTENSION)(pDevObj->DeviceExtension);
        // end init device extension 
        ///////////////////////////////
 
        if(NT_SUCCESS(result)) {
            // create symbolic link name - could be coded above, but technically not part of dev ext init
            RtlInitUnicodeString( &ustrSymbolicLinkName, TDRV4_SYMBOLICLINK_NAME);   
            result = IoCreateSymbolicLink( &ustrSymbolicLinkName, &ustrInternalName);
        }

yada
yada
yada

hth

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