QCUPSSupport-Qt封装Linux打印机相关类


QCUPSSupport类


最近在看linux下cups相关,本能的去搜索下看看Qt有没有封装好的类,大家都知道在linux下所有的都是文件。当然驱动程序也是如此。linux下驱动程序都是一些ppd文件,一般装好的打印机驱动都在这两个位置/usr/share/cups/model/ 和 /etc/cups/ppd。QCUPSSupport是用Qt封装好的调用linux下驱动程序的类。可以直接使用


q_cups_p.h


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#ifndef QCUPS_P_H
#define QCUPS_P_H


//#include "QtCore/qstring.h"
//#include "QtCore/qstringlist.h"
//#include "QtGui/qprinter.h"
#include <QString>
#include <QStringList>
#include <QtPrintSupport/qprinter.h>

#ifndef QT_NO_CUPS
//#include <QtCore/qlibrary.h>
#include <cups/cups.h>
#include <cups/ppd.h>
#include <QLibrary>

QT_BEGIN_NAMESPACE

Q_DECLARE_TYPEINFO(cups_option_t, Q_MOVABLE_TYPE | Q_PRIMITIVE_TYPE);

class QCUPSSupport
{
public:
QCUPSSupport();
~QCUPSSupport();

static bool isAvailable();
static int cupsVersion() { return isAvailable() ? CUPS_VERSION_MAJOR*10000+CUPS_VERSION_MINOR*100+CUPS_VERSION_PATCH : 0; }
int availablePrintersCount() const;
const cups_dest_t* availablePrinters() const;
int currentPrinterIndex() const;
const ppd_file_t* setCurrentPrinter(int index);

const ppd_file_t* currentPPD() const;
const ppd_option_t* ppdOption(const char *key) const;

const cups_option_t* printerOption(const QString &key) const;
const ppd_option_t* pageSizes() const;

int markOption(const char* name, const char* value);
void saveOptions(QList<const ppd_option_t*> options, QList<const char*> markedOptions);

QRect paperRect(const char *choice) const;
QRect pageRect(const char *choice) const;

QStringList options() const;

static bool printerHasPPD(const char *printerName);

QString unicodeString(const char *s);

QPair<int, QString> tempFd();
int printFile(const char * printerName, const char * filename, const char * title,
int num_options, cups_option_t * options);

// add by zhangpf
public:
const char* getCurrentPrinterName(int index) const;
int getCurrentPrinter(const char* name);


private:
void collectMarkedOptions(QStringList& list, const ppd_group_t* group = 0) const;
void collectMarkedOptionsHelper(QStringList& list, const ppd_group_t* group) const;

int prnCount;
cups_dest_t *printers;
const ppd_option_t* page_sizes;
int currPrinterIndex;
ppd_file_t *currPPD;
#ifndef QT_NO_TEXTCODEC
QTextCodec *codec;
#endif
};

QT_END_NAMESPACE

#endif // QT_NO_CUPS

#endif

q_cups.cpp


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#include <qdebug.h>
#include "qcups_p.h"

#ifndef QT_NO_CUPS

#ifndef QT_LINUXBASE // LSB merges everything into cups.h
# include <cups/language.h>
#endif
#include <qtextcodec.h>

QT_BEGIN_NAMESPACE

typedef int (*CupsGetDests)(cups_dest_t **dests);
typedef void (*CupsFreeDests)(int num_dests, cups_dest_t *dests);
typedef const char* (*CupsGetPPD)(const char *printer);
typedef int (*CupsMarkOptions)(ppd_file_t *ppd, int num_options, cups_option_t *options);
typedef ppd_file_t* (*PPDOpenFile)(const char *filename);
typedef void (*PPDMarkDefaults)(ppd_file_t *ppd);
typedef int (*PPDMarkOption)(ppd_file_t *ppd, const char *keyword, const char *option);
typedef void (*PPDClose)(ppd_file_t *ppd);
typedef int (*PPDMarkOption)(ppd_file_t *ppd, const char *keyword, const char *option);
typedef void (*CupsFreeOptions)(int num_options, cups_option_t *options);
typedef void (*CupsSetDests)(int num_dests, cups_dest_t *dests);
typedef cups_lang_t* (*CupsLangGet)(const char *language);
typedef const char* (*CupsLangEncoding)(cups_lang_t *language);
typedef int (*CupsAddOption)(const char *name, const char *value, int num_options, cups_option_t **options);
typedef int (*CupsTempFd)(char *name, int len);
typedef int (*CupsPrintFile)(const char * name, const char * filename, const char * title, int num_options, cups_option_t * options);

static bool cupsLoaded = false;
static int qt_cups_num_printers = 0;
static CupsGetDests _cupsGetDests = 0;
static CupsFreeDests _cupsFreeDests = 0;
static CupsGetPPD _cupsGetPPD = 0;
static PPDOpenFile _ppdOpenFile = 0;
static PPDMarkDefaults _ppdMarkDefaults = 0;
static PPDClose _ppdClose = 0;
static CupsMarkOptions _cupsMarkOptions = 0;
static PPDMarkOption _ppdMarkOption = 0;
static CupsFreeOptions _cupsFreeOptions = 0;
static CupsSetDests _cupsSetDests = 0;
static CupsLangGet _cupsLangGet = 0;
static CupsLangEncoding _cupsLangEncoding = 0;
static CupsAddOption _cupsAddOption = 0;
static CupsTempFd _cupsTempFd = 0;
static CupsPrintFile _cupsPrintFile = 0;

static void resolveCups()
{
QLibrary cupsLib(QLatin1String("cups"), 2);
if(cupsLib.load()) {
_cupsGetDests = (CupsGetDests) cupsLib.resolve("cupsGetDests");
_cupsFreeDests = (CupsFreeDests) cupsLib.resolve("cupsFreeDests");
_cupsGetPPD = (CupsGetPPD) cupsLib.resolve("cupsGetPPD");
_cupsLangGet = (CupsLangGet) cupsLib.resolve("cupsLangGet");
_cupsLangEncoding = (CupsLangEncoding) cupsLib.resolve("cupsLangEncoding");
_ppdOpenFile = (PPDOpenFile) cupsLib.resolve("ppdOpenFile");
_ppdMarkDefaults = (PPDMarkDefaults) cupsLib.resolve("ppdMarkDefaults");
_ppdClose = (PPDClose) cupsLib.resolve("ppdClose");
_cupsMarkOptions = (CupsMarkOptions) cupsLib.resolve("cupsMarkOptions");
_ppdMarkOption = (PPDMarkOption) cupsLib.resolve("ppdMarkOption");
_cupsFreeOptions = (CupsFreeOptions) cupsLib.resolve("cupsFreeOptions");
_cupsSetDests = (CupsSetDests) cupsLib.resolve("cupsSetDests");
_cupsAddOption = (CupsAddOption) cupsLib.resolve("cupsAddOption");
_cupsTempFd = (CupsTempFd) cupsLib.resolve("cupsTempFd");
_cupsPrintFile = (CupsPrintFile) cupsLib.resolve("cupsPrintFile");

if (_cupsGetDests && _cupsFreeDests) {
cups_dest_t *printers;
int num_printers = _cupsGetDests(&printers);
if (num_printers)
_cupsFreeDests(num_printers, printers);
qt_cups_num_printers = num_printers;
}
}
cupsLoaded = true;
}

// ================ CUPS Support class ========================

QCUPSSupport::QCUPSSupport():
prnCount(0),
printers(0),
page_sizes(0),
currPrinterIndex(0),
currPPD(0)
{
if (!cupsLoaded)
resolveCups();

// getting all available printers
if (!isAvailable())
return;

// Update the available printer count
qt_cups_num_printers = prnCount = _cupsGetDests(&printers);

for (int i = 0; i < prnCount; ++i)
{
if (printers[i].is_default) {
currPrinterIndex = i;
setCurrentPrinter(i);
break;
}
}

#ifndef QT_NO_TEXTCODEC
cups_lang_t *cupsLang = _cupsLangGet(0);
codec = QTextCodec::codecForName(_cupsLangEncoding(cupsLang));
if (!codec)
codec = QTextCodec::codecForLocale();
#endif
}

QCUPSSupport::~QCUPSSupport()
{
if (currPPD)
_ppdClose(currPPD);
if (prnCount)
_cupsFreeDests(prnCount, printers);
}

int QCUPSSupport::availablePrintersCount() const
{
return prnCount;
}

const cups_dest_t* QCUPSSupport::availablePrinters() const
{
return printers;
}

const ppd_file_t* QCUPSSupport::currentPPD() const
{
return currPPD;
}

const char* QCUPSSupport::getCurrentPrinterName(int index) const
{
Q_ASSERT(index >= 0 && index <= prnCount);
return printers[index].name;
}

int QCUPSSupport::getCurrentPrinter(const char* name)
{
for (int i = 0; i < prnCount; i++)
{
if (name == printers[i].name)
return i;
}

return -1;
}

const ppd_file_t* QCUPSSupport::setCurrentPrinter(int index)
{
Q_ASSERT(index >= 0 && index <= prnCount);
if (index == prnCount)
return 0;

currPrinterIndex = index;

if (currPPD)
_ppdClose(currPPD);
currPPD = 0;
page_sizes = 0;

const char *ppdFile = _cupsGetPPD(printers[index].name);

if (!ppdFile)
return 0;

currPPD = _ppdOpenFile(ppdFile);
unlink(ppdFile);

// marking default options
_ppdMarkDefaults(currPPD);

// marking options explicitly set
_cupsMarkOptions(currPPD, printers[currPrinterIndex].num_options, printers[currPrinterIndex].options);

// getting pointer to page sizes
page_sizes = ppdOption("PageSize");

return currPPD;
}

int QCUPSSupport::currentPrinterIndex() const
{
return currPrinterIndex;
}

bool QCUPSSupport::isAvailable()
{
if(!cupsLoaded)
resolveCups();

return _cupsGetDests &&
_cupsFreeDests &&
_cupsGetPPD &&
_ppdOpenFile &&
_ppdMarkDefaults &&
_ppdClose &&
_cupsMarkOptions &&
_ppdMarkOption &&
_cupsFreeOptions &&
_cupsSetDests &&
_cupsLangGet &&
_cupsLangEncoding &&
_cupsAddOption &&
(qt_cups_num_printers > 0);
}

const ppd_option_t* QCUPSSupport::ppdOption(const char *key) const
{
if (currPPD) {
for (int gr = 0; gr < currPPD->num_groups; ++gr) {
for (int opt = 0; opt < currPPD->groups[gr].num_options; ++opt) {
if (qstrcmp(currPPD->groups[gr].options[opt].keyword, key) == 0)
return &currPPD->groups[gr].options[opt];
}
}
}
return 0;
}

const cups_option_t* QCUPSSupport::printerOption(const QString &key) const
{
for (int i = 0; i < printers[currPrinterIndex].num_options; ++i) {
if (QLatin1String(printers[currPrinterIndex].options[i].name) == key)
return &printers[currPrinterIndex].options[i];
}
return 0;
}

const ppd_option_t* QCUPSSupport::pageSizes() const
{
return page_sizes;
}

int QCUPSSupport::markOption(const char* name, const char* value)
{
return _ppdMarkOption(currPPD, name, value);
}

void QCUPSSupport::saveOptions(QList<const ppd_option_t*> options, QList<const char*> markedOptions)
{
int oldOptionCount = printers[currPrinterIndex].num_options;
cups_option_t* oldOptions = printers[currPrinterIndex].options;

int newOptionCount = 0;
cups_option_t* newOptions = 0;

// copying old options that are not on the new list
for (int i = 0; i < oldOptionCount; ++i) {
bool contains = false;
for (int j = 0; j < options.count(); ++j) {
if (qstrcmp(options.at(j)->keyword, oldOptions[i].name) == 0) {
contains = true;
break;
}
}

if (!contains) {
newOptionCount = _cupsAddOption(oldOptions[i].name, oldOptions[i].value, newOptionCount, &newOptions);
}
}

// we can release old option list
_cupsFreeOptions(oldOptionCount, oldOptions);

// adding marked options
for (int i = 0; i < markedOptions.count(); ++i) {
const char* name = markedOptions.at(i);
++i;
newOptionCount = _cupsAddOption(name, markedOptions.at(i), newOptionCount, &newOptions);
}

// placing the new option list
printers[currPrinterIndex].num_options = newOptionCount;
printers[currPrinterIndex].options = newOptions;

// saving new default values
_cupsSetDests(prnCount, printers);
}

QRect QCUPSSupport::paperRect(const char *choice) const
{
if (!currPPD)
return QRect();
for (int i = 0; i < currPPD->num_sizes; ++i) {
if (qstrcmp(currPPD->sizes[i].name, choice) == 0)
return QRect(0, 0, qRound(currPPD->sizes[i].width), qRound(currPPD->sizes[i].length));
}
return QRect();
}

QRect QCUPSSupport::pageRect(const char *choice) const
{
if (!currPPD)
return QRect();
for (int i = 0; i < currPPD->num_sizes; ++i) {
if (qstrcmp(currPPD->sizes[i].name, choice) == 0)
return QRect(qRound(currPPD->sizes[i].left),
qRound(currPPD->sizes[i].length - currPPD->sizes[i].top),
qRound(currPPD->sizes[i].right - currPPD->sizes[i].left),
qRound(currPPD->sizes[i].top - currPPD->sizes[i].bottom));
}
return QRect();
}

QStringList QCUPSSupport::options() const
{
QStringList list;
collectMarkedOptions(list);
return list;
}

bool QCUPSSupport::printerHasPPD(const char *printerName)
{
if (!isAvailable())
return false;
const char *ppdFile = _cupsGetPPD(printerName);
if (ppdFile)
unlink(ppdFile);
return (ppdFile != 0);
}

QString QCUPSSupport::unicodeString(const char *s)
{
#ifndef QT_NO_TEXTCODEC
return codec->toUnicode(s);
#else
return QLatin1String(s);
#endif
}

void QCUPSSupport::collectMarkedOptions(QStringList& list, const ppd_group_t* group) const
{
if (group == 0) {
if (!currPPD)
return;
for (int i = 0; i < currPPD->num_groups; ++i) {
collectMarkedOptions(list, &currPPD->groups[i]);
collectMarkedOptionsHelper(list, &currPPD->groups[i]);
}
} else {
for (int i = 0; i < group->num_subgroups; ++i)
collectMarkedOptionsHelper(list, &group->subgroups[i]);
}
}

void QCUPSSupport::collectMarkedOptionsHelper(QStringList& list, const ppd_group_t* group) const
{
for (int i = 0; i < group->num_options; ++i) {
for (int j = 0; j < group->options[i].num_choices; ++j) {
if (group->options[i].choices[j].marked == 1 && qstrcmp(group->options[i].choices[j].choice, group->options[i].defchoice) != 0)
list << QString::fromLocal8Bit(group->options[i].keyword) << QString::fromLocal8Bit(group->options[i].choices[j].choice);
}
}
}

QPair<int, QString> QCUPSSupport::tempFd()
{
char filename[512];
int fd = _cupsTempFd(filename, 512);
return QPair<int, QString>(fd, QString::fromLocal8Bit(filename));
}

// Prints the given file and returns a job id.
int QCUPSSupport::printFile(const char * printerName, const char * filename, const char * title,
int num_options, cups_option_t * options)
{
return _cupsPrintFile(printerName, filename, title, num_options, options);
}

QT_END_NAMESPACE

#endif // QT_NO_CUPS