Qt linux打印机封装类QCUPSSupport
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q_cups_p.h
#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_NAMESPACEQ_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 zhangpfpublic: 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#endifq_cups.cpp
#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_NAMESPACEtypedef 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阅读全文
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