qt实现界面显示和打印部分分离
来源：互联网 发布：dji视频编辑软件 编辑：程序博客网 时间：2024/05/01 10:06
1.需求
要求实现pos端结算时弹出找零界面同时进行打开钱箱打印，找零界面是阻塞对话框，
2.解决
1.采用多线程解决找零界面是ui 打印因为是通过html打印也是ui线程 qt规定所有ui只能在ui线程中 故无法导通
2.通过将html打印成图片 开打印线程将图片绘制到打印纸上 出现打印出来的东东较为模糊 故无法导通
3.将打印单独拎出来 打印时直接调用打印进程来搞 可以导通
3.代码
调用部分代码
void myprinter::on_testbtn_clicked(){ QString strExePath(""); strExePath = QCoreApplication::applicationDirPath() + "\\catprinter.exe"; //if (m_process.isOpen()) QString strHtml(""); strHtml += QString("<html>" "<head><style type=\"text/css\">" "body {margin-left:5%;}" "h1 {font-size:110%;text-align:center;width:100%;line-height:90%}" "h2 {font-size:100%;text-align:center;width=100%;line-height:90%}" "h3 {font-size:90%;text-align:center;width:100%;line-height:90%}"); strHtml += QString("th {font-size:%1%;text-align:left;margin-left:0;line-height:90%}" "td {font-size:%1%;text-align:left;margin-left:0;line-height:90%}" "table {border:0;width:90%}</style></head>").arg(65); //头部 strHtml += QString("<body>"); strHtml += QString("<h2>"); strHtml += QStringLiteral("8637品牌工厂店部分"); strHtml += QString("</h2>"); strHtml += QString("</body></html>"); QStringList list; list.push_back(strHtml); list.push_back(QString("80")); list.push_back(QString("1")); list.push_back(QString("GP-80160(Cut) Series")); list.push_back(QString("1")); list.push_back(QString("ST-1234567898776")); //QProcess process; m_process.startDetached(strExePath, list); //QMessageBox::information(this, "msg", "test");}打印进程 main.cpp
#include "catprinter.h"#include <QtWidgets/QApplication>#include <QtPrintSupport\QPrinter>#include <QtPrintSupport\QPrintDialog>#include <QtWebKitWidgets\QWebFrame>#include <QtWebKitWidgets\QWebPage>#include <QtWebKit\QWebElement>#include <QtGui\QPageSize>#include <QtCore\QRectF>#include <QtGui\QPainter>#include <QtGui\QTextDocument>#include <QtCore\QFile>#include <QtCore\QTextCodec>#include <QPrinterInfo>#include <windows.h>#include <QStringList>#include "zint.h"#ifdef _DEBUG#pragma comment(lib, "../Win32/Debug/zintd.dll.lib")#else#pragma comment(lib, "../Win32/Release/zint.dll.lib")#endiftypedef struct stHtml{ bool bBarcode; int nTicketSize; int nPages; QString strPrinterName; QString strTicket;}S_HTML;void printHtml(const QString &strHtml, S_HTML &shtml);bool drawBarcode(QPainter &painter, const QString &strImagePath, const QRect &rtBarcode, int width);int main(int argc, char *argv[]){ QApplication a(argc, argv); QString strHtml(""); QStringList list = QCoreApplication::arguments(); S_HTML shtml; if (list.count() > 6) { strHtml = list[1]; shtml.nTicketSize = list[2].toInt();//stSetInfo.nTicketSize; shtml.nPages = list[3].toInt();//stSetInfo.nPages; shtml.strPrinterName = list[4];//stSetInfo.strPrinterName; shtml.bBarcode = list[5].toInt();//mapFormat[E_PRINT_BARCODE]; //modified by zrq 20150930 shtml.strTicket = list[6];//stInfo.strTicket; printHtml(strHtml, shtml); //return a.exec(); } else //return 0; //这里调用打印机进行打印 return 0; //a.exec();}void printHtml(const QString &strHtml, S_HTML &shtml){ if (shtml.strPrinterName.isEmpty()) return; QPrinter printer; printer.setPrinterName(shtml.strPrinterName); //貌似没什么用，不过我还是设置了下 printer.setFullPage(true); //计算在打印机的DPI下，58mm对应的点数 int dpi=printer.logicalDpiX(); int width=min(shtml.nTicketSize, printer.paperRect(QPrinter::Millimeter).width())*(dpi*1.0/25.4);//58mm //使用QWebPage来解析并输出解析后的文档到打印机 QWebPage page; page.mainFrame()->setHtml(strHtml); QWebFrame *frame=page.mainFrame(); //设置网页视口大小，因为我在html文档中用相对大小布局的 page.setViewportSize(QSize(width,frame->findFirstElement("body").geometry().height())); if (!shtml.bBarcode) { for (int npage = 0; npage < shtml.nPages;) { QPainter painter(&printer); if (painter.isActive()) frame->render(&painter); ++npage; } } else { QString strTicket(shtml.strTicket); if (strTicket.length() > 3) strTicket = strTicket.mid(3); QString strImagePath(""); strImagePath = QCoreApplication::applicationDirPath() + "//test.png"; struct zint_symbol * my_symbol = ZBarcode_Create(); my_symbol->symbology = BARCODE_CODE93;//BARCODE_CODE11; strcpy(my_symbol->outfile, strImagePath.toLocal8Bit().toStdString().c_str()); ZBarcode_Encode(my_symbol, (unsigned char*)strTicket.toLocal8Bit().toStdString().c_str(), 0); ZBarcode_Print(my_symbol, 0); ZBarcode_Delete(my_symbol); QSize imgsize(width, frame->findFirstElement("table.barcode").geometry().height()); QRect rtBarcode(2, frame->findFirstElement("table.barcode").geometry().top(), imgsize.width(), imgsize.height()); for (int npage = 0; npage < shtml.nPages;) { //这里修改下直接打印到图片上看下效果 QPainter painter(&printer); if (painter.isActive()) frame->render(&painter); drawBarcode(painter, strImagePath, rtBarcode, width); ++npage; } }}bool drawBarcode(QPainter &painter, const QString &strImagePath, const QRect &rtBarcode, int width){ QImage image(strImagePath, "PNG"); QRect rt1 = image.rect(); QRect rtwindow = painter.window(); QRect rtview = painter.viewport(); int nmax = 0; if (image.width() + 20 < width) nmax = max(image.width() + 20, width); else nmax = min(image.width() + 20, width); QRect rtimage(0, 0, nmax, rtwindow.height()); QRect rtimageview(0, 0, nmax, rtview.height()); int nmin = min(image.width(), nmax - 80); QRectF rtdes(40, rtBarcode.top(), nmin, rtBarcode.height()); QRectF rtsrc(0, 0, image.width(), image.height()); painter.setWindow(rtimage); painter.setViewport(rtimageview); painter.drawImage(rtdes, image, rtsrc); painter.setWindow(rtwindow); painter.setViewport(rtview); return true;}4.备注
1.完整测试部分代码:http://download.csdn.net/detail/zhang_ruiqiang/9173255
2.调用时也可以将调用打印部分放在线程中，在线程中调用打印进程
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