Question

我正在编写一个Qt桌面程序，需要在交易后打印收据。为此我需要发一份＆＃34;剪纸＆＃34;在每张收据的最后。据我所知，需要在打印文本的末尾发送以下ascii字符（ascii 27 + ascii 105）来剪纸。

我找不到任何有关如何使用QPrinter发送此文档的文档。我使用QPrinter＆amp; QPainter实现打印。

如果有人试过这个，请在Qt。中建议如何处理剪纸打印机命令。

Answer 1

我找到了这个问题的答案并发布了这个问题，以便它可能对其他人有用。

我使用append（ascii character）命令将打印机命令附加到打印机。

以下是我使用的示例代码：

QString printer_name = "PrinterOne";
qDebug() << "Test printing started...";

QByteArray print_content_ba("Test Print text ");
print_content_ba.append("\n");

//add end of the receipt buffer & cut command
print_content_ba.append(27);
print_content_ba.append(105);

HANDLE p_hPrinter;
DOC_INFO_1 DocInfo;
DWORD   dwJob = 0L;
DWORD   dwBytesWritten = 0L;
BOOL    bStatus = FALSE;

//code to convert QString to wchar_t
wchar_t szPrinterName[255];
int length = printer_name.toWCharArray(szPrinterName);
szPrinterName[length]=0;

if (OpenPrinter(szPrinterName,&p_hPrinter,NULL)){
qDebug() << "Printer opening success " << QString::fromWCharArray(szPrinterName);
DocInfo.pDocName = L"Loyalty Receipt";
DocInfo.pOutputFile = NULL;
DocInfo.pDatatype = L"RAW";
dwJob = StartDocPrinter( p_hPrinter, 1, (LPBYTE)&DocInfo );
if (dwJob > 0) {
    qDebug() << "Job is set.";
    bStatus = StartPagePrinter(p_hPrinter);
    if (bStatus) {
        qDebug() << "Writing text to printer" << print_content_ba ;
        bStatus = WritePrinter(p_hPrinter,print_content_ba.data(),print_content_ba.length(),&dwBytesWritten);
        if(bStatus > 0){
            qDebug() << "printer write success" << bStatus;
        }
        EndPagePrinter(p_hPrinter);
    } else {
        qDebug() << "could not start printer";
    }
    EndDocPrinter(p_hPrinter);
    qDebug() << "closing doc";
} else {
    qDebug() << "Couldn't create job";
}
ClosePrinter(p_hPrinter);
qDebug() << "closing printer";
}
else{
   qDebug() << "Printer opening Failed";
}

Answer 2

尽管我的问题没有确切答案，我的收据打印机正在运行。 “cut”命令由print命令中的TmxPaperSource=DocFeedCut参数给出。

我制作PDF然后将其发送到打印机（我不打印正常收据......）。

void printSomething(QGraphicsScene* scene)
{
    /* Make a PDF-Printer */
    QPrinter pdfPrinter(QPrinter::ScreenResolution);
    pdfPrinter.setOutputFormat( QPrinter::PdfFormat );
    pdfPrinter.setPaperSize( QSize(100, 80), QPrinter::Millimeter );
    pdfPrinter.setPageMargins( QMarginsF(2, 0, 5.8, 0) ); //dont set top and bottom margins
    pdfPrinter.setColorMode(QPrinter::GrayScale);
    pdfPrinter.setResolution(203); //dpi of my printer
    pdfPrinter.setFullPage(true);
    pdfPrinter.setOutputFileName( "hello.pdf" );

    /* Render the Scene using the PDF-Printer */
    QPainter pdfPainter;
    pdfPainter.begin( &pdfPrinter );
    scene->render( &pdfPainter );
    pdfPainter.end();

    /* Print */
    system( std::string("lp -o PageSize=RP80x297 -o TmxPaperReduction=Bottom -o Resolution=203x203dpi -o TmxPaperSource=DocFeedCut -o TmxMaxBandWidth=640  -o TmxPrintingSpeed=auto hello.pdf").c_str() );
}

如何使用Qt QPrinter发送剪纸命令

2 个答案: