[英]PDFLib Factory. Error when calling $this->pdf from functions within class
想法如下,为了使PDF的创建更加简洁,我应该创建一个Factory / Abstract类,该类将具有一组预定义的函数,如下所示
class AbstractPDF{
protected $pdf;
protected $searchpath;
public function __construct(){
$this->pdf = PDF_new();
$this->searchpath = "fonts/";
pdf_set_option($this->pdf,"errorpolicy=return");
pdf_set_option($this->pdf,"searchpath={" . $this->searchpath . "}");
pdf_set_option($this->pdf,"stringformat=utf8");
}
protected function startAFourPage(){
pdf_begin_page_ext($this->pdf, 0, 0, "width=a4.width height=a4.height");
}
/* When setting up any of the PDF content types, one should */
/* remember that in PDFLib, x=>y axis start with 0(zero) at */
/* lower left corner. */
/* The text line is set up in space by setting up the */
/* coordinates of the lower left corner and then providing */
/* height and width of the object as separate values */
protected function setupTextLine($xcoordinate, $ycoordinate, $width, $height,
$fontName, $fontEncoding, $fontSize, $text, $textPosition = "left"){
//adding text directly through the PDFLib documentation
$font = PDF_load_font($this->pdf, $fontName, $fontEncoding, "");
PDF_setfont($this->pdf, $font, $fontSize);
//PDF_set_text_pos($this->pdf, 25, 650);
//PDF_show($this->pdf, $text);
PDF_fit_textline ($this->pdf, $text, 111, 744, "boxsize {".$width." ".$height."} position=left");
}
/* When setting up any of the PDF content types, one should */
/* remember that in PDFLib, x=>y axis start with 0(zero) at */
/* lower left corner. */
/* The text flow is set up by providing the coordinate for */
/* lower left corner and upper right, as a rule. */
/* But overall PDFLib will placed it by coordinates for */
/* two corners diagonal to each other. */
/* For this class we will identify these corners as */
/* lowLeft and upperRight */
protected function setupMultilineTextflow($lowLeftX, $lowLeftY, $upperRightX, $upperRightY,
$fontName, $fontEncoding, $fontSize, $text){
$orderDetails = 'Datum:
Auftrags-NR:
Auftragsname:
Kunden-Nr:';
$textFlow = PDF_create_textflow($this->pdf, $text,
"fontname=".$fontName."
fontsize=".$fontSize."
encoding=".$fontEncoding);
PDF_fit_textflow($this->pdf, $textFlow3, $lowLeftX, $lowLeftY, $upperRightX, $upperRightY,"");
}
protected function setupTable($headers=array('test'=>''), array $field){
}
}
?>
这个类是从下面调用的
class PDF extends AbstractPDF{
public function __construct(){
parent::__construct();
parent::startAFourPage();
}
public function generateContent(){
return "";
}
}
对于有这么多代码,我深表歉意,但我想画一幅全景图。
问题是,当我尝试调用这些类时,出现以下错误:
2017/12/19 18:47:58 [错误] 465#465:* 252 FastCGI在stderr中发送:“ PHP消息:PHP致命错误:未捕获PDFlibException:不得在/ var / www的'object'范围内调用函数/dev-vm-stretch.de/htdocs/AbstractPDF.php:30
堆栈跟踪:
#0 /var/www/dev-vm-stretch.de/htdocs/AbstractPDF.php(30):pdf_begin_page_ext(资源ID#1、0、0,'width = a4.width ...')
#1 /var/www/dev-vm-stretch.de/htdocs/PDF.php(10):AbstractPDF-> startAFourPage()
#2 /var/www/dev-vm-stretch.de/htdocs/index.php(18):PDF-> __ construct()
#3 {main}
在从上游读取响应头的过程中,在第30行上的/var/www/dev-vm-stretch.de/htdocs/AbstractPDF.php中抛出:客户端:192.168.34.51,服务器:dev-vm-stretch.de,请求: GET /index.php HTTP / 1.1”,上游:“ fastcgi:// unix:/var/run/php/php7.0-fpm.sock:”,主机:“ dev-vm-stretch.de”
我认为这是因为我将与PDFLib相关的代码分成了函数,但是我不确定100%,因为我的PDFLib经验仅限于5天多一点,而且我还没有找到任何可解决此类问题的PDFLib教程。 :-(
欢迎就如何解决此错误提出任何想法。
问题很简单。 只有具有输出文档时,才能创建页面。 使用begin_document($file, $options);
创建一个新的输出文档begin_document($file, $options);
您也可以使用__construct
。
您可以查看PDFlib 9.1.1 API参考的第1.2章“功能范围”。 另外,所有PDFlib PHP示例(包括PDFlib PHP软件包中的示例)都演示了正确的用法。
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