如何在 Odoo/OpenERP 的 mako 报告中打印条形码？

Question

我可以在报告中打印这样的静态图像：

<img src="data:image/png;base64,${obj.company_id.logo}"/>

我可以像这样以 base64 代码打印图像：

<img src="data:image/png;base64,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" style="width:300px;height:50px" /> 

但是如何从 url 打印图像？有没有办法在呈现报告时将图像动态编码为base64？

<img src="img/logo.png" />

其实我想做的是在使用 mako 创建的报告中打印条形码。条形码是使用 url 使用控制器创建的，所以我需要像这样创建条形码图像：

<img src="/report/barcode/?type=EAN13&amp;value=5546903283256&amp;width=600&amp;height=100" style="width:300px;height:50px"/>

我怎样才能做到这一点？

更新：我也试过这个

<img src="/report/barcode/?type=EAN13&value=5546903283256&width=600&height=100" style="width:300px;height:50px"/>

如果我同时尝试最后两个选项，则会收到此错误：

ERROR dnname openerp.service.report: Exception: ('Webkit error', "The command 'wkhtmltopdf' failed with error code = 1. Message: The following diagnosis message was provided:\nExit with code 1 due to network error: ContentNotFoundError\n")
Traceback (most recent call last):
  File "/opt/odoo/odoo_pan/src/openerp/service/report.py", line 93, in go
    result, format = openerp.report.render_report(cr, uid, ids, object, datas, context)
  File "/opt/odoo/odoo_pan/src/openerp/report/__init__.py", line 40, in render_report
    return registry['ir.actions.report.xml'].render_report(cr, uid, ids, name, data, context)
  File "/opt/odoo/odoo_pan/src/openerp/api.py", line 268, in wrapper
    return old_api(self, *args, **kwargs)
  File "/opt/odoo/odoo_pan/src/addons/base/ir/ir_actions.py", line 156, in render_report
    return new_report.create(cr, uid, res_ids, data, context)
  File "/opt/odoo/odoo_pan/src/addons/report_webkit/webkit_report.py", line 377, in create
    result = self.create_source_pdf(cursor, uid, ids, data, report_xml, context)
  File "/opt/odoo/odoo_pan/src/openerp/report/report_sxw.py", line 462, in create_source_pdf
    return self.create_single_pdf(cr, uid, ids, data, report_xml, context)
  File "/opt/odoo/odoo_pan/src/addons/report_webkit/webkit_report.py", line 358, in create_single_pdf
    pdf = self.generate_pdf(bin, report_xml, head, foot, htmls)
  File "/opt/odoo/odoo_pan/src/addons/report_webkit/webkit_report.py", line 220, in generate_pdf
    _("The command 'wkhtmltopdf' failed with error code = %s. Message: %s") % (status, error_message))
except_orm: ('Webkit error', "The command 'wkhtmltopdf' failed with error code = 1. Message: The following diagnosis message was provided:\nExit with code 1 due to network error: ContentNotFoundError\n")

Answer 1

最后我创建了一个新的计算域来获取base64代码

class StockMove(models.Model):
    _inherit = "stock.move"

    barcode_image = fields.Text(
        string='Barcode image',
        compute='_compute_barcode_image',
    )

    @api.one
    @api.depends('product_id')
    def _compute_barcode_image(self):
        if self.product_id.product_tmpl_id.ean13:
            try:
                barcode = self.env['report'].barcode(
                    'EAN13',
                    self.product_id.product_tmpl_id.ean13,
                    width=300,
                    height=50,
                    humanreadable=0
                )
            except (ValueError, AttributeError):
                raise Warning(_('Cannot convert into barcode.'))
            barcode_base64 = base64.b64encode(barcode)
            self.barcode_image = 'data:image/png;base64,' + barcode_base64
        else:
            self.barcode_image = None

我在 mako 报告中添加了这个：

%if line.product_id and line.product_id.ean13:
    <span>
        <img src="${line.barcode_image}" 
             style="width:300px; height:50px" />
    </span>
%endif 

Answer 2

这可能只是一个格式错误。尝试改变“&”到'&'：

<img src="/report/barcode/?type=EAN13&value=5546903283256&width=600&height=100" style="width:300px;height:50px;"/>

多个 GET 参数用 '&' 分隔。

顺便说一句：为什么不使用参数来获得正确的图像大小而无需事后对其进行样式设置：

<img src="/report/barcode/?type=EAN13&value=5546903283256&width=300&height=50" />