关于转化API的Google App Engine文档不完整 [英] Incomplete Google App Engine Documentation on Conversion API
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问题描述
我试图将HTML字符串转换为.PNG文件。感谢说资产的名称应该匹配img标签的src属性。
这是我在交互式控制台中尝试的一段python代码，并且它实际上从google.appengine.api生成了两张图片
从google.appengine.api导入urlfetch
导入转换
url =http://a0.twimg.com/profile_images/77186109/favicon_reasonably_small.png
asset = conver sion.Asset（text / html，'< b>一些数据< / b>< br />< img src =a.png/>< img src =％s/ >< br /> Foo'％url，test.html）
conversion_obj = conversion.Conversion（资产，image / png）
img_response = urlfetch.fetch （url）
image1 = conversion.Asset（'image / png'，img_response.content，a.png）
image2 = conversion.Asset（'image / png'，img_response.content，url ）
conversion_obj.add_asset（image1）
conversion_obj.add_asset（image2）
结果= conversion.convert（conversion_obj）
打印result.error_text
print repr（result.assets [0] .data）
I am trying to convert a HTML string into a .PNG file. Thanks to Nick Johnson who pointed me to GAE Conversion API see previous post Here.
I use the GAE Conversion API which works but my images in my HTML string doesn't display.
In the Documentation on GAE Conversion API there is a reference to Adding Assets and a mention of static/icon.gif which I think may address my problem but that documentation is incomplete.
Can anyone please assist?
My HTML conversion to .PNG works but all images e.g
<img src="http://mydomain.com/image.gif> doesn't print yet http://mydomain.com/image.gif is available.
Thanks
PB
Update 1: According to the documentation, I should create seperate asset for each image and name must match the src attr.
List<Asset>assets = new ArrayList<Asset>();
try {
Asset asset = new Asset("text/html", notification.getMessage().getBytes("UTF-8"), "testfile.html");
assets.add(asset);
} catch (UnsupportedEncodingException e) {
e.printStackTrace();
}
winningNumbers is just a number, expecting 5 0r 6 numbers
for (String n : winningNumbers) {
String url = "http://www.someURL.com/img/balls/" + n +".gif";
Asset e = new Asset("image/gif", loadGIFByte(url), url);
assets.add(e);
}
Document document = new Document(assets);
//Here I want to convert everything, the images and html to a .PNG MIMETYPE.
Conversion conversion = new Conversion(document, "image/png");
ConversionService service = ConversionServiceFactory.getConversionService();
ConversionResult conversionResult = service.convert(conversion);
private byte[] loadGIFByte(String urlGIF) {
System.out.println("Loading GIF for "+ urlGIF);
OutputStream out = new ByteArrayOutputStream();
byte[] buf = new byte[1536];
int count = 0;
try {
URL u = new URL(urlGIF);
InputStream reader = u.openStream();
while ((count = reader.read(buf)) >= 0) {
out.write(buf, 0, count);
}
} catch (MalformedURLException e) {
e.printStackTrace();
} catch (IOException e) {
e.printStackTrace();
}
return buf;
}
}
Update 2:
A typical notification.getMessage() should return;
<html>
<head>
<style type="text/css">
/** Add css rules here for your application. *//** Example rules used by the template application (remove for your app) */h1 { font-size: 2em; font-weight: bold; color: #777777; margin: 40px 0px 70px; text-align: center;}.sendButton { display: block; font-size: 16pt;}/** Most GWT widgets already have a style name defined */.gwt-DialogBox { width: 400px;}.dialogVPanel { margin: 5px;}.serverResponseLabelError { color: red;}/** Set ids using widget.getElement().setId("idOfElement") */#closeButton { margin: 15px 6px 6px;}.usefulLinksUL{list-style-type:none;margin:0;padding:0;display:block;font-weight:bold;#background-color:#FFD700;width:180px;}.usefulLinksAnchor{a:link,a:visited;text-decoration:none;a:hover,a:active;}.note {font-size: 80%;background-color: #FEF49E;/**background-color: #d8da3d;*/border: 1px solid #D0C98D;-webkit-box-shadow: -8px 5px 5px rgba(0, 0, 0, 0.3);}.note-title {margin: 5px 5px 0 5px;padding: 4px;-moz-border-radius: 5px;-webkit-border-radius: 5px;background-color: #D0C98D;color: white;font-weight: bolder;}.note-content {margin: 5px;background: transparent;border: none;overflow: hidden;}.container { width:50px; overflow:hidden }.cube { width:150px; height:150px; float:left;}#rounded-corner{ font-family: "Lucida Sans Unicode", "Lucida Grande", Sans-Serif; font-size: 12px; margin: 5px; /*width: 180px;*/ text-align: left; border-collapse: collapse;}#rounded-corner thead th.rounded-company{ background: #b9c9fe url('img/latestResult/left.png') left -1px no-repeat;}#rounded-corner thead th.rounded-q4{ background: #b9c9fe url('img/latestResult/right.png') right -1px no-repeat;}#rounded-corner th{ padding: 8px; font-weight: normal; font-size: 13px; color: #039; background: #b9c9fe;}#rounded-corner td{ padding: 8px; background: #e8edff; border-top: 1px solid #fff; color: #669;}#rounded-corner tfoot td.rounded-foot-left{ background: #e8edff url('img/latestResult/botleft.png') left bottom no-repeat;}#rounded-corner tfoot td.rounded-foot-right{ background: #e8edff url('img/latestResult/botright.png') right bottom no-repeat;}#rounded-corner tbody tr:hover td{ background: #d0dafd;}.latestLotto{ background-color: #C3D9FF; border: 1px solid #87B3FF; cursor: default; }.bbottomyello {border-bottom: 1px solid #CFA55B;}.onGreenBackground {font-family: Arial, Helvetica, sans-serif;font-size: 11px;color: white;font-style: normal;}.btopbottomYellow {border-top: 1px solid #FFCB05;border-bottom: 1px solid #FFCB05;}.bbottomYellow {border-bottom: 1px solid #FFCB05;}h3 {font-family: Arial, Helvetica, sans-serif;font-size: 11px;color: #EB0900;}
</style>
</head>
<body>
<table width="100%" height="123" border="0" cellpadding="0" cellspacing="0" bgcolor = "#FFFFFF">
<tbody><tr>
<td width="47%" class="bbottomyello"><img src="http://mylottoshop.appspot.com//img/lotto_top_left_home.gif" alt=""></td>
<td width="16%" class="bbottomyello"> </td>
<td colspan="3" valign="top" class="bbottomYellow"> </td>
</tr>
<tr>
<td valign="top" bgcolor="#00A452"> <span class="onGreenBackground"><span class="onGreenBackground">Wednesday, June 13 2012</span></span></td>
<td colspan="4" bgcolor="#00A452" class="onGreenBackground">Latest Results: Confirmed</td>
</tr>
<tr>
<td height="23" colspan="5" class="btopbottomYellow"> <strong> Winning Numbers</strong></td>
</tr>
<tr>
<td height="31" colspan="2" class="bbottomYellow">
<div align="center">
<img src="http://mylottoshop.appspot.com//img/balls/9.gif" width="30" height="40">
<img src="http://mylottoshop.appspot.com//img/balls/20.gif" width="30" height="40">
<img src="http://mylottoshop.appspot.com//img/balls/14.gif" width="30" height="40">
<img src="http://mylottoshop.appspot.com//img/balls/16.gif" width="30" height="40">
<img src="http://mylottoshop.appspot.com//img/balls/43.gif" width="30" height="40">
<img src="http://mylottoshop.appspot.com//img/balls/41.gif" width="30" height="40">
</div>
</td>
<td width="12%" height="31" valign="middle" class="bbottomYellow"><h3>Bonus<br>
Ball:</h3></td>
<td width="14%" class="bbottomYellow"> <div align="center"><img src="http://mylottoshop.appspot.com//img/balls/13.gif" width="34" height="40"></div></td>
</tr>
</tbody></table></body>
</html>
Notification class signature is:
public class Notification implements Serializable{
/**
*
*/
private static final long serialVersionUID = -8464293752450599178L;
private Result result;
private NotificationClientType client;
private String message;
private String api_key;
private String secret_key;
private String deliveryAddress; //e.g email, fax etc
public NotificationClientType getClient() {
return client;
}
public void setClient(NotificationClientType client) {
this.client = client;
}
public String getMessage() {
return message;
}
public void setMessage(String message) {
this.message = message;
}
public String getApi_key() {
return api_key;
}
public void setApi_key(String api_key) {
this.api_key = api_key;
}
public String getSecret_key() {
return secret_key;
}
public void setSecret_key(String secret_key) {
this.secret_key = secret_key;
}
public String getDeliveryAddress() {
return deliveryAddress;
}
public void setDeliveryAddress(String deliveryAddress) {
this.deliveryAddress = deliveryAddress;
}
public Result getResult() {
return result;
}
public void setResult(Result result) {
this.result = result;
}
Some Feedback. No difference in result. I guess return out.toByteArray() solved NPE which I accidentally caused.
The expected result is below: The same HTML string sent as email yields:
GAE conversion result is:
解决方案
The documentation says that the name of the asset should match the src attribute of the img tag.
Here is a python code I tried in the interactive console, and it actually produced the two images
from google.appengine.api import urlfetch
from google.appengine.api import conversion
url = "http://a0.twimg.com/profile_images/77186109/favicon_reasonably_small.png"
asset = conversion.Asset("text/html", '<b>some data</b><br/><img src="a.png"/><img src="%s"/><br/>Foo' % url, "test.html")
conversion_obj = conversion.Conversion(asset, "image/png")
img_response = urlfetch.fetch(url)
image1 = conversion.Asset('image/png', img_response.content, "a.png")
image2 = conversion.Asset('image/png', img_response.content, url)
conversion_obj.add_asset(image1)
conversion_obj.add_asset(image2)
result = conversion.convert(conversion_obj)
print result.error_text
print repr(result.assets[0].data)
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