useshellexecute

浅谈Web打印服务

服务器侦听http端⼝，接收客户端传来的的url下载，本地打印，要求客户端和服务器在同⼀个⽹内，打印机共享。

主要代码如下，需要引⽤,

classiLisen

{

///

///打印⽂件按默认⽅式

///

///⽂件路径

///打印机名称

privateboolprintfile(stringfilePath,stringprinter)

{

try

{

if(printer=="")

{

PrintDocumentfPrintDocument=newPrintDocument();

printer=rName;

}

ProcessStartInfoinfo=newProcessStartInfo();

nts="""+printer+""";

llExecute=true;

NoWindow=true;

="PrintTo";

me=filePath;

NoWindow=true;

Style=;

Processp=newProcess();

nfo=info;

();

rInputIdle();

();

returntrue;

}

catch(Exceptione)

{

returnfalse;

}

}

///

///读取指定key的值

///

///

///

publicstringGetConfigValue(stringkey)

{

urationconfig=

eConfiguration();

if(gs[key]==null)

return"";

else

gs[key].Value;

}

///

///Http⽅式下载⽂件

///

///http地址

///本地⽂件

///

publicboolDownloadFile(stringurl,stringlocalfile,stringcookie="")

{

boolflag=false;

longstartPosition=0;//上次下载的⽂件起始位置

FileStreamwriteStream;//写⼊本地⽂件流对象

if((localfile))

{

//⽂件存在直接删掉重建

(localfile);

}

writeStream=newFileStream(localfile,);//⽂件不保存创建⼀个⽂件

startPosition=0;

try

{

HttpWebRequestmyRequest=(HttpWebRequest)(url);//打开⽹络连接

("Cookie",cookie);

if(startPosition>0)

{

ge((int)startPosition);//设置Range值,与上⾯的⽤意相同,是为了定义远程⽂件读取位置

}

using(StreamreadStream=ponse().GetResponseStream())//向服务器请求,获得服务器的回应数据流

{

byte[]btArray=newbyte[512];//定义⼀个字节数据,⽤来向readStream读取内容和向writeStream写⼊内容

intcontentSize=(btArray,0,);//向远程⽂件读第⼀次

while(contentSize>0)//如果读取长度⼤于零则继续读

{

(btArray,0,contentSize);//写⼊本地⽂件

contentSize=(btArray,0,);//继续向远程⽂件读取

}

//();

}

FileInfofi=newFileInfo(localfile);

longilen=;

if(ilen<2000)

{

flag=false;//⽂件空⽩

}

else

{

flag=true;//返回true下载成功

}

}

catch(Exceptionex)

{

flag=false;//返回false下载失败

}

finally

{

();

}

returnflag;

}

intmaxThreadNum,portThreadNum;

//线程池

intminThreadNum;

Threads(outmaxThreadNum,outportThreadNum);

Threads(outminThreadNum,outportThreadNum);

ine("s：{0}",maxThreadNum);

ine("reads：{0}",minThreadNum);

//serWorkItem(newWaitCallback(TaskProc1),x);

stringprinterset=GetConfigValue("printer");

if(printerset=="")

{

//没有设置就使⽤默认打印机

PrintDocumentfPrintDocument=newPrintDocument();

printerset=rName;

}

ine("Printername="+printerset);

ine("nnWaitingforconnection...nn");

while(true)

{

//等待请求连接

//没有请求则GetContext处于阻塞状态

stringistatus="";

try

{

HttpListenerContextctx=text();

if(f("printurl=")>=0)

{

stringrescon=ng();

stringurltest=('=')[1];

stringfilename=('/')[('/').Length-1];

ine(ng("yyyy-MM-ddHH:mm:ss"));

ine(urltest);

booldownloadstatus=DownloadFile(urltest,"temp"+filename);

ine("Downloadfile"+filename+"..."+ng());

boolprintstatus=doprint("temp"+filename,printerset);

ine("Printfile"+filename+"..."+ng());

HttpListenerResponseresponse=se;

Code=200;

tType="application/json;charset=UTF-8";

tEncoding=8;

Header("Content-Type","application/json;charset=UTF-8");

using(StreamWriterwriter=newStreamWriter(Stream,8))

{

if(downloadstatus&&printstatus)

{

("ok");

}

else

{

("failed!"+"Download"+ng()+".Print"+ng());

}

();

();

}

}

else

{

HttpListenerResponseresponse=se;

Code=201;

tType="application/json;charset=UTF-8";

tEncoding=8;

Header("Content-Type","application/json;charset=UTF-8");

using(StreamWriterwriter=newStreamWriter(Stream,8))

{

("failed");

();

();

}

}

}

catch(Exceptionex)

{

ine(e);

}

}

();

}

}

catch(Exceptione)

{

ine(e);

HttpListenerlisterner=newHttpListener();

HttpListenerContextctx=text();

HttpListenerResponseresponse=se;

}

}

}

//调⽤⽅式

staticvoidMain(string[]args)

{

try

{

if(("temp"))

{

("temp",true);

}

Directory("temp");

}

catch(Exceptionex)

{

ine("CreateDirectorytempfailed!");

ine("");

ine(e);

return;

}

iLisennewlisten=newiLisen();

isen();

}

//客户端通过get⽅式访问，可以在浏览器测试打印效果，⽹址在上⽅设置

//打印动作通过⽂件默认打开⽅式打印，因此打印pdf⽂件需要安装个pdf打开⼯具，如foxitpdfreader