Multithreading 使用Indy的全局、线程安全的Cookie manager
我的Delphi 2010应用程序使用多线程上传内容,上传的数据发布到需要登录的PHP/web应用程序,因此我需要使用共享/全局cookie管理器(我使用的是Indy10修订版4743),因为TIdCookieManager不是线程安全的:( 此外,服务器端会话id每5分钟自动重新生成一次,因此我必须保持全局和本地cookie管理器同步 我的代码如下所示:Multithreading 使用Indy的全局、线程安全的Cookie manager,multithreading,delphi,delphi-2010,indy,Multithreading,Delphi,Delphi 2010,Indy,我的Delphi 2010应用程序使用多线程上传内容,上传的数据发布到需要登录的PHP/web应用程序,因此我需要使用共享/全局cookie管理器(我使用的是Indy10修订版4743),因为TIdCookieManager不是线程安全的:( 此外,服务器端会话id每5分钟自动重新生成一次,因此我必须保持全局和本地cookie管理器同步 我的代码如下所示: TUploadThread = class(TThread) // ... var GlobalCookieManager : TI
TUploadThread = class(TThread)
// ...
var
GlobalCookieManager : TIdCookieManager;
procedure TUploadThread.Upload(FileName : String);
var
IdHTTP : TIdHTTP;
TheSSL : TIdSSLIOHandlerSocketOpenSSL;
TheCompressor : TIdCompressorZLib;
TheCookieManager : TIdCookieManager;
AStream : TIdMultipartFormDataStream;
begin
ACookieManager := TIdCookieManager.Create(IdHTTP);
// Automatically sync cookies between local & global Cookie managers
@TheCookieManager.OnNewCookie := pPointer(Cardinal(pPointer( procedure(ASender : TObject; ACookie : TIdCookie; var VAccept : Boolean)
begin
OmniLock.Acquire;
try
GlobalCookieManager.CookieCollection.AddCookie(ACookie, TIdHTTP(TIdCookieManager(ASender).Owner).URL{IdHTTP.URL});
finally
OmniLock.Release;
end; // try/finally
VAccept := True;
end )^ ) + $0C)^;
// ======================================== //
IdHTTP := TIdHTTP.Create(nil);
with IdHTTP do
begin
HTTPOptions := [hoForceEncodeParams, hoNoParseMetaHTTPEquiv];
AllowCookies := True;
HandleRedirects := True;
ProtocolVersion := pv1_1;
IOHandler := TheSSL;
Compressor := TheCompressor;
CookieManager := TheCookieManager;
end; // with
OmniLock.Acquire;
try
// Load login info/cookies
TheCookieManager.CookieCollection.AddCookies(GlobalCookieManager.CookieCollection);
finally
OmniLock.Release;
end; // try/finally
AStream := TIdMultipartFormDataStream.Create;
with Stream.AddFile('file_name', FileName, 'application/octet-stream') do
begin
HeaderCharset := 'utf-8';
HeaderEncoding := '8';
end; // with
IdHTTP.Post('https://www.domain.com/post.php', AStream);
AStream.Free;
end;
procedure TUploadThread.Upload(FileName : String);
var
IdHTTP : TIdHTTP;
TheSSL : TIdSSLIOHandlerSocketOpenSSL;
TheCompressor : TIdCompressorZLib;
TheCookieManager : TIdCookieManager;
TheStream : TIdMultipartFormDataStream;
begin
IdHTTP := TIdHTTP.Create(nil);
try
...
TheCookieManager := TIdCookieManager.Create(IdHTTP);
TheCookieManager.OnNewCookie := NewCookie;
with IdHTTP do
begin
HTTPOptions := [hoForceEncodeParams, hoNoParseMetaHTTPEquiv];
AllowCookies := True;
HandleRedirects := True;
ProtocolVersion := pv1_1;
IOHandler := TheSSL;
Compressor := TheCompressor;
CookieManager := TheCookieManager;
end; // with
OmniLock.Acquire;
try
// Load login info/cookies
TheCookieManager.CookieCollection.AddCookies(GlobalCookieManager.CookieCollection);
finally
OmniLock.Release;
end;
TheStream := TIdMultipartFormDataStream.Create;
try
with TheStream.AddFile('file_name', FileName, 'application/octet-stream') do
begin
HeaderCharset := 'utf-8';
HeaderEncoding := '8';
end;
IdHTTP.Post('https://www.domain.com/post.php', TheStream);
finally
TheStream.Free;
end;
finally
IdHTTP.Free;
end;
end;
但它不起作用!我在调用AddCookies()时遇到此异常
Project MyEXE.exe引发异常类EAccessViolation,并显示消息
'地址00000000处的访问冲突。读取地址00000000'
我还尝试使用assign(),即
但我仍然得到同样的例外,通常在这里:
TIdCookieManager.GenerateClientCookies()
有人知道如何解决这个问题吗?如果让我猜的话,我会说你的问题就在这里的某个地方:
// Automatically sync cookies between local & global Cookie managers
@TheCookieManager.OnNewCookie := pPointer(Cardinal(pPointer( procedure(ASender : TObject; ACookie : TIdCookie; var VAccept : Boolean)
begin
OmniLock.Acquire;
try
GlobalCookieManager.CookieCollection.AddCookie(ACookie, TIdHTTP(TIdCookieManager(ASender).Owner).URL{IdHTTP.URL});
finally
OmniLock.Release;
end; // try/finally
VAccept := True;
end )^ ) + $0C)^;
我不确定$0C
这个神奇的数字是用来做什么的,但我敢打赌所有这些类型转换都在那里,因为你花了很长时间让编译器接受它。它会给你输入错误,说你不能将一个东西分配给另一个
这些类型错误的存在是有原因的!如果你在类型系统中胡乱操作,很可能会出现问题。尝试将该匿名方法转换为TUploadThread上的普通方法,并以这种方式分配它,看看它是否工作得更好。不要对
OnNewCookie
事件使用匿名过程。使用普通方法类方法:
procedure TUploadThread.NewCookie(ASender: TObject; ACookie : TIdCookie; var VAccept : Boolean);
var
LCookie: TIdCookie;
begin
LCookie := TIdCookieClass(ACookie.ClassType).Create;
LCookie.Assign(ACookie);
OmniLock.Acquire;
try
GlobalCookieManager.CookieCollection.AddCookie(LCookie, TIdHTTP(TIdCookieManager(ASender).Owner).URL);
finally
OmniLock.Release;
end;
VAccept := True;
end;
或:
然后像这样使用它:
TUploadThread = class(TThread)
// ...
var
GlobalCookieManager : TIdCookieManager;
procedure TUploadThread.Upload(FileName : String);
var
IdHTTP : TIdHTTP;
TheSSL : TIdSSLIOHandlerSocketOpenSSL;
TheCompressor : TIdCompressorZLib;
TheCookieManager : TIdCookieManager;
AStream : TIdMultipartFormDataStream;
begin
ACookieManager := TIdCookieManager.Create(IdHTTP);
// Automatically sync cookies between local & global Cookie managers
@TheCookieManager.OnNewCookie := pPointer(Cardinal(pPointer( procedure(ASender : TObject; ACookie : TIdCookie; var VAccept : Boolean)
begin
OmniLock.Acquire;
try
GlobalCookieManager.CookieCollection.AddCookie(ACookie, TIdHTTP(TIdCookieManager(ASender).Owner).URL{IdHTTP.URL});
finally
OmniLock.Release;
end; // try/finally
VAccept := True;
end )^ ) + $0C)^;
// ======================================== //
IdHTTP := TIdHTTP.Create(nil);
with IdHTTP do
begin
HTTPOptions := [hoForceEncodeParams, hoNoParseMetaHTTPEquiv];
AllowCookies := True;
HandleRedirects := True;
ProtocolVersion := pv1_1;
IOHandler := TheSSL;
Compressor := TheCompressor;
CookieManager := TheCookieManager;
end; // with
OmniLock.Acquire;
try
// Load login info/cookies
TheCookieManager.CookieCollection.AddCookies(GlobalCookieManager.CookieCollection);
finally
OmniLock.Release;
end; // try/finally
AStream := TIdMultipartFormDataStream.Create;
with Stream.AddFile('file_name', FileName, 'application/octet-stream') do
begin
HeaderCharset := 'utf-8';
HeaderEncoding := '8';
end; // with
IdHTTP.Post('https://www.domain.com/post.php', AStream);
AStream.Free;
end;
procedure TUploadThread.Upload(FileName : String);
var
IdHTTP : TIdHTTP;
TheSSL : TIdSSLIOHandlerSocketOpenSSL;
TheCompressor : TIdCompressorZLib;
TheCookieManager : TIdCookieManager;
TheStream : TIdMultipartFormDataStream;
begin
IdHTTP := TIdHTTP.Create(nil);
try
...
TheCookieManager := TIdCookieManager.Create(IdHTTP);
TheCookieManager.OnNewCookie := NewCookie;
with IdHTTP do
begin
HTTPOptions := [hoForceEncodeParams, hoNoParseMetaHTTPEquiv];
AllowCookies := True;
HandleRedirects := True;
ProtocolVersion := pv1_1;
IOHandler := TheSSL;
Compressor := TheCompressor;
CookieManager := TheCookieManager;
end; // with
OmniLock.Acquire;
try
// Load login info/cookies
TheCookieManager.CookieCollection.AddCookies(GlobalCookieManager.CookieCollection);
finally
OmniLock.Release;
end;
TheStream := TIdMultipartFormDataStream.Create;
try
with TheStream.AddFile('file_name', FileName, 'application/octet-stream') do
begin
HeaderCharset := 'utf-8';
HeaderEncoding := '8';
end;
IdHTTP.Post('https://www.domain.com/post.php', TheStream);
finally
TheStream.Free;
end;
finally
IdHTTP.Free;
end;
end;
对评论作出答复:
谢谢你们,我改成了一种普通的方法,但我仍然在学习 AddCookies()中的异常,最后一个发生在读取 在此过程中,FRWLock.BeginWrite TIdCookies.LockCookieList(AAccessType:TIdCookieAccess): 潮汐学家 如果您的错误是读取地址00000000时发生的访问冲突,这有一个非常特殊的含义。这意味着您试图对为零的对象执行某些操作
当你得到它时,转到调试器。如果错误发生在你所说的那一行,那么几乎可以肯定,
Self
或FRWLock
此时是nil。检查这两个变量,找出哪一个还没有被构造,这将为你指明解决方案。你到底在用OnNewCookie赋值做什么?当我看到围绕匿名方法的多层指针强制转换,以类似end)^)+$0C)^的结尾
,我有点紧张。我同意这不是最好的代码,但正如我在代码中所写的,OnNewCookie可以保持本地和全局Cookie管理器同步(据我所知,问题不在于OnNewCookie事件),我同意@MasonWheeler。OnNewCookie
事件需要对象实例的非静态方法,而不是匿名过程TIdCookieManager
将向事件处理程序传递一个隐藏的Self
指针,但您的匿名参数没有考虑到这一点,因此其余的事件参数将被弄乱。谢谢大家,我已转换为普通方法,但在AddCookies()中仍会出现异常,最后一个发生在读取FRWLock.BeginWrite的行中此过程中的代码>TIdCookies.LockCookieList(AAccessType:TIdCookieAccess):TIdCookieList代码>在哪里实例化和释放GlobalCokieManager
对象?由于它在全球范围内使用,您应该在单元的初始化
和终结
块中执行此操作。谢谢Mason,请参阅Thank you Remy,但我仍然有相同的问题…请参阅AddCookie()
获得传递给它的cookie的所有权。因此,最终将有多个TIdCookieManager
对象引用相同的物理cookie对象。这会导致饼干被扔掉。我看到了两种可能的解决方案:使用OnNewCookie
调用AddCookie()
而不是直接调用ACookie
,或者调用AddServerCookie(ACookie.ServerCookie)
而不是AddCookie()
,最有可能的是globalcokiemanager
对象在使用之前没有被实例化。