Step by step teach you how to implement a simple cloud service

Preparations:

Windows azure can only run on Windows 7, Windows Server 2008, and Windows Vista. Windows 2003 and XP are currently not supported. I installed Windows 7 yesterday and tried to write a small azureProgramThe program is very simple and implements the simple upload and search functions of images. I will study Microsoft's azure platform by the way. below is my software environment.

Operating System: Windows 7

Development tools:Visual studio2010 RC, Windows azure SDK, Windows azure tools

Step 1: Install the Windows azure SDK

First, make sure that your operating system meets the requirements,Visual Studio can beVisual Studio2008 orVisual Studio2010. Download the Windows azure SDK at the following URL:

Http://www.microsoft.com/downloads/details.aspx? Familyid = 7729904158926-4db0-958f-95c1da572c84 & displaylang = en

Once you have successfully installed Windows azure SDK V1.1 on your computer, for example:

Start DevelopmentFabric and Development Stroage:

The configuration page is displayed:

Development fabric:

DevelopmentStorage:

The above proves that the installation is successful.

Step 2: Install Windows azure tools for Microsoft Visual Studio

Http://www.microsoft.com/downloads/details.aspx? Familyid = 5664019e-6860-4c33-9843-4eb40b297ab6 & displaylang = en

After installation,Visual Studio hasThe template is as follows:

Step 3: Create a cloud serviceName it blobstorage, for example:

Use simple ASP. NET web role and rename it blobwebrole, for example:

Project with the following structure:

Step 4: ModifyCode, We implement a simple image upload and search function:

1. Add a connectionstring, as shown in figure

2. Modify the webrole Code as follows:

Code

  Public   Class Webrole: roleentrypoint
{
Public   Override   Bool Onstart ()
{
Diagnosticmonitor. Start ( " Blobconnectionstring " );

cloudstorageaccount. setconfigurationsettingpublisher (configname, configsetter) =>
{< br> configsetter (roleenvironment. getconfigurationsettingvalue (configname);
});

// get the Blob connection string
cloudstorageaccount objstorage = cloudstorageaccount. fromconfigurationsetting ( " blobconnectionstring " );

// get the Client Reference
cloudblobclient objclient = New cloudblobclient (objstorage. blobendpoint, objstorage. credentials);

// get the reference to container
cloudblobcontainer objcontainer = objclient. getcontainerreference ( " mycontainer " );

//Create the container if it does not exist
Objcontainer. createifnotexist ();

Roleenvironment. Changing+ =Roleenvironmentchanging;

Return Base. Onstart ();

}

Private   Void Roleenvironmentchanging ( Object Sender, roleenvironmentchangingeventargs E)
{
// If a configuration setting is changing
If (E. Changes. Any (Change => Change Is Roleenvironmentconfigurationsettingchange ))
{
// Set E. Cancel to true to restart this role instance
E. Cancel =   True ;
}
}
}

3. Drag and Drop several controls on the page to make a simple layout as follows:

4. The background code is as follows:

Code

Protected   Void Button#click ( Object Sender, eventargs E)
{

// Get the storage account reference
Cloudstorageaccount objstorage = Cloudstorageaccount. fromconfigurationsetting ( " Blobconnectionstring " );
// Get the Client Reference using storage blobend point
Cloudblobclient objclient =   New Cloudblobclient (objstorage. blobendpoint, objstorage. Credentials );
// Get container reference
Cloudblobcontainer objcontainer = Objclient. getcontainerreference ( " Mycontainer " );

// Get blob reference
Cloudblob OBJ = Objcontainer. getblobreference (fileupload1.filename. tostring ());

// Set meta values
OBJ. Metadata [ " Metaname " ] =   " Meta " ;
// Open a stream using the cloud object
Blobstream = OBJ. openwrite ();
// Write the stream to the Blob Database
Blobstream. Write (fileupload1.filebytes, 0 , Fileupload1.filebytes. Count ());
Blobstream. Close ();

// Browse through blob list from the container
Ienumerable < Ilistblobitem > Objbloblist = Objcontainer. listblobs ();
Foreach (Ilistblobitem objitem In Objbloblist)
{
Response. Write (objitem. Uri +   " <Br> " );
}

}

Protected   Void Button2_click ( Object Sender, eventargs E)
{
// Get the storage account reference
Cloudstorageaccount objstorage = Cloudstorageaccount. fromconfigurationsetting ( " Blobconnectionstring " );
// Get the Client Reference using storage blobend point
Cloudblobclient objclient =   New Cloudblobclient (objstorage. blobendpoint, objstorage. Credentials );
// Get container reference
Cloudblobcontainer objcontainer = Objclient. getcontainerreference ( " Mycontainer " );
// Get the Blob reference using the Blob name provided in the search
Cloudblob OBJ = Objcontainer. getblobreference (txtsearch. Text );
Blobstream = OBJ. openread ();
// Create the image object and display the same on the browser response
System. Drawing. Image objimg =   Null ;
Objimg = System. Drawing. image. fromstream (blobstream, True );
Response. Clear ();
Response. contenttype =   " Image/GIF " ;
Objimg. Save (response. outputstream, system. Drawing. imaging. imageformat. JPEG );
}

Running effect:

Upload:

Search: search for a beauty Image

Code:/files/zhuqil/blobstorage.zip