Xmllite torrent

You can declare that an element is of a certain type, but you cannot retrieve that element as that specified data type.

All values are returned as strings, and it is up to the application to convert to types other than string. In the example above, nameOfElement and attrName have this limit. In the example above, attrValue has this limit. To read values with chunking, you use the ReadValueChunk method. If any of these limits are exceeded, then XmlLite returns an error. The internal subset can be accessed by using GetValue, and the subset will be returned as a string.

The Xml declaration is also handled in a special way. The node has no value and has "xml" as the local name. It has no namespace and has up to three attributes: version, standalone, and encoding. For more information, see Section 2. These errors are recoverable and further processing can continue. An example of an argument error is passing an incorrect or illegal value for an argument. These errors are not recoverable, but the same instance of the reader can be used by resetting the input source.

The resulting COM-style interfaces use the familiar IUnknown interface methods for lifetime management. You do, however, need to concern yourself with thread safety, as XmlLite is not thread-safe for the sake of performance in single-threaded scenarios. Although optional, the CComPtr class template ensures that the interface pointer is released promptly.

This is a common pattern in COM programming, allowing the caller to specify the type of interface pointer to return. In this case, it is used to retrieve the IID for the interface.

The final argument to CreateXmlReader accepts an optional IMalloc implementation to allow the caller to control memory allocations. Once you have created the reader, you need to indicate the storage that the reader will use as input.

The IStream interface represents storage, letting you use XmlLite with any stream implementation you might devise:. Once you have set the input for the XML reader, you can read with repeated calls to the Read method.

The Read method accepts an optional argument that returns the node type on each successful call. Here's an example of how you can enumerate through the nodes:. The following example illustrates how you can enumerate through the attributes for a given node:.

When you call the IXmlReader's Read method, it automatically stores any node attributes in an internal collection. This allows you to move the reader to a specific attribute by name using the MoveToAttributeByName method. However, it is usually more efficient to enumerate the attributes and store them in an application-specific data structure. Note that you can also determine the number of attributes in the current node using the GetAttributeCount method. Once you have settled on a node or attribute, getting its information is straightforward.

This example demonstrates how you can get the namespace URI and local name for a given node:. All of the IXmlReader methods that return string values follow this pattern. The first argument accepts a pointer to a wide-character pointer constant. The second argument is optional and if it's not zero, it will return the length of the string measured in characters excluding the null terminator.

Here is another example of the emphasis on performance. The string pointers returned from IXmlReader methods are only valid until you move the reader to another node or invalidate the current node in some other way, such as by setting a new input stream or releasing the IXmlReader interface. In other words, the IXmlReader is not returning a copy of the string to the caller.

Unlike its counterpart in the. If a particular element or attribute contains a number or date, for example, you need to first get its string representation and then convert it yourself as necessary. Many of the other helper methods present in the XmlReader class of the. Keep in mind, though, that IStream could abstract any storage, and the file shown here is just a common example. Once you have created the writer, you need to indicate the storage that the writer will use as output:.

Before beginning to write, you can modify the writer properties. The XmlWriterProperty enum defines the properties that are available. You might, for example, want to specify whether the XML output is indented for human readability, as can be done with the SetProperty method:. You can then start writing to the underlying stream using IXmlWriter methods. XmlLite supports XML fragments.

The declaration is dependent on the encoding in use but the default is UTF-8, which should be suitable in most cases. MD5: 7d74cd2f14e5e4ac1adfba SHA fefc2be1af8fbbd6df17b8b MD5: e0e2b8b8ade09fd50a3. SHA bece4fabbbafe1d MD5: a87ffac1f0ff6a1dbccf SHA 27ed5f14cdeebc9c11abcc. MD5: b74bcd61ecce7. SHA bd4c04d9badfded7aee. MD5: e09eaa13c24ce7c0. SHA 4d7bc0a24f5eeb5d5cb9ebeafb2. MD5: feef1dbcf97a SHA ddef0eff0cbde29c5d.

MD5: 15ea8fcb44a0bd6. Because it is such a flexible format, XML can be used in a vast variety of scenarios. Some scenarios work with XML documents that come from external sources, and it is not known whether the XML documents are valid.

In these scenarios, verification of validity is important. Performance may be a concern, but the overriding concern is that the application reading the XML receives a valid document. Saving and loading documents from and to a variety of applications is a usage scenario that falls in this category. Some software systems use XML as a data store or a means for communication.

In these scenarios, the developer knows that the XML document is valid, perhaps because another part of the system which is under the control of the same developer or organization generated the XML. The question of document validity is not an overriding concern. One example of this approach is where the software system runs on a server farm, and XML is used to communicate between various servers and processes.

Another example might be one where a relatively complicated application has to store and retrieve a large amount of information.