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How to develop the registry under .NET Compact Framework? for this problem, this article introduces the corresponding analysis and solution in detail, hoping to help more partners who want to solve this problem to find a more simple and easy way.

Brief introduction

This paper introduces the basic concept of registry development under CF.net, introduces the tools to operate registry under Windows Mobile and Wince, and implements a registry export tool with C #.

Background

Like the Windows desktop system, Wince stores system information, driver information, application information and other important information in the registry. Recently, it is necessary to realize the automatic registration of 3G equipment and the automatic creation of 3G link items. In the process of realizing this function, it is found that the device registration information and link key information are saved in the registry, so it is necessary to implement the function of exporting the registry to compare the registry information before and after registration.

What is the registry?

The Registry is actually a hierarchical file database that stores operating system information, driver information, application information, user information, and so on. There are two key entries in the registry, Key and Value, here I keep English, because the translation into Chinese is key (key) and Value (value) is easy to confuse. A Key is an item that can contain SubKey and Value. Can be understood as a container node, SubKey and Key are essentially the same, SubKey can continue to contain SubKey and Value. Value is an item that contains data types and data values. It can also be understood as a leaf node. Value cannot contain other SubKey and Value.

Registry development scheme

To view and modify the registry, the following two tools are recommended:

Windows CE Remote Registry Editor, which can be found under the menus of VS 2005 and VS 2008. It is very convenient to view and modify the registry remotely. However, the tool does not support import and export.

PHM Registry Editor

The tool can be installed on the device and view and modify the registry directly on the device. PHM Registry Editor also supports import and export, but import and export is in a proprietary format and is not compatible with MS.

The reality of registry development

Due to the limitations of the above two tools, I implemented a registry export function, which is compatible with the file format of the desktop version of the Registry Editor export function.

The manipulation registry class was introduced in CF.net 2.0, which is not supported by CF.net 1.0. To use the registry function, you need to reference Microsoft.Win32 namespace.

Using Microsoft.Win32

Here is the export interface, which exports the root key to StringBuilder.

Public StringBuilder Export () {StringBuilder sb = new StringBuilder (); Export (sb, Registry.ClassesRoot); Export (sb, Registry.CurrentUser); Export (sb, Registry.LocalMachine); Export (sb, Registry.Users); return sb;}

In Windows Mobile and Wince systems, there are fewer entries in the registry than in desktop systems, as can be seen in the figure above.

The following code exports a specific key.

Public void Export (StringBuilder sb, RegistryKey key) {/ / log down itself. Sb.AppendFormat (CultureInfo.CurrentCulture, "\ r\ n [{0}]\ r\ n", key.Name); / / log down values string [] s = key.GetValueNames (); Array.Sort (s); / / log down "Default" first try {key.GetValue (Default); ExportValue (sb, key, Default) } catch {} foreach (string name in s) {if (! name.Equals (Default)) {ExportValue (sb, key, name);}} / / log down subkeys s = key.GetSubKeyNames (); Array.Sort (s); foreach (string subKeyName in s) {Export (sb, key.OpenSubKey (subKeyName)) }}

To export Key, you first export yourself, then export Value, and when you export Value, you first export Default Value if you have Default Value, and then export other Value. Export Value and then recursively export SubKeys.

The following code is the export Value.

Private void ExportValue (StringBuilder sb, RegistryKey key, string name) {switch (key.GetValueKind (name)) {case RegistryValueKind.DWord: int dword = (int) key.GetValue (name) If (name.Equals (Default)) {sb.AppendFormat (CultureInfo.CurrentCulture, "@ = dword: {0:X8}\ r\ n", dword) } else {sb.AppendFormat (CultureInfo.CurrentCulture, "\" {0}\ "= dword: {1:X8}\ r\ n", name, dword);} break Case RegistryValueKind.String: if (name.Equals (Default)) {sb.AppendFormat (CultureInfo.CurrentCulture, "@ =\" {0}\ "\ r\ n", key.GetValue (name)) } else {sb.AppendFormat (CultureInfo.CurrentCulture, "\" {0}\ "=\" {1}\ "\ r\ n", name, key.GetValue (name));} break Case RegistryValueKind.MultiString: string [] values = (string []) key.GetValue (name); if (name.Equals (Default)) {sb.Append ("@ = multi_sz:") } else {sb.AppendFormat (CultureInfo.CurrentCulture, "\" {0}\ "= multi_sz:", name);} for (int I = 0; I < values.Length) Sb.AppendFormat +) {if (I! = 0) {sb.Append (",");} sb.AppendFormat (CultureInfo.CurrentCulture, "\" {0}\ ", values [I]) } sb.Append ("\ r\ n"); break; case RegistryValueKind.Binary: byte [] bytes = (byte []) key.GetValue (name) If (name.Equals (Default)) {sb.Append ("@ = hex:");} else {sb.AppendFormat (CultureInfo.CurrentCulture, "\" {0}\ "= hex:", name) } int j = 0; for (int I = 0; I < bytes.Length; iTunes +) {/ / Display each byte as two hexadecimal digits. If (I = = (bytes.Length-1)) {sb.AppendFormat (CultureInfo.CurrentCulture, "{0:X2}", bytes [I]) } else {sb.AppendFormat (CultureInfo.CurrentCulture, "{0:X2},", bytes [I]);} + + j If (j = = 25) {j = 0; sb.Append ("\\ r\ n");}} sb.Append ("\ r\ n") Break;}}

Because Value has different data types, different formats are exported according to the data type. The key.GetValueKind () function fetches the Key data type RegistryValueKind.

Here is how it works.

Environment: Visual Studio 2008 + Windows Mobile 6 professional SDK + .NET Compact Framework 2.0

This is the answer to the question about how to develop the registry under .NET Compact Framework. I hope the above content can be of some help to you. If you still have a lot of doubts to be solved, you can follow the industry information channel for more related knowledge.

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