. NET Compact framework BASICS (1)

I always wanted to sort out the usage and unmanaged methods of all managed classes under all. NET Compact framework.

Write thisArticlePurpose: To help developers who want to get started and use some functions as a reference document. When writing these articles, I may be constantly learning and not very familiar with a lot of knowledge. When reading these articles, you can tell me your own needs and ideas, I will continue to expand and improve it.

The article begins with the Managed class.

Development Environment: vs2008, platform: wm6.0 professional

This article describes three namespaces:
1. Microsoft. windowsmobile. Status (Microsoft. windowsmobile. Status. dll)
2. Microsoft. windowsmobile. telephony (Microsoft. windowsmobile. telephony. dll)
3. Microsoft. Win32 (mscorlib. dll)

1. Microsoft. windowsmobile. Status has two main classes
Systemstate: used to collect and monitor many status information of the system, including calendar, email, phone, synchronization, power supply, etc.
Registrystate: used to monitor a key value in the registry.
In addition, the namespace also contains six enumerations.
Activesyncstatus: synchronization status of the device (Synchronization in progress, no synchronization, synchronization error)
Batterylevel: battery level (veryhigh (80%-100%), high (60%-80%), nomail (20%-60%), low (10%-20% ), verylow (0%-10% ))
Batterystate: Battery status (critical, low, nomail)
Lockstates: devicelock, keylock, none, simlock)
Systemproperty: All information used for monitoring in systemstate.

Demo1:
Monitor battery information: triggered when the battery level changes.

Figure 1: The initial interface after the demo is run. When you click "Current status", the current battery level is displayed.

Figure 2: how to change the battery grade.

Figure 3: immediate trigger event, which is defined as displaying the new battery level.

MainCode:

1 Private   Void Statusform_load ( Object Sender, eventargs E)
2 {
3 Status =   New Systemstate (systemproperty. powerbatterystrength );
4 Status. Changed + = New Changeeventhandler (status_changed );
5
6 Regstatus =   New Registrystate ( @" HKEY_CURRENT_USER \ My User Key " , " My key value " );
7 Regstatus. Changed + =   New Changeeventhandler (regstatus_changed );
8 }

Status is the system status object. It is initialized in form_load and its change event is registered. Once changed, it is triggered.

1 This . Listbox1.items. Add ( " Current value: "   + (Batterylevel) systemstate. getvalue (systemproperty. powerbatterystrength). tostring ());

Obtain battery information in the current status event. Use getvalue.

1 Private   Void Status_changed ( Object Sender, changeeventargs Arg)
2 {
3This. Listbox1.items. Add ("New value:" +(Batterylevel) Arg. newvalue). tostring ());
4}

A registration event is triggered when a change occurs.

Demo2: monitor registry changes
In the mobile device registry, there are four categories: classesroot, localmachine, currentuser, and users.
In Demo, the monitored key value is my key value under HKEY_CURRENT_USER \ My User Key.

Click "Change Registry" in Figure 3 to modify the key value. Figure 4 shows the monitoring effect.

Code:

1 Private   Void Statusform_load ( Object Sender, eventargs E)
2 {
3 Status =   New Systemstate (systemproperty. powerbatterystrength );
4 Status. Changed + = New Changeeventhandler (status_changed );
5
6 Regstatus =   New Registrystate ( @" HKEY_CURRENT_USER \ My User Key " , " My key value " );
7 Regstatus. Changed + =   New Changeeventhandler (regstatus_changed );
8 }

Register a monitoring event

1 Private   Void Regstatus_changed ( Object Sender, changeeventargs ARGs)
2 {
3This. Listbox1.items. Add ("Registry new value:" +Args. newvalue );
4}

Trigger event processing

2. Microsoft. windowsmobile. telephony only has the phone class.
This class provides a direct pop-up call interface. This class provides the talk method. This method is used to dial a phone number (string type.

Code:

1 Private   Void Menuitem5_click ( Object Sender, eventargs E)
2 {< br> 3 phone = New phone ();
4 phone. talk ( " 7272024 " , true );
5 }

Call 7272024. The second parameter indicates whether a prompt is displayed.

Figure 5 effect: If yes is selected, the dialing page is displayed. This interface is not displayed if this parameter can be left blank.

3. Microsoft. Win32
Provides two classes: Registry and registrykey.
Provides four enumeration types: registryhive, registrykeypermissioncheck, registryvaluekind, and registryvalueoptions.
This class is used in the same way as that in the complete framework.

Code in this demo:

1 Registrykey key = Registry. currentuser;
2 Registrykey regmykey = Key. opensubkey (sub_key, True );
3 If (Regmykey ! =   Null )
4 {
5 If (Regmykey. getvalue (sub_key_name). tostring () =   " 1 " )
6 Regmykey. setvalue (sub_key_name, " 0 " , Registryvaluekind. String );
7 Else
8 Regmykey. setvalue (sub_key_name, " 1 " );
9 }
10 Else
11 {< br> 12 key = key. createsubkey (sub_key);
13 key. setvalue (sub_key_name, " 1 " , registryvaluekind. string);
14 }

Note: The second parameter of the opensubkey method. If this parameter is not set, the default value is false, and the opened key is read-only. You cannot call setvalue to modify the key value.

Summary:
After all,. Net CF provides limited hosting code. After reading this article, all beginners hope to help.

Download Code: deviceapidemo.rar (152.64 KB)