本篇内容主要讲解“VB.NET实现 Smartphone进程启动的方法”，感兴趣的朋友不妨来看看。本文介绍的方法操作简单快捷，实用性强。下面就让小编来带大家学习“VB.NET实现 Smartphone进程启动的方法”吧!
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学习VB.NET Smartphone时，你可能会遇到VB.net实现Smartphone中进程启动问题，这里将介绍VB.NET Smartphone进程启动问题的解决方法，在这里拿出来和大家分享一下。开始时声明时老是将ShellExecuteEx 和CreateProcess这两个熟悉得不能再熟悉的Win32在VB 6中的声明直接粘到程序中，仅是将VB6的long改为NET的int32，结果老是报错。在网上查了N天资料，才发现原来Win CE的核心API都是在一个coredll.dll文件中，使得我差点没气死！
还有一点是SHELLEXECUTEINFO结构中的lpFile这种指向字符串常量的指针由于字符的编码问题不能象在Win32编程中简单声明为String类型，所在必须声明为Intptr，这样问题就出现了，使用 ShellExecuteEx函数必须使用微软在VB.net中不直接提供的指针操作，所以我只好根据网上的资料改写了一个VB.net对内存指针的封装类，详细VB.NET Smartphone代码及解释如下（新建一个模块，将以下代码粘贴进去即可使用）：
Imports System.Runtime.InteropServices '引及Net框架中对底层操作支持的命名空间 Public Class clsDAMSMobileMarshal '我写的内存管理类 #Region "与内存有关的API声明" REM 以下是与内存有关的移动设备API Public Declare Function LocalAlloc Lib "coredll.dll" Alias "LocalAlloc" (ByVal wFlags As Int32, _ ByVal wBytes As Int32) As IntPtr Public Declare Function LocalFree Lib "coredll.dll" Alias "LocalFree" (ByVal hMem As Int32) As Int32 Public Declare Function LocalLock Lib "coredll.dll" Alias "LocalLock" (ByVal hMem As Int32) As Int32 Public Declare Function LocalReAlloc Lib "coredll.dll" Alias "LocalReAlloc" (ByVal hMem As IntPtr, _ ByVal wBytes As Int32, ByVal wFlags As Int32) As IntPtr #End Region #Region "API常量声明" Public Const LMEM_FIXED = 0 Public Const LMEM_MOVEABLE = &H2 Public Const LMEM_ZEROINIT = &H40 Public Const LPTR = LMEM_FIXED Or LMEM_ZEROINIT #End Region Public Shared Function fnAllocHLocal(ByVal ni_i32Size As Int32) As IntPtr '申请本地内存，返回一个指向该内存块的指针 Return LocalAlloc(LPTR, ni_i32Size) End Function Public Shared Function fnFreeHLocal(ByRef ni_pLocal As IntPtr) As Int32 REM 释放指定的内存块柄 Dim ti32FunctionReturnValue As Int32 If ni_pLocal.Equals(IntPtr.Zero) = False Then ti32FunctionReturnValue = (LocalFree(ni_pLocal.ToInt32)) If ti32FunctionReturnValue = 0 Then ni_pLocal = IntPtr.Zero End If End If Return (ti32FunctionReturnValue) End Function Public Shared Function fnReAllocHLocal(ByVal ni_pIn As IntPtr, ByVal ni_i32Size As Int32) As IntPtr '对指定的内存块重新定义大小 Return LocalReAlloc(ni_pIn, ni_i32Size, LMEM_MOVEABLE) End Function Public Shared Function fnStringToHLocalUni(ByVal ni_strIn As String) As IntPtr '将指定的字符串复制到一个内存块中，并返回该内存块的指针，这个指针必须使用fnFreeHLocal函数释放 Dim ti32StringBufLength As Int32 Dim tpTempA As IntPtr If Not (ni_strIn Is Nothing) Then If ni_strIn.Length = 0 Then Return IntPtr.Zero Else ti32StringBufLength = (ni_strIn.Length + 1) * 2 ' 包括***一个中止字符 tpTempA = fnAllocHLocal(ti32StringBufLength) If tpTempA.Equals(IntPtr.Zero) = False Then '申请内存成功 Marshal.Copy(ni_strIn.ToCharArray, 0, tpTempA, ni_strIn.Length) Return tpTempA End If End If End If End Function End Class 有了这个辅助函数，以下的API调用就简单了，只需正确声明即可，以下是ShellExecuteEx及CreateProcess涵数及其结构的正确声明(同样是将代码粘贴到一个新建模块中即可调用)： imports System.Runtime.InteropServices REM API常数声明------------------------- Public Const SW_SHOWNORMAL = 1 Public Const gcNORMAL_PRIORITY_CLASS = &H20 Public Const gcINFINITE = &HFFFF Public Const WAIT_TIMEOUT = &H102& #Region "Structure SHELLEXECUTEINFO" _ Structure SHELLEXECUTEINFO Public cbSize As Int32 Public fMask As Int32 Public hwnd As IntPtr Public lpVerb As IntPtr 'LPCTSTR，这种类型不能声明为string，只可以老老实实声明为Intptr Public lpFile As IntPtr 'LPCTSTR，这种类型不能声明为string，只可以老老实实声明为Intptr Public lpParameters As IntPtr 'LPCTSTR，这种类型不能声明为string，只可以老老实实声明为Intptr Public lpDirectory As IntPtr 'LPCTSTR，这种类型不能声明为string，只可以老老实实声明为Intptr Public nShow As Int32 Public hInstApp As IntPtr 'Optional members Public lpIDList As IntPtr 'LPVOID Public lpClass As IntPtr 'LPCTSTR Public hkeyClass As Int32 Public dwHotKey As Int32 Public hIcon As Int32 Public hProcess As IntPtr Public Sub Dispose() '在调用后释放结构中的内存块 clsDAMSMobileMarshal.fnFreeHLocal(Me.lpVerb) clsDAMSMobileMarshal.fnFreeHLocal(Me.lpFile) clsDAMSMobileMarshal.fnFreeHLocal(Me.lpParameters) clsDAMSMobileMarshal.fnFreeHLocal(Me.lpDirectory) End Sub End Structure #End Region #Region "Structure STARTUPINFO" _ Public Structure STARTUPINFO Public cb As Int32 Public lpReserved As IntPtr Public lpDesktop As IntPtr Public lpTitle As IntPtr Public dwX As Int32 Public dwY As Int32 Public dwXSize As Int32 Public dwYSize As Int32 Public dwXCountChars As Int32 Public dwYCountChars As Int32 Public dwFillAttribute As Int32 Public dwFlags As Int32 Public wShowWindow As Int16 Public cbReserved2 As Int16 Public lpReserved2 As Int32 Public hStdInput As Int32 Public hStdOutput As Int32 Public hStdError As Int32 End Structure #End Region #Region "Structure PROCESS_INFORMATION" _ Public Structure PROCESS_INFORMATION Public hProcess As IntPtr Public hThread As IntPtr Public dwProcessId As Int32 Public dwThreadId As Int32 End Structure #End Region REM api函数声明 #Region "Function CreateProcess" public Overloads Declare Function CreateProcess Lib "coredll.dll" (ByVal imageName As String, _ ByVal cmdLine As String, _ ByVal lpProcessAttributes As IntPtr, _ ByVal lpThreadAttributes As IntPtr, _ ByVal boolInheritHandles As Int32, _ ByVal dwCreationFlags As Int32, _ ByVal lpEnvironment As IntPtr, _ ByVal lpszCurrentDir As IntPtr, _ ByRef si As STARTUPINFO, _ ByRef pi As PROCESS_INFORMATION _ ) As Integer #End Region #Region "Function CloseHandle" Public Declare Function CloseHandle Lib "CoreDll.dll" (ByVal Handle As IntPtr) As Int32 #End Region #Region "Function WaitForSingleObjectEx" Public Declare Function WaitForSingleObjectEx Lib "coredll.dll" (ByVal hHandle As IntPtr, _ ByVal dwMilliseconds As Int32, _ ByVal bAlertable As Int32 _ ) As Int32 #End Region #Region "Function ShellExecuteEx" Public Declare Function ShellExecuteEx Lib "coredll
到此，相信大家对“VB.NET实现 Smartphone进程启动的方法”有了更深的了解，不妨来实际操作一番吧！这里是创新互联网站，更多相关内容可以进入相关频道进行查询，关注我们，继续学习！
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