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转摘自:http://blog.csdn.net/lusonglin3g/article/details/5053629 今天还是继续说说C#调用系统Api启动外部程序的方法,今天要说的是CreateProcess这个Api函数,相比前两篇文章(一、二)中所说的Api,CreateProcess参数要更复杂一些,但使用起来,要更灵活。 using System.Runtime.InteropServices;
2. CreateProcess中用到了几个结构体类型,先声明他们: [System.Runtime.InteropServices.StructLayout(LayoutKind.Sequential)] public class SECURITY_ATTRIBUTES { public int nLength; public string lpSecurityDescriptor; public bool bInheritHandle; } [StructLayout(LayoutKind.Sequential)] public struct STARTUPINFO { public int cb; public string lpReserved; public string lpDesktop; public int lpTitle; public int dwX; public int dwY; public int dwXSize; public int dwYSize; public int dwXCountChars; public int dwYCountChars; public int dwFillAttribute; public int dwFlags; public int wShowWindow; public int cbReserved2; public byte lpReserved2; public IntPtr hStdInput; public IntPtr hStdOutput; public IntPtr hStdError; } [StructLayout(LayoutKind.Sequential)] public struct PROCESS_INFORMATION { public IntPtr hProcess; public IntPtr hThread; public int dwProcessId; public int dwThreadId; } 3. 声明CreateProcess [DllImport("Kernel32.dll", CharSet = CharSet.Ansi)] public static extern bool CreateProcess( StringBuilder lpApplicationName, StringBuilder lpCommandLine, SECURITY_ATTRIBUTES lpProcessAttributes, SECURITY_ATTRIBUTES lpThreadAttributes, bool bInheritHandles, int dwCreationFlags, StringBuilder lpEnvironment, StringBuilder lpCurrentDirectory, ref STARTUPINFO lpStartupInfo, ref PROCESS_INFORMATION lpProcessInformation ); 4. 下边这三个也是Api,作用看注释 #region Win32 Api : WaitForSingleObject //检测一个系统核心对象(线程,事件,信号)的信号状态,当对象执行时间超过dwMilliseconds就返回,否则就一直等待对象返回信号 [DllImport("Kernel32.dll")] public static extern uint WaitForSingleObject(System.IntPtr hHandle, uint dwMilliseconds); #endregion #region Win32 Api : CloseHandle //关闭一个内核对象,释放对象占有的系统资源。其中包括文件、文件映射、进程、线程、安全和同步对象等 [DllImport("Kernel32.dll")] public static extern bool CloseHandle(System.IntPtr hObject); #endregion #region Win32 Api : GetExitCodeProcess //获取一个已中断进程的退出代码,非零表示成功,零表示失败。 //参数hProcess,想获取退出代码的一个进程的句柄,参数lpExitCode,用于装载进程退出代码的一个长整数变量。 [DllImport("Kernel32.dll")] static extern bool GetExitCodeProcess(System.IntPtr hProcess, ref uint lpExitCode); #endregion 5. 如果示例中argm指定的程序执行时间很长,进程会被阻塞到WaitForSingleObject行处,直到命令执行完毕或进程被中止才继续执行后边的语句。 string argm = "cmd.exe"; STARTUPINFO sInfo = new STARTUPINFO(); PROCESS_INFORMATION pInfo = new PROCESS_INFORMATION(); if (!CreateProcess(null, new StringBuilder(argm), null, null, false, 0, null, null, ref sInfo, ref pInfo)) { throw new Exception("调用失败"); } uint i = 0; WaitForSingleObject(pInfo.hProcess, int.MaxValue); GetExitCodeProcess(pInfo.hProcess, ref i); CloseHandle(pInfo.hProcess); CloseHandle(pInfo.hThread);
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