dll调用

Question

调用方法基本正确,WINDOWS中有很多怪问题出现null Exception的.用 try{
...
}catch(Exception){}
容错就好.

Answer 1

对了,静态的API调是static 的.

Answer 2

我使用new 是开辟数组空间，函数原型如下
BOOL EnumServicesStatus(
  SC_HANDLE hSCManager,
  DWORD dwServiceType,
  DWORD dwServiceState,
  LPENUM_SERVICE_STATUS lpServices,
  DWORD cbBufSize,
  LPDWORD pcbBytesNeeded,
  LPDWORD lpServicesReturned,
  LPDWORD lpResumeHandle
);

Answer 3

ess=new EnumServiceStatus[100];   --》ess=EnumServiceStatus[100];  试试

Answer 4

yaoyaonet(绿洲)
编译都不通过：（
还有这个函数是用来枚举windows2000的服务，
我试了，如果调用函数时出错，将不能完全枚举服务

Answer 5

在C＃中使用API首先要使用引入名字空间：
using System.Runtime.InteropServices;然后
[DllImport("AdvAPI32")]
＋函数说明

Answer 6

using System.Runtime.InteropServices;名称空间已经引用
编译都通过了，是在运行时出现的错误提示，用try...catch...finally
捕捉异常，将不能得到一个我所需要的东西.

Answer 7

函数原型:
BOOL EnumServicesStatus(
  SC_HANDLE hSCManager,
  DWORD dwServiceType,
  DWORD dwServiceState,
  LPENUM_SERVICE_STATUS lpServices,
  DWORD cbBufSize,
  LPDWORD pcbBytesNeeded,
  LPDWORD lpServicesReturned,
  LPDWORD lpResumeHandle
);
C#结构
[StructLayout(LayoutKind.Sequential,CharSet=CharSet.Auto)]
public struct ServiceStatus
{
public ServiceType Type;
public ServiceCurrentType CurrentType;
public SerivceControlAccepted ControlAccepted;
public int Win32ExitCode;
public int ServiceSpecificExitCode;
public int CheckPoint;
public int WaitHint;
}
[StructLayout(LayoutKind.Sequential,CharSet=CharSet.Auto)]
public struct EnumServiceStatus
{
[MarshalAs(UnmanagedType.LPTStr)]
public String ServiceName;
[MarshalAs(UnmanagedType.LPTStr)]
public String DisplayName;
public ServiceStatus status;
}
使用的枚举类型
public enum ServiceCurrentType
{
Stopped =0x00000001,
StartPending =0x00000002,
StopPending =0x00000003,
Running =0x00000004,
ContinuePending =0x00000005,
PausePending =0x00000006,
Paused =0x00000007
}
public enum ServiceType
{
KernelDriver =0x00000001,
FileSystemDriver =0x00000002,
Adapter =0x00000004,
RecognizerDriver =0x00000008,
ServiceDriver =(KernelDriver|FileSystemDriver|RecognizerDriver),
Win32_OwnProcess =0x00000010,
Win32_ShareProcess =0x00000020,
ServiceWin32 =(Win32_OwnProcess|Win32_ShareProcess),
InterActiveProcess =0x00000100,
TypeAll =(Adapter|ServiceDriver|ServiceWin32|InterActiveProcess)
}
public enum SerivceControlAccepted
{
Stop =0x00000001,
PauseContinue =0x00000002,
Shutdown =0x00000004,
ParamChange =0x00000008,
NetBindChange =0x00000010,
HardwareProfileChange =0x00000020,
PowerEvent =0x00000040,
SessionChange =0x00000080
}
public enum ServiceActiveStatus
{
Active =0x00000001,
InActive =0x00000002,
StateAll =(Active|InActive)
}
详细的API说明在
ms-help://MS.MSDNQTR.2003FEB.2052/dllproc/base/enumservicesstatus.htm中