我要评论例子1如下:
//声明部分
[dllimport("um_web_client.dll")]
private static extern int checkusername(string username);
//
public static int authusername(string username)
{
if(!isconnection())
{
startwebclient(udbclientip,udbclientport,udbclienttimeout);
}
return checkusername(username);
}
但是如果c++方法中用了指针或者结构体等则引用就要注意,相应就要用到引用数组或者指针,例子2:
声明部分
[structlayout(layoutkind.sequential, charset=charset.ansi )]
public class tagplayerinfoout
{
public int id;
public string playername;
public int country;
public int officerrace;
public int level;
public int militaryrank;
public int money;
public int resourcecount;
public int citycount;
public int generalcount;
public int credit;
}
[ structlayout( layoutkind.sequential )]
public struct tagplayerinfooutex
{
public int id;
public intptr playername;
public int country;
public int officerrace;
public int level;
public int militaryrank;
public int money;
public int resourcecount;
public int citycount;
public int generalcount;
public int credit;
}
[dllimport("um_web_client.dll")]
public static extern int getplayerlistcs(int maxrows, out int rows, out intptr playerlist);
[dllimport("um_web_client.dll")]
public static extern int getplayerlistcs(int maxrows, out int rows, tagplayerinfooutex** playerlist);
方法
public static datatable usingmarshal()
{
if(!isconnection())
{
startwebclient(udbclientip,udbclientport,udbclienttimeout);
}
datatable dt = new datatable();
dt.columns.add("id");
dt.columns.add("playername");
dt.columns.add("country");
dt.columns.add("officerrace");
dt.columns.add("level");
dt.columns.add("militaryrank");
dt.columns.add("money");
dt.columns.add("resourcecount");
dt.columns.add("citycount");
dt.columns.add("generalcount");
dt.columns.add("credit");
int size = 0;
intptr outarray;
getplayerlistcs(20, out size, out outarray);
tagplayerinfoout[] manarray = new tagplayerinfoout[size];
intptr current = outarray;
//console.writeline("记录数{0}",size);
for( int i = 0; i < size; i++ )
{
manarray[ i ] = new tagplayerinfoout();
marshal.ptrtostructure(current, manarray[i]);
marshal.destroystructure(current, typeof(tagplayerinfoout) );
current = (intptr)((long)current + marshal.sizeof(manarray[i]));
dt.rows.add(new object[] {manarray[i].id,manarray[i].playername,manarray[i].country,manarray[i].officerrace,manarray[i].level,manarray[i].militaryrank,manarray[i].money,manarray[i].resourcecount,manarray[i].citycount,manarray[i].generalcount,manarray[i].credit});
dt.acceptchanges();
//console.writeline( "element {0}: {1} {2}", i, manarray[i].id, manarray[i].playername);
}
marshal.freecotaskmem(outarray);
return dt;
}
public static unsafe datatable usingunsafe()
{
int size;
if(!isconnection())
{
startwebclient(udbclientip,udbclientport,udbclienttimeout);
}
datatable dt = new datatable();
dt.columns.add("id");
dt.columns.add("playername");
dt.columns.add("country");
dt.columns.add("officerrace");
dt.columns.add("level");
dt.columns.add("militaryrank");
dt.columns.add("money");
dt.columns.add("resourcecount");
dt.columns.add("citycount");
dt.columns.add("generalcount");
dt.columns.add("credit");
tagplayerinfooutex* presult;
getplayerlistcs(20, out size, &presult );
tagplayerinfooutex* pcurrent = presult;
//console.writeline("记录数{0}",size);
for( int i = 0; i < size; i++, pcurrent++ )
{
//console.writeline( "element {0}: {1} {2}", i, pcurrent->id ,marshal.ptrtostringansi(pcurrent->playername));
//marshal.freecotaskmem(pcurrent->playername );
dt.rows.add(new object[] {pcurrent->id,pcurrent->playername,pcurrent->country,pcurrent->officerrace,pcurrent->level,pcurrent->militaryrank,pcurrent->money,pcurrent->resourcecount,pcurrent->citycount,pcurrent->generalcount,pcurrent->credit});
dt.acceptchanges();
}
marshal.freecotaskmem((intptr)presult );
return dt;
}
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