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This should be pretty easy but I'm having so many problems with it.
I'm following someone elses code and cant figure out how he did this.
One of the webmethods returns 3 parameters and it uses a class of somesort to do it. We had to reverse engineer to get the code so its not complete.
[WebMethod]
Public Class1 HelloWorld(int i1, string str1, string str2)
{
try
}
//Code
}
Catch
}
return Class1(1,2,3)
}
{
return Class1(0,0,0)
}
}
How is this possible? Thanks in advance.
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why would it not be possible ? Importing a web service will import the types it exposes, including enums and classes.
Christian Graus - Microsoft MVP - C++
"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )
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I'm sorry I guess I wasnt clear. I get this error when i try to build.
'Service.Test222(string, string, string)' is a 'method' but is used like a 'type'
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Oh, OK. The code looks wrong to me, shouldn't say return *new* Class1(x,y,z); ?
Christian Graus - Microsoft MVP - C++
"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )
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It looks as though it's one of two options. Either the Class1 mentioned in the catch/finally block refers to a method on the web service which returns an instance of Class1, or you are missing a new statement on the return Class1 constructor.
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I guess my real question is how to make class1 work as a type. When i put class1 in front of Hello world I get an error. How do i declare/create it so I can use that class1 type
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It should exist as webserviceNamespace.class1. Can you see it declared in the code created when you import the webservice ?
Christian Graus - Microsoft MVP - C++
"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )
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You are getting me closer. Again I appreciate it. Here is my exact code(I've simplified it). If i want to return those three arguments what do i have to do?
using System;
using System.Web;
using System.Web.Services;
using System.Web.Services.Protocols;
[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
public class Class1 : System.Web.Services.WebService
{ }
public class Service : System.Web.Services.WebService
{
public Service () {
//Uncomment the following line if using designed components
//InitializeComponent();
}
[WebMethod]
public Class1 Hello() {
return new Class1("1","2","3");
}
}
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You are close, now you need to provide an overloaded constructor for Class1 to take your 3 string arguements. It would look something like this:
public class Class1 : WebService
{
public Class1(string one, string two, string three)
{
this.one = one;
this.two = two;
this.three = three;
}
public Class1 Hello()
{
return new Class("1", "2", "3");
}
}
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when i run that (see the code below) I get this error. Class1 cannot be serialized because it does not have a parameterless constructor.
public class Class1 : System.Web.Services.WebService
{
public Class1(string strOne, string strTwo)
{
strOne = strOne;
strTwo = strTwo;
}
[WebMethod]
public Class1 HelloWorld(string str1, string str2)
{
return new Class1(str1,str2);
}
}
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brsecu wrote: when i run that (see the code below) I get this error. Class1 cannot be serialized because it does not have a parameterless constructor.
Just add a default constructor as well that has no parameters:
public class Class1 : WebService
{
public Class1(){}
public Class1(string s1, string s2, string s3)
{
}
}
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Thanks for your patience with me.
OK i did that and it builds but now I get this error:
Cannot serialize member System.ComponentModel.MarshalByValueComponent.Site of type System.ComponentModel.ISite because it is an interface.
using System;
using System.Data;
using System.Web;
using System.Collections;
using System.Web.Services;
using System.Web.Services.Protocols;
using System.ComponentModel;
namespace WebService1
{
///
/// Summary description for Service1
///
[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
[ToolboxItem(false)]
public class Class1 : System.Web.Services.WebService
{
public string _strOne;
public string _strTwo;
public Class1()
{
}
public Class1(string strOne, string strTwo)
{
this._strOne = strOne;
this._strTwo = strTwo;
}
[WebMethod]
public Class1 HelloWorld(string str1, string str2)
{
str1 = "1";
str2 = "2";
return new Class1(str1,str2);
}
}
}
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thanks to all who help...
1)How do i read a 2 byte, 4 byte, or 8 byte value? I know how to read a one byte, but that only goes up to 255...
2)If any of you are familiar assembly, i need know now how to change (write) to an addresses hex dump, also known as Array of Byte (in most memory editing engines).
3) Reading/writing to a pointer I.E (0x1009624, offset: 0xb14), or any other pointer...
thanks in advanced
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What does this relate to ? Where are you reading from ?
pointers are easy, you just create an unsafe block, and you can manipulate them, as if they are an array.
Christian Graus - Microsoft MVP - C++
"I am working on a project that will convert a FORTRAN code to corresponding C++ code.I am not aware of FORTRAN syntax" ( spotted in the C++/CLI forum )
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1)
Code:
ProcessMemoryReaderLib.ProcessMemoryReader memedit = new ProcessMemoryReaderLib.ProcessMemoryReader();
memedit.ReadProcess = myprocess[0];
memedit.OpenProcess();
int bytesread; //needed
int byteswritten; //needed
int address = 0x1009624; //address
int value; //value of address
short value2=444; //for writing 2 byte, 444 for the value
byte[] memory; //for reading byte reading
memory = memedit.ReadProcessMemory((IntPtr)address, 1, out bytesread); //starts out as a byte array...i'm wondering how to get around this...
value = memory[0];
MessageBox.Show(value.ToString());
//writing memory =
BitConverter.GetBytes(value2);
memedit.WriteProcessMemory((IntPtr)address, memory, out byteswritten);
As you can see, when you read an address...the value is assigned to a byte array, how do I get around this? Like if I want to read a 4-byte value.
2) I need to be able to make a IntPtr pointer to an address with an offset, aka a pointer...should be simple but i can't figure it out...
3) I need to be able to edit or change the hex dump of an address, for example... lets say the hex dump of an address is 8f 00 00 00 ae 00 3f or something, i need to be able to change it to 8f 01 00 00 00 ae 00 3f. That's just an example...thanks in advance.
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Hi,
1.
I am unfamiliar with ProcessMemoryReaderLib; if it only offers Read methods
that return byte[] then it is up to you to convert some bytes into other types
such as int. There are basically two ways to do this:
- algorithmically, writing some code that performs the necessary calculations
- thru a memory-based union (one of the tricks from good old Fortran days):
create a struct that contains both data types, and give it marshaling attributes
that make the members occupy the same memory addresses (FieldOffset).
The former requires you take care of big-endian/little-endian considerations,
the latter will apply your machine's endianness (LE for x86).
BTW if you want an array in your union, you must "flatten" it, by applying
additional attributes as in:
[MarshalAs(UnmanagedType.ByValArray, SizeConst = 4)] public byte[] myArray;
otherwise the struct simply stores the array reference.
2.
You can convert an IntPtr to an int using one of its methods; then add to it,
and cast it back to an IntPtr.
3.
if by changing a hex dump you mean changing the memory content, it seems you
need some code to modify the byte[] you read, and then pass it back to the
appropriate Write method. Your target process may suffer !
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OK GREAT! But i still don't understand 2 very well, could you elaborate a little?
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Some variations are possible, e.g.
IntPtr myIntPtr2=new IntPtr(myIntPtr1.ToInt32()+myIntOffset);
BTW on Win64 you would have to use ToInt64(), and long instead of int, and
make sure the expression evaluates using long.
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so if you are correct, this would work:
IntPtr myIntPtr1 = (IntPtr)0x1009624;
int myIntOffset = 0x1b;
IntPtr myIntPtr2 = new IntPtr(myIntPtr1.ToInt32() + myIntOffset);
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same thing again...it's just adding them together in hex and converting them to decimal...not the pointer of the process's memory at all! any suggestions?
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but that does work:
0x1009624 + 0x1b = 0x100963F
is the same as
16815652 + 27 = 16815679
which is what the code produces. hex, decimal, they're both integer values so it's straight integer addition, what are you expecting to happen?
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If you know what pointers are or have had a little experience with ASM, then you know what pointers are. They are addresses that change positions every time the program is reopened, or rather pointers go to the address that changes ever time you reopen the application. If it were as simple as adding them together, I would just use 0x100963f rather than wasting time adding two together...for example in an old game that i used to play, the value for your population was a pointer, and it was not the address+offset...in fact if you took the address and made its offset 0, it would return a completely different address, and if you added to that offset, it would increase the address. Confusing? Here's what i mean:
address: 00400000
offset: 0
address of pointer: A48DAC8
or something like that
but if you increase the offset, it adds to the address of the pointer so:
address: 00400000
offset: b14
address of pointer: A48E5DC
I know it can be done in c++ and delphi and I think it can be done in C#, but i'm not sure exactly how to do it.
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A pointer is a variable that holds a memory address and a memory address is an integer value, nothing more, nothing less. It's a given that the pointers you're using are going to change every time that you run an application because every time it's run there's no guarantee that the OS is going to assign it the same memory region. That's just common sense.
The explanation and example you've provided involving the "address", "offset" and "address of pointer" show one of two things:
a) your idea of what a pointer is is not correct or
b) you're misusing terminology to describe the situation
Either way, the fact remains that in C#, this style of memory management is completely outdated. C# is a Garbage Collected language so that you don't have to worry about where in memory things are; if your program relies on pointer arithmetic and memory regions to get it's job done, then you've picked the wrong language to implement your design.
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OK, you DO know what pointers are, we're just using different terminology, and if you want to use C# then there's no reason to use them. The "master" that you're referencing leaves out something very important about pointers and memory: those "Static memory addresses" and "Dynamic memory locations" aren't just pulled out of thin air. Those addresses MUST be reserved by your application in some way so that nothing overwrites your data there. The example he's using seems to be using Intel Assembly - assembly language is a whole different ballgame from any high level language. In assembly you have to know the address of all your data because there isn't the same concept of a variable like there is C/C++/C#/JAVA/etc. See here[^] for the proper usage of pointers in C++. In C# forget about pointers entirely until you're Marshaling data between managed and unmanaged code.
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