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Loset
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Joined: 18 Apr 2015
Posts: 34
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 Posted: Wed Aug 12, 2020 5:52 pm Post subject: How do you create a System.String in mono? |
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I need to use Mono.invoke on a method that accepts a String,
A string is not some random "textgoeshere", It's an object I need to create an instance of and send to the proper method,
So I need to create a new instance of the class System.String, But not sure how to do it.
I tried to allocate it myself using allocMemory, I then tried to use the System.String.ctor method to invoke it
| Code: | local test = mono_findMethod('',"String",".ctor");
local alloc = allocateMemory(100);
writeString(alloc,"testing",true)
local resda = mono_invoke_method(1, test,nil , {{type = vtPointer, value = alloc}}) |
anyways I tried both using vtString as type and using some "random string"
or whatever nothing seems to give me back a valid pointer to the instance.
ignore var names  was 2am and I wanted to do final tests before bed. |
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Dark Byte
Site Admin
 Reputation: 471
Joined: 09 May 2003
Posts: 25840
Location: The netherlands
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| Posted: Wed Aug 12, 2020 10:52 pm Post subject: |
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tried
| Code: |
mono_invoke_method(nil, method, classInstance, {{type = vtPointer, value = 'testing'}})
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do you have the proper method and do you have a proper address of the class object?
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Loset
Cheater
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Joined: 18 Apr 2015
Posts: 34
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| Posted: Thu Aug 13, 2020 2:54 am Post subject: |
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| Code: | local stringConstructor = mono_findMethod('',"String",".ctor");
local newStr = mono_invoke_method(nil, stringConstructor,nil , {{type = vtPointer, value = "myStr"}})
print("constructor is: ", stringConstructor)
print("string PTR is:", newStr);
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output:
| Code: |
constructor is: 140151728
string PTR is:
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so string always comes out empty/nil, I dont have a class instance to invoke this method on because I'm trying to create a new instance by invoking the constructor, But I also tried using the class pointer as the instance.
Also could be that I don't have the right method because String class has 6 constructor overloads, I aint sure how to select a specific one between them |
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Bloodybone
Newbie cheater
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Joined: 07 Dec 2016
Posts: 21
Location: Germany
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| Posted: Mon Aug 17, 2020 2:47 pm Post subject: |
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Maybe try this
| Code: | local function CreateMonoString(s)
return executeCodeEx(1,1000,getAddress("mono_string_new"),{type=0,value=mono_enumDomains()[1]},{type=3,value=s})
end
local mstring = CreateMonoString("Test String")
if (targetIs64Bit()) then
print(string.format("String Instance:0x%X",mstring))
print("String Length:"..readInteger(mstring+0x10))
print("String in UTF16 Form:"..readString(mstring+0x14,readInteger(mstring+0x10)*2,true))
local s = ""
local bytesastable = readBytes(mstring+0x14,readInteger(mstring+0x10)*2,true)
for _,v in ipairs(bytesastable) do
s = string.format("%s0x%X ",s,v)
end
print("String in Byte Form:"..s)
else
print(string.format("String Instance:0x%X",mstring))
print("String Length:"..readInteger(mstring+8))
print("String in UTF16 Form:"..readString(mstring+0xC,readInteger(mstring+8)*2,true))
local s = ""
local bytesastable = readBytes(mstring+0xC,readInteger(mstring+8)*2,true)
for _,v in ipairs(bytesastable) do
s = string.format("%s0x%X ",s,v)
end
print("String in Byte Form:"..s)
end |
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