how to call a assembly implemented function in C++??

[timon]

I used to use Dev C++, and this year i started to use C++ Builder and Visual Studio too.
I use ml.exe to assembly my .asm and get a .obj.
In Dev C++ there's no .obj, there's .o so i have no idea what i have to do.
In C++ Builder i have read i must to do:
1
ml /c /Zf /omf function.asm
to obtain the .obj
2 Add the .obj to the project
3 Introduce this line before as a kind of include (declare the function)
extern void estados (char* , char* , char* , int , int );

the problem is that this works in a C project, but not in a C++ project and i want a C++ project.

In Visual Studio
i have to add the .asm to the project and, in the properties of the file change this in Custom Build Step:
command line: C:\rede2\rede2\ml /c /Zf /omf function.asm
outputs: function.obj
(Of course, that depends of the location of ml.exe)
But i get an error message like this:

invalid or corrupt file: cannot read at 0x2CE function.obj line 1

Can anyone help me in any compiler???
thanks since now.

[weaknessforcats]

The most I know how to do is use the __asm keyword for Visual Studio.NET 2005.

However, this is Microsoft specific.

This example is from the Microsft docset:

__asm {
   mov al, 2
   mov dx, 0xD007
   out dx, al
}
 
 

What this does is call the inline assembler.

Check it out.

[timon]

thank you!!
but, let me ask you another question.
if i had, for example, pointers (or another variable). how can i move this data to the registers
ex.:

char* myPtr = new char[20];
 
__asm {
 
     MOV CX, 20
     MOV EAX, myPtr
bucle:
     MOV [EAX], 0
     INC EAX
     DEC CX
     JNZ bucle
}
 

????????
i don't know if i can do that, so how i can do this??

[weaknessforcats]

This is my jumping off point. I'm just a C++ person. However, I would like to know how to do that so I can amaze my students.

[drhowarddrfine]

If you leave the pointer in eax then:

mov ebx,[eax]

would put the data pointed to by eax into ebx.