How to save InPtr to a raw file?

[Sharon]

Hello gurus,

I have a System.IntPtr pointing to the memory address of my image (not a
..NET image).
I wish to save this image data pointed by the IntPtr to a raw data file. The
way I now to that is:

System.IO.FileS tream file = new System.IO.FileS tream(fileName,
System.IO.FileM ode.Create);
file.Write(byte[], 0, ...);
file.Close();

But the FileStream.Writ e takes byte[] which I do not have.
How can I save this image data pointed by IntPtr to file?

---------
Thanks
Sharon

[Laura T.]

Is your IntPtr a bitmap handle (hBitmap) or a direct pointer to raw data?
If it is, you could construct an Image.FromHBitm ap and then serialize the
image class.
Otherwise you need to convert it to a byte[], for example by means of
System.Runtime. InteropServices .Marshal.ReadIn tPtr or like.

Laura

"Sharon" <Sh*****@newsgr oups.nospam> ha scritto nel messaggio
news:4A******** *************** ***********@mic rosoft.com...

Hello gurus,

I have a System.IntPtr pointing to the memory address of my image (not a
.NET image).
I wish to save this image data pointed by the IntPtr to a raw data file.
The
way I now to that is:

System.IO.FileS tream file = new System.IO.FileS tream(fileName,
System.IO.FileM ode.Create);
file.Write(byte[], 0, ...);
file.Close();

But the FileStream.Writ e takes byte[] which I do not have.
How can I save this image data pointed by IntPtr to file?

---------
Thanks
Sharon

[Willy Denoyette [MVP]]

"Sharon" <Sh*****@newsgr oups.nospam> wrote in message
news:4A******** *************** ***********@mic rosoft.com...
| Hello gurus,
|
| I have a System.IntPtr pointing to the memory address of my image (not a
| .NET image).
| I wish to save this image data pointed by the IntPtr to a raw data file.
The
| way I now to that is:
|
| System.IO.FileS tream file = new System.IO.FileS tream(fileName,
| System.IO.FileM ode.Create);
| file.Write(byte[], 0, ...);
| file.Close();
|
| But the FileStream.Writ e takes byte[] which I do not have.
| How can I save this image data pointed by IntPtr to file?
|
|
|
| ---------
| Thanks
| Sharon

You can use Marshal.Copy to copy the memory contents to a byte[].

Willy.

[Stoitcho Goutsev \(100\)]

Sharon,

The fact that you are using IntPtr makes me believe that your data is in
unmanaged memory. To get the data in managed byte array you can use
System.Runtime. InteropServices .Marshal class.
You can use the Marshal.ReadByt e methods to loop through the data in
unmanaged memory and copy it one byte at a time in a managed byte[] or you
can create a structure with byte array in it and use Marshal.PtrToSt ructure
method to read it at once. The latter I haven't tried, but should work.
--
HTH
Stoitcho Goutsev (100)
"Sharon" <Sh*****@newsgr oups.nospam> wrote in message
news:4A******** *************** ***********@mic rosoft.com...

Hello gurus,

I have a System.IntPtr pointing to the memory address of my image (not a
.NET image).
I wish to save this image data pointed by the IntPtr to a raw data file.
The
way I now to that is:

System.IO.FileS tream file = new System.IO.FileS tream(fileName,
System.IO.FileM ode.Create);
file.Write(byte[], 0, ...);
file.Close();

But the FileStream.Writ e takes byte[] which I do not have.
How can I save this image data pointed by IntPtr to file?

---------
Thanks
Sharon

[Stoitcho Goutsev \(100\)]

Willy,

Isn't it Marshal.Copy copy from managed to unmanaged? In other words from
byte[] to memory pointed by IntPtr. I think Sharon needs the other way
around.
--

Stoitcho Goutsev (100)

"Willy Denoyette [MVP]" <wi************ *@telenet.be> wrote in message
news:uX******** ******@TK2MSFTN GP04.phx.gbl...

"Sharon" <Sh*****@newsgr oups.nospam> wrote in message
news:4A******** *************** ***********@mic rosoft.com...
| Hello gurus,
|
| I have a System.IntPtr pointing to the memory address of my image (not a
| .NET image).
| I wish to save this image data pointed by the IntPtr to a raw data file.
The
| way I now to that is:
|
| System.IO.FileS tream file = new System.IO.FileS tream(fileName,
| System.IO.FileM ode.Create);
| file.Write(byte[], 0, ...);
| file.Close();
|
| But the FileStream.Writ e takes byte[] which I do not have.
| How can I save this image data pointed by IntPtr to file?
|
|
|
| ---------
| Thanks
| Sharon

You can use Marshal.Copy to copy the memory contents to a byte[].

Willy.

[Willy Denoyette [MVP]]

There are overloads for both from managed to unmanaged and unmanaged to
managed.

Willy.

"Stoitcho Goutsev (100)" <10*@100.com> wrote in message
news:Od******** ******@TK2MSFTN GP02.phx.gbl...
| Willy,
|
| Isn't it Marshal.Copy copy from managed to unmanaged? In other words from
| byte[] to memory pointed by IntPtr. I think Sharon needs the other way
| around.
|
|
| --
|
| Stoitcho Goutsev (100)
|
| "Willy Denoyette [MVP]" <wi************ *@telenet.be> wrote in message
| news:uX******** ******@TK2MSFTN GP04.phx.gbl...
| >
| > "Sharon" <Sh*****@newsgr oups.nospam> wrote in message
| > news:4A******** *************** ***********@mic rosoft.com...
| > | Hello gurus,
| > |
| > | I have a System.IntPtr pointing to the memory address of my image (not
a
| > | .NET image).
| > | I wish to save this image data pointed by the IntPtr to a raw data
file.
| > The
| > | way I now to that is:
| > |
| > | System.IO.FileS tream file = new System.IO.FileS tream(fileName,
| > | System.IO.FileM ode.Create);
| > | file.Write(byte[], 0, ...);
| > | file.Close();
| > |
| > | But the FileStream.Writ e takes byte[] which I do not have.
| > | How can I save this image data pointed by IntPtr to file?
| > |
| > |
| > |
| > | ---------
| > | Thanks
| > | Sharon
| >
| > You can use Marshal.Copy to copy the memory contents to a byte[].
| >
| > Willy.
| >
| >
|
|

[Ignacio Machin \( .NET/ C# MVP \)]

Hi,

You are correct, Copy is to send data to unmanaged
--
Ignacio Machin,
ignacio.machin AT dot.state.fl.us
Florida Department Of Transportation

"Stoitcho Goutsev (100)" <10*@100.com> wrote in message
news:Od******** ******@TK2MSFTN GP02.phx.gbl...

Willy,

Isn't it Marshal.Copy copy from managed to unmanaged? In other words from
byte[] to memory pointed by IntPtr. I think Sharon needs the other way
around.
--

Stoitcho Goutsev (100)

"Willy Denoyette [MVP]" <wi************ *@telenet.be> wrote in message
news:uX******** ******@TK2MSFTN GP04.phx.gbl...

"Sharon" <Sh*****@newsgr oups.nospam> wrote in message
news:4A******** *************** ***********@mic rosoft.com...
| Hello gurus,
|
| I have a System.IntPtr pointing to the memory address of my image (not
a
| .NET image).
| I wish to save this image data pointed by the IntPtr to a raw data
file.
The
| way I now to that is:
|
| System.IO.FileS tream file = new System.IO.FileS tream(fileName,
| System.IO.FileM ode.Create);
| file.Write(byte[], 0, ...);
| file.Close();
|
| But the FileStream.Writ e takes byte[] which I do not have.
| How can I save this image data pointed by IntPtr to file?
|
|
|
| ---------
| Thanks
| Sharon

You can use Marshal.Copy to copy the memory contents to a byte[].

Willy.

[Ignacio Machin \( .NET/ C# MVP \)]

Hi,

I find hard to believe there is no way to copy a chunk of data from
unmanaged memory, I was under the impression that Copy worked both way ,
It's not it can only be used from managed to unmanaged.

I haven't been able to find the other way around though.

"Stoitcho Goutsev (100)" <10*@100.com> wrote in message
news:Og******** ******@TK2MSFTN GP02.phx.gbl...

Sharon,

The fact that you are using IntPtr makes me believe that your data is in
unmanaged memory. To get the data in managed byte array you can use
System.Runtime. InteropServices .Marshal class.
You can use the Marshal.ReadByt e methods to loop through the data in
unmanaged memory and copy it one byte at a time in a managed byte[] or you
can create a structure with byte array in it and use
Marshal.PtrToSt ructure method to read it at once. The latter I haven't
tried, but should work.
--
HTH
Stoitcho Goutsev (100)
"Sharon" <Sh*****@newsgr oups.nospam> wrote in message
news:4A******** *************** ***********@mic rosoft.com...

Hello gurus,

I have a System.IntPtr pointing to the memory address of my image (not a
.NET image).
I wish to save this image data pointed by the IntPtr to a raw data file.
The
way I now to that is:

System.IO.FileS tream file = new System.IO.FileS tream(fileName,
System.IO.FileM ode.Create);
file.Write(byte[], 0, ...);
file.Close();

But the FileStream.Writ e takes byte[] which I do not have.
How can I save this image data pointed by IntPtr to file?

---------
Thanks
Sharon

[Willy Denoyette [MVP]]

Still using V1.0? Marshal.Copy has overloads to copy from unmanaged to
managed since v1.1.

http://msdn.microsoft.com/library/de...scopytopic.asp

Willy.

"Ignacio Machin ( .NET/ C# MVP )" <ignacio.mach in AT dot.state.fl.us > wrote
in message news:Ov******** ******@TK2MSFTN GP03.phx.gbl...
| Hi,
|
| You are correct, Copy is to send data to unmanaged
|
|
| --
| Ignacio Machin,
| ignacio.machin AT dot.state.fl.us
| Florida Department Of Transportation
|
| "Stoitcho Goutsev (100)" <10*@100.com> wrote in message
| news:Od******** ******@TK2MSFTN GP02.phx.gbl...
| > Willy,
| >
| > Isn't it Marshal.Copy copy from managed to unmanaged? In other words
from
| > byte[] to memory pointed by IntPtr. I think Sharon needs the other way
| > around.
| >
| >
| > --
| >
| > Stoitcho Goutsev (100)
| >
| > "Willy Denoyette [MVP]" <wi************ *@telenet.be> wrote in message
| > news:uX******** ******@TK2MSFTN GP04.phx.gbl...
| >>
| >> "Sharon" <Sh*****@newsgr oups.nospam> wrote in message
| >> news:4A******** *************** ***********@mic rosoft.com...
| >> | Hello gurus,
| >> |
| >> | I have a System.IntPtr pointing to the memory address of my image
(not
| >> a
| >> | .NET image).
| >> | I wish to save this image data pointed by the IntPtr to a raw data
| >> file.
| >> The
| >> | way I now to that is:
| >> |
| >> | System.IO.FileS tream file = new System.IO.FileS tream(fileName,
| >> | System.IO.FileM ode.Create);
| >> | file.Write(byte[], 0, ...);
| >> | file.Close();
| >> |
| >> | But the FileStream.Writ e takes byte[] which I do not have.
| >> | How can I save this image data pointed by IntPtr to file?
| >> |
| >> |
| >> |
| >> | ---------
| >> | Thanks
| >> | Sharon
| >>
| >> You can use Marshal.Copy to copy the memory contents to a byte[].
| >>
| >> Willy.
| >>
| >>
| >
| >
|
|

[Stoitcho Goutsev \(100\)]

Yup, you are right. My apologies.

--

Stoitcho Goutsev (100)

"Willy Denoyette [MVP]" <wi************ *@telenet.be> wrote in message
news:%2******** ********@TK2MSF TNGP04.phx.gbl. ..

There are overloads for both from managed to unmanaged and unmanaged to
managed.

Willy.

"Stoitcho Goutsev (100)" <10*@100.com> wrote in message
news:Od******** ******@TK2MSFTN GP02.phx.gbl...
| Willy,
|
| Isn't it Marshal.Copy copy from managed to unmanaged? In other words
from
| byte[] to memory pointed by IntPtr. I think Sharon needs the other way
| around.
|
|
| --
|
| Stoitcho Goutsev (100)
|
| "Willy Denoyette [MVP]" <wi************ *@telenet.be> wrote in message
| news:uX******** ******@TK2MSFTN GP04.phx.gbl...
| >
| > "Sharon" <Sh*****@newsgr oups.nospam> wrote in message
| > news:4A******** *************** ***********@mic rosoft.com...
| > | Hello gurus,
| > |
| > | I have a System.IntPtr pointing to the memory address of my image
(not
a
| > | .NET image).
| > | I wish to save this image data pointed by the IntPtr to a raw data
file.
| > The
| > | way I now to that is:
| > |
| > | System.IO.FileS tream file = new System.IO.FileS tream(fileName,
| > | System.IO.FileM ode.Create);
| > | file.Write(byte[], 0, ...);
| > | file.Close();
| > |
| > | But the FileStream.Writ e takes byte[] which I do not have.
| > | How can I save this image data pointed by IntPtr to file?
| > |
| > |
| > |
| > | ---------
| > | Thanks
| > | Sharon
| >
| > You can use Marshal.Copy to copy the memory contents to a byte[].
| >
| > Willy.
| >
| >
|
|