System::IntPtr to HDC

[Manuel Costa]

How the hell do i convert System::IntPtr to HDC?

manuel

[Mattias Sjögren]

How the hell do i convert System::IntPtr to HDC?

Call IntPtr::ToPointer() and cast the result to HDC.

Mattias

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Mattias Sjögren [MVP] mattias @ mvps.org
http://www.msjogren.net/dotnet/ | http://www.dotnetinterop.com
Please reply only to the newsgroup.

[Manuel Costa]

I think that i have a compilation problem by mixing old code with new
directives for .net. (HDC)(int) returns an undifined value.
Any guess or suggestion to trace down the problem and find a possible
workaround?

manuel

"Mattias Sjögren" <ma********************@mvps.org> wrote in message
news:Ot**************@TK2MSFTNGP12.phx.gbl...

How the hell do i convert System::IntPtr to HDC?

Call IntPtr::ToPointer() and cast the result to HDC.

Mattias

--
Mattias Sjögren [MVP] mattias @ mvps.org
http://www.msjogren.net/dotnet/ | http://www.dotnetinterop.com
Please reply only to the newsgroup.

[ismailp]

See below:

HWND hwnd = (HWND)textBox1->Handle.ToPointer();
HDC hdc = GetDC(hwnd);
IntPtr dc = hdc;
HDC hdc_ = (HDC)dc.ToPointer();
ReleaseDC(hwnd, hdc_);

XXXPtr value types have a "ToPointer()" method, which give you a
"void*". You can convert void* to HWND, or HDC, which are actually
void*.

Ismail

[Manuel Costa]

It does not work.
Casting to HDC gives me an undifined value.
In this project i had some other weird problems like a stack overflow when a
specific constructor was invoked. I'm almost sure it is a problem with the
default directives for the .net compliance.

manuel
"ismailp" <pa*******@gmail.com> wrote in message
news:11*********************@z14g2000cwz.googlegro ups.com...

See below:

HWND hwnd = (HWND)textBox1->Handle.ToPointer();
HDC hdc = GetDC(hwnd);
IntPtr dc = hdc;
HDC hdc_ = (HDC)dc.ToPointer();
ReleaseDC(hwnd, hdc_);

XXXPtr value types have a "ToPointer()" method, which give you a
"void*". You can convert void* to HWND, or HDC, which are actually
void*.

Ismail