import core.sys.windows.windows;

void main(string[] args) {
	// I'm aware it would not work properly.
	int formatIndex = ChoosePixelFormat(null, null);
}

When I compile the code above I'm getting the following link error:

OPTLINK (R) for Win32  Release 8.00.17
Copyright (C) Digital Mars 1989-2013  All rights reserved.
http://www.digitalmars.com/ctg/optlink.html
console-app.obj(console-app)
 Error 42: Symbol Undefined _ChoosePixelFormat@8

OS: Win 8.1 Pro
DMD: v2.070.0

Maybe I have to install something. Any thoughts?
Thank you.

On 16/02/16 6:36 PM, ref2401 wrote:
> import core.sys.windows.windows;
>
> void main(string[] args) {
>      // I'm aware it would not work properly.
>      int formatIndex = ChoosePixelFormat(null, null);
> }
>
> When I compile the code above I'm getting the following link error:
>
> OPTLINK (R) for Win32  Release 8.00.17
> Copyright (C) Digital Mars 1989-2013  All rights reserved.
> http://www.digitalmars.com/ctg/optlink.html
> console-app.obj(console-app)
>   Error 42: Symbol Undefined _ChoosePixelFormat@8
>
> OS: Win 8.1 Pro
> DMD: v2.070.0
>
> Maybe I have to install something. Any thoughts?
> Thank you.

Try compiling with 64bit.
If it works, its just the import libs not containing the symbol.

On Tuesday, 16 February 2016 at 05:39:26 UTC, Rikki Cattermole wrote:
> Try compiling with 64bit.
> If it works, its just the import libs not containing the symbol.

dmd main.d -ofconsole-app.exe -debug -unittest -wi -m64

That's what I'm getting now:

console-app.obj : error LNK2019: unresolved external symbol ChoosePixelFormat referenced in function _Dmain
console-app.exe : fatal error LNK1120: 1 unresolved externals

On 16/02/16 7:13 PM, ref2401 wrote:
> On Tuesday, 16 February 2016 at 05:39:26 UTC, Rikki Cattermole wrote:
>> Try compiling with 64bit.
>> If it works, its just the import libs not containing the symbol.
>
> dmd main.d -ofconsole-app.exe -debug -unittest -wi -m64
>
> That's what I'm getting now:
>
> console-app.obj : error LNK2019: unresolved external symbol
> ChoosePixelFormat referenced in function _Dmain
> console-app.exe : fatal error LNK1120: 1 unresolved externals

Found the problem, you haven't linked against gdi.

On Tuesday, 16 February 2016 at 06:22:33 UTC, Rikki Cattermole wrote:
> Found the problem, you haven't linked against gdi.

Thank you It works. I should have done this:

set filesToUse=main.d gdi32.lib
dmd @filesToUse -ofconsole-app.exe -debug -unittest -wi