So I started using Glad but I can't get WGL to work with it, though I think this is more of a Win32 issue than WGL.

wndclass.lpfnWndProc   = &WndProc;

Gives me an error no matter what:
Error: cannot implicitly convert expression (& WndProc) of type int function(void* hWnd, uint message, uint wParam, int lParam) to extern (Windows) int function(void*, uint, uint, int) nothrow

I think the error has to do with the nothrow but I tried making the function empty

extern(Windows)
LRESULT WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
{
   return 0;
}

And still got the same exact error. Any ideas/help?

On Wednesday, 13 January 2016 at 18:34:14 UTC, Josh Phillips wrote:
> So I started using Glad but I can't get WGL to work with it, though I think this is more of a Win32 issue than WGL.
>
> wndclass.lpfnWndProc   = &WndProc;
>
> Gives me an error no matter what:
> Error: cannot implicitly convert expression (& WndProc) of type int function(void* hWnd, uint message, uint wParam, int lParam) to extern (Windows) int function(void*, uint, uint, int) nothrow
>
> I think the error has to do with the nothrow but I tried making the function empty
>
> extern(Windows)
> LRESULT WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)
> {
>    return 0;
> }
>
> And still got the same exact error. Any ideas/help?

Your function isnt marked nothrow.

On Wednesday, 13 January 2016 at 18:34:14 UTC, Josh Phillips wrote:
> extern(Windows)
> LRESULT WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam)

You just need to explicitly mark it nothrow in the signature. Add `nothrow` to the end of the param list:

extern(Windows)
LRESULT WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam) nothrow

and then you'll be cool

On Wednesday, 13 January 2016 at 18:37:09 UTC, Adam D. Ruppe wrote:
> You just need to explicitly mark it nothrow in the signature. Add `nothrow` to the end of the param list:
>
> extern(Windows)
> LRESULT WndProc(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam) nothrow
>
> and then you'll be cool

Oh wow that's easy. They should really make that more clear in the dlang reference. They way it sounds there made me think that if a function doesn't throw any errors it automatically is 'nothrow'

@Dav1d do I need to implicitly link WGL to any dlls or anything? Now I'm getting linking errors

..\dlibgui\lib\dlibgui.lib(window)
 Error 42: Symbol Undefined _wglMakeCurrent@8
..\dlibgui\lib\dlibgui.lib(window)
 Error 42: Symbol Undefined _wglCreateContext@4
..\dlibgui\lib\dlibgui.lib(window)
 Error 42: Symbol Undefined _ChoosePixelFormat@8
..\dlibgui\lib\dlibgui.lib(window)
 Error 42: Symbol Undefined _SetPixelFormat@12
..\dlibgui\lib\dlibgui.lib(window)
 Error 42: Symbol Undefined _wglDeleteContext@4
--- errorlevel 5
dmd failed with exit code 5.

On Wednesday, 13 January 2016 at 19:05:30 UTC, Josh Phillips wrote:
> On Wednesday, 13 January 2016 at 18:37:09 UTC, Adam D. Ruppe wrote:
>> [...]
>
> Oh wow that's easy. They should really make that more clear in the dlang reference. They way it sounds there made me think that if a function doesn't throw any errors it automatically is 'nothrow'
>
> [...]

Link with opengl32.lib

On Wednesday, 13 January 2016 at 19:05:30 UTC, Josh Phillips wrote:
> Oh wow that's easy. They should really make that more clear in the dlang reference. They way it sounds there made me think that if a function doesn't throw any errors it automatically is 'nothrow'

No, because actually you can have a function that uses sub-functions that throw, but marked explicitly nothrow, because it hides the stuff under the carpet.

---
void bar()
{
    throw new Exception("kaboom");
}

void foo() nothrow
{
  try {bar;}
  catch {/*under the carpet*/}
}
---

and that will compile.

On Wednesday, 13 January 2016 at 20:08:55 UTC, Dav1d wrote:
> Link with opengl32.lib

How? Everywhere I looked it says this cannot be done due to conflicting formats between the dmd compiler and the windows one.

On Thursday, 14 January 2016 at 02:16:40 UTC, userABCabc123 wrote:
> On Wednesday, 13 January 2016 at 19:05:30 UTC, Josh Phillips wrote:
>> Oh wow that's easy. They should really make that more clear in the dlang reference. They way it sounds there made me think that if a function doesn't throw any errors it automatically is 'nothrow'
>
> No, because actually you can have a function that uses sub-functions that throw, but marked explicitly nothrow, because it hides the stuff under the carpet.
>
> ---
> void bar()
> {
>     throw new Exception("kaboom");
> }
>
> void foo() nothrow
> {
>   try {bar;}
>   catch {/*under the carpet*/}
> }
> ---
>
> and that will compile.

Ok? I'm not sure what you are saying no to and I understand this. It makes sense because foo catches bar's error and doesn't throw it up and further. I was just saying that the reference here https://dlang.org/spec/function.html was not all that clear since the section entitled nothrow merely states:

"Nothrow functions do not throw any exceptions derived from class Exception.
Nothrow functions are covariant with throwing ones."

A deeper search on the page made me realize that there are more examples later which clarify how to declare a "nothrow" function however I didn't bother looking deeper at the time since the main section for nothrows gave no indication that I should.

On Thursday, 14 January 2016 at 02:35:28 UTC, Josh Phillips wrote:
> On Wednesday, 13 January 2016 at 20:08:55 UTC, Dav1d wrote:
>> Link with opengl32.lib
>
> How? Everywhere I looked it says this cannot be done due to conflicting formats between the dmd compiler and the windows one.

Welcome to D and Windows. You can use GDC or LDC or try http://wiki.dlang.org/Installing_DMD_on_64-bit_Windows_7_(COFF-compatible)

Or you find an OMF opengl32.lib OR you make your own with implib and coff2omf
http://www.digitalmars.com/ctg/implib.html
http://www.digitalmars.com/ctg/coff2omf.html
I dont really remember how that worked.

On Thursday, 14 January 2016 at 09:25:50 UTC, Dav1d wrote:
> On Thursday, 14 January 2016 at 02:35:28 UTC, Josh Phillips wrote:
>> On Wednesday, 13 January 2016 at 20:08:55 UTC, Dav1d wrote:
>>> Link with opengl32.lib
>>
>> How? Everywhere I looked it says this cannot be done due to conflicting formats between the dmd compiler and the windows one.
>
> Welcome to D and Windows. You can use GDC or LDC or try http://wiki.dlang.org/Installing_DMD_on_64-bit_Windows_7_(COFF-compatible)
>
> Or you find an OMF opengl32.lib OR you make your own with implib and coff2omf
> http://www.digitalmars.com/ctg/implib.html
> http://www.digitalmars.com/ctg/coff2omf.html
> I dont really remember how that worked.

There is also objconv: http://www.agner.org/optimize/

I found in an older code:

echo "implib /s opengl32.lib opengl32.dll && exit" | cmd

So maybe `implib /s opengl32.lib opengl32.dll` is enough. Would like to help you more, but I didnt need to deal with this shit lately (luckily) and forgot most of this mess.