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README.win32.md: Add info on roapi.h

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The roapi.h that is included with the Windows 8.0 SDK mostly works under
plain C with one exception, so let people know the fix for that.  Note
that the Windows 8.1 and 10 SDKs contain copies of roapi.h that is
directly usable under plain C.
This commit is contained in:
Chun-wei Fan 2021-03-31 17:02:16 +08:00
parent ce660066f2
commit a54af2f36f
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README.win32.md
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@ -163,7 +163,33 @@ normally.
### Support for pre-2012 Visual Studio
This release of GLib requires at least the Windows 8 SDK in order to be built
This release of GLib requires at least the Windows 8.0 SDK in order to be built
successfully using Visual Studio, which means that it is no longer supported to
build GLib with Visual Studio 2008 nor 2010. People that still need to use
Visual Studio 2008 or 2010 should continue to use glib-2.66.x.
The Windows 8.0 SDK headers may contain an `roapi.h` that cannot be used under plain
C, so to remedy that, change the following lines (around lines 55-57):
```
// RegisterActivationFactory/RevokeActivationFactory registration cookie
typedef struct {} *RO_REGISTRATION_COOKIE;
// RegisterActivationFactory/DllGetActivationFactory callback
```
to
```
// RegisterActivationFactory/RevokeActivationFactory registration cookie
#ifdef __cplusplus
typedef struct {} *RO_REGISTRATION_COOKIE;
#else
typedef struct _RO_REGISTRATION_COOKIE *RO_REGISTRATION_COOKIE; /* make this header includable in C files */
#endif
// RegisterActivationFactory/DllGetActivationFactory callback
```
This follows what is done in the Windows 8.1 SDK, which contains an `roapi.h`
that is usable under plain C. Please note that you might need to copy that file
into a location that is in your `%INCLUDE%` which precedes the include path for the
Windows 8.0 SDK headers, if you do not have administrative privileges.