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    <p>This answer applies to Delphi XE2 Update 2, I don't know if things have changed with Update 3. </p> <p>I started the Embarcadero thread. Starting up GDI+ from the host application isn't an option for me. So far everything is working from the DLL side without errors but nothing has been released to the outside world yet either. </p> <p>If you are able to modify your C host application, you may find the <a href="http://msdn.microsoft.com/en-us/library/ms534077%28v=vs.85%29.aspx" rel="nofollow">MSDN GdiplusStartup() documentation</a> useful. </p> <p>====</p> <h2>Using FireMonkey In a DLL Without Starting GDI+ In Host Application</h2> <p>Add this unit to your project:</p> <pre><code>unit InitFmxHack; interface procedure InitGDIP; // Call before using FMX. procedure FreeGDIP; // Call after using FMX. // NOTE: // InitGDIP() must be called before instantiating a FireMonkey form. // FreeGDIP() must be called after all FireMonkey forms are destroyed. // // InitGDIP/FreeGDIP can not be called from the initalization or finalization sections, // or any method called from these sections. // implementation uses System.SysUtils, Winapi.GDIPAPI, Winapi.GDIPOBJ, FMX.Types; var NeedToShutdownGDIPlus: Boolean; GDIPlusInput: TGDIPlusStartupInput; gdiplusToken: Cardinal; TempRgn: GpRegion; type TBitmapAccess = class(TBitmap); procedure InitGDIP; begin NeedToShutdownGDIPlus := False; case GdipCreateRegion(TempRgn) of Ok: GdipDeleteRegion(TempRgn); GdiplusNotInitialized: begin GDIPlusInput.GdiplusVersion := 1; GDIPlusInput.DebugEventCallback := nil; GDIPlusInput.SuppressBackgroundThread := False; GDIPlusInput.SuppressExternalCodecs := False; GdiplusStartup(GDIPlusToken, @GDIPlusInput, nil); NeedToShutdownGDIPlus := True; end; end; end; procedure FreeGDIP; begin // HACK: Need to forcibly release a GDI+ object held in a global variable. FreeAndNil(TBitmapAccess(GetMeasureBitmap).FCanvas); // These lines have been copied from Winapi.GDIPOBJ. I'm not 100% sure // if there needed but it's probably safer to include them as they are part of // the standard FireMonkey shutdown sequence. Similar code is also found in // the VGScene library. if Assigned(GenericSansSerifFontFamily) then FreeAndNil(GenericSansSerifFontFamily); if Assigned(GenericSerifFontFamily) then FreeAndNil(GenericSerifFontFamily); if Assigned(GenericMonospaceFontFamily) then FreeAndNil(GenericMonospaceFontFamily); if Assigned(GenericTypographicStringFormatBuffer) then FreeAndNil(GenericTypographicStringFormatBuffer); if Assigned(GenericDefaultStringFormatBuffer) then FreeAndNil(GenericDefaultStringFormatBuffer); // Finalise GDI+ here if needed... if NeedToShutdownGDIPlus then GdiplusShutdown(GDIPlusToken); end; end. </code></pre> <p>To use:</p> <pre><code>InitFmxHack.InitGDIP; // 1. Create form here. // 2. Use form. // 3. Destroy form. InitFmxHack.FreeGDIP; </code></pre>
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    1. COPerfect, thank you for the quick response. I had tried something similar but it turns out one of the extra exceptions I was receiving was due to incorrectly unloading the dll, nothing to do with GDI+. Never assume anything. Lesson learnt.
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    2. COit doesn't look like this works under XE3 as GetMeasureBitmap doesn't seem to exist anymore.
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    3. CO@Alister: That's no good. I've not upgraded to XE3 yet. Please post here if you find a workaround. Maybe it's worth contacting someone at Embarcadero again. There really should be an official way to initialize GDI+ from a DLL. (Requiring the host application to initialize GDI+ isn't a realistic option in some circumstances.)
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