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how to solve "dereferencing pointer to incomplete type "?

Subject: how to solve "dereferencing pointer to incomplete type "?
From: "Bus Mini" <email@hidden>
Date: Fri, 5 May 2006 22:53:08 +0800
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Hello everyone,

I copied some code from QuickTime Compression and Decompression Guide, but it doesn't work, I don't how to recover it, can anyone help me?

    GWorldPtr           currWorld = nil;
    PixMapHandle        currPixMap;
    CGrafPtr             savedPort;
    GDHandle            savedDevice;

GetGWorld (&savedPort, &savedDevice);
imageRect = savedPort->portRect; //at this line XCode tell me "dereferencing pointer to incomplete type"

Thanks for reading my e-mail, your help is very important to me.

--
Yours sincerely
Mini Bus.

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