phpimagick库处理pdf有关问题

php imagick库处理pdf问题
Fatal error: Uncaught exception 'ImagickException' with message 'unable to open image `papers/1375680721.pdf': No such file or directory @ error/blob.c/OpenBlob/2622' in C:\xampp\htdocs\fc\editpaper.php:38 Stack trace: #0
C:\xampp\htdocs\fc\editpaper.php(38): Imagick->readimage('papers/13756807...') #1 C:\xampp\htdocs\fc\editpaper.php(108): pdf2png('papers/13756807...', 'papers/', 0) #2 C:\xampp\htdocs\fc\editpaper.php(211): anli->insert('') #3 {main} thrown in C:\xampp\htdocs\fc\editpaper.php on line 38

报如下错误

function pdf2png($PDF,$toPath,$page){   

	if(!extension_loaded('imagick')){

		echo "imagick";

		return false;   

	}   

	if(!file_exists($PDF)){

		echo "noexists";

		return false;   

	}

	$IM = new imagick();   

	$IM->setResolution(1000,2000);   

	$IM->setCompressionQuality(100);   

	$IM->readImage($PDF."[".$page."]");

	foreach ($IM as $Key => $Var){

		$Var->setImageFormat('png');       

		$Filename = $toPath.time().'_'.$Key.'.png';       

		if($Var->writeImage($Filename) == true){           

			$Return[] = $Filename;       

		}

	}

	return $Return;

}

PHP

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------解决方案--------------------
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