BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  Dynamic image loading          BorlandTalk.com Forum Index -> Delphi Thirdparty Tools (General) View previous topic :: View next topic   Author Message Ray Mond Guest Posted: Thu May 10, 2007 3:37 pm    Post subject: Dynamic image loading I have a database table which contains an image (blob) column. Is there a component that I can use, which I can load the blob (or data stream) into, and the component can then figure out the type of image (bmp, jpg, gif, png), and display the image accordingly? I do not want to have to 'tell' the component the type of image that's stored, because I don't have that information. Thanks. Ray Mond Back to top Torry Guest Posted: Thu May 10, 2007 3:52 pm    Post subject: Re: Dynamic image loading Quote: I have a database table which contains an image (blob) column. Is there a component that I can use, which I can load the blob (or data stream) into, and the component can then figure out the type of image (bmp, jpg, gif, png), and display the image accordingly? I do not want to have to 'tell' the component the type of image that's stored, because I don't have that information. At least two products of Microolap contains free component for JPEG images - TDBImageEx. Products are PostgresDAC (for PostreSQL - http://www.microolap.com/products/connectivity/postgresdac/) and DAC for MySQL (for MySQL - http://www.microolap.com/products/connectivity/mysqldac/) I think that it can be partially rewritten to support the other formats as well. -- Best regards Maxim Peresada Torry's Delphi Pages http://www.torry.net Back to top Dean Hill Guest Posted: Fri May 11, 2007 12:30 am    Post subject: Re: Dynamic image loading Ray Mond wrote: Quote: I have a database table which contains an image (blob) column. Is there a component that I can use, which I can load the blob (or data stream) into, and the component can then figure out the type of image (bmp, jpg, gif, png), and display the image accordingly? I do not want to have to 'tell' the component the type of image that's stored, because I don't have that information. ImageEn from Hi-Components will do this (http://www.hicomponents.com) with their LoadFromStream method on the ImageEnIO component. -- Dean Back to top Martijn Tonies Guest Posted: Fri May 11, 2007 8:13 am    Post subject: Re: Dynamic image loading Quote: I have a database table which contains an image (blob) column. Is there a component that I can use, which I can load the blob (or data stream) into, and the component can then figure out the type of image (bmp, jpg, gif, png), and display the image accordingly? I do not want to have to 'tell' the component the type of image that's stored, because I don't have that information. Ray, You can show these types (and others) in a TImage. But if you do not know the type of the image, you need to figure it out yourself. I've done this for the BLOB Editor in Database Workbench and it's fairly easy to do. Search for "magic numbers file formats" in Google and you'll get a hint of how to do it. Basically, you check the first few bytes and try to detect the file type from that. -- Martijn Tonies Database Workbench - tool for InterBase, Firebird, MySQL, NexusDB, Oracle & MS SQL Server Upscene Productions http://www.upscene.com My thoughts: http://blog.upscene.com/martijn/ Database development questions? Check the forum! http://www.databasedevelopmentforum.com Back to top Ray Mond Guest Posted: Tue May 15, 2007 8:13 am    Post subject: Re: Dynamic image loading Thanks, everyone, for the suggestions. 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