本文整理自网络,侵删。
function IsImageFile(const fn: string): Boolean;var extfn:String;begin extfn := LowerCase(ExtractFileExt(fn)); Result := (extfn = '.jpg') or (extfn = '.jpeg') or (extfn = '.gif') or (extfn = '.png') or (extfn = '.bmp');end;
function IsMovieFile(const fn: string): Boolean;var extfn:String;begin extfn := LowerCase(ExtractFileExt(fn)); Result := (extfn = '.rmvb') or (extfn = '.rm') or (extfn = '.mov') or (extfn = '.mkv') or (extfn = '.avi') or (extfn = '.flv');end;
function IsTxtFile(const fn: string): Boolean;var extfn:String;begin extfn := LowerCase(ExtractFileExt(fn)); Result := (extfn = '.txt') or (extfn = '.csv') or (extfn = '.cvs') or (extfn = '.scv');end;
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