uses SysUtils; function FileExistsCheck(const FileName: string): Boolean; begin Result := FileExists(FileName); end; begin try // 测试一个存在的文件 if FileExistsCheck('C:\path\to\existing\file.txt') then Writeln('File
if not FileExists(fName) then exit; //如果文件不存在则退出 HFileRes := CreateFile(pchar(fName), GENERIC_READ or GENERIC_WRITE, 0 {this is the trick!}, nil, OPEN_EXISTING, FILE_ATTRIBUTE_NORMAL, 0); Result := (HFileRes = INVALID_HANDLE_VALUE); //如果CreateFile返回失败 那么Result...
问Delphi XE2中的不满意依赖异常EN因为异常大大地降低性能，所以您不应该将它们用作控制正常程序流程的方...
This method displays the open file dialog box. If the user OKs we check if the provided file exists. If so we display it in the web browser and show its source code in the memo control. If the file doesn't exist we navigate toabout:blankand display that text in the memo. Recompile...
if not DirectoryExists(ExtractFilePath(LogFile)) then CreateDir(ExtractFilePath(LogFile)); if FileExists(LogFile) then FileStream := TFileStream.Create(LogFile, fmOpenWrite or fmShareDenyNone) else FileStream:=TFileStream.Create(LogFile,fmCreate or fmShareDenyNone); ...
if fileName = '' then Exit; if not FileExists(fileName) then Exit; MyFile:=TMemoryStream.Create;//创建流 MyFile.LoadFromFile(fileName);//把流入口映射到MyFile对象 size:=MyFile.Size; pc:=MyFile.Memory; //把字符指针指向内存流 curIndex:=RowLeast; ...
function CheckHidden(const FileName: string): Boolean;var FileRec: TSearchrec;begin Result := False;if (not FileExists(FileName)) and (not DirectoryExists(FileName)) then begin Result := False;Exit;end;SysUtils.FindFirst(FileName, faAnyfile, FileRec);if (FileRec.Attr and fa...
if (CheckInput) then begin HttpReq := CoXMLHTTPRequest.Create; //两种提交请求的方式:Get和Post,Get是通过URL地址传递参数如果是中文需要转码,需要添加时间戳 Post不需要添加时间戳 //get url := 'http://localhost:5269/api/webmemberapi/NewMemberRegister?timestamp='+inttostr(Windows.GetTickCount); ...
《delphi学习园地》之 函数介绍(六)首部functionTerminateExtension(dwFlags:DWORD):Bool;$[ISAPIApp 功能返回HTTP的申请是否准备好。 说明 首部functionTextToFloat(Buffer:PChar;varValue;ValueType:TFloatValue):Boolean;$[SysUtils 功能将字符串转换为浮点数。 说明以null结束的格式。 首部functionTextToShortCut(...
问如何在Delphi中正确使用IFileOperation删除文件夹中的文件EN我试图创建一个简单的示例，使用IFileOperation...