delphi 相关问题

Delphi是一种通过使用Object Pascal快速开发本机Windows，macOS，Linux，iOS和Android应用程序的语言。该名称是指Delphi语言及其库，编译器和IDE，用于帮助编辑和调试Delphi项目。

Delphi - 如何获取目录中所有文件的列表

我正在使用delphi，当我执行openpicturedialog时，我想要一个目录中所有文件的列表。即，当执行打开对话框时并且我从中选择一个文件，我想要列表...

delphi opendialog

回答 6 投票 0

是否可以打开一个blob而不将其保存到文件

我的IDE是Delphi 10.3。我有一个 Firebird 2.5 表，附件字段类型是 Binary Blob。我可以打开此存储的文件（图像、word、excel、pdf、txt...）而不保存到磁盘吗？如果这不是

delphi firebird

回答 1 投票 0

Delphi (FMX)：Windows 中的 DCPCrypt2 在 Android/IOS 中产生不同的结果

我正在尝试编写一个函数，该函数在 Delphi (RAD Studio 10.2) 中返回与 PHP 中的以下代码相同的结果：我正在尝试编写一个在 Delphi (RAD Studio 10.2) 中返回与 PHP 中的以下代码相同的结果的函数： <?php $method = 'AES-256-CTR'; $data = 'Hello, world!'; $key = 'bRuD5WYw5wd0rdHR9yLlM6wt2vteuini'; $vector = 'bf49ea9d61104d8c'; $crypt = openssl_encrypt($data, $method, $key, 0, $vector); echo $crypt; ?> 我在 Pascal 中提出了这个函数（使用 David Barton 编写的 DCPcrypt v2.1 库）： procedure TMainForm.Encrypt1ButtonClick(Sender: TObject); var Cipher: TDCP_rijndael; Key, Vector: RawByteString; Data, Crypt: RawByteString; begin Data := 'Hello, world!'; SetLength(Crypt, Length(Data)); Key := 'bRuD5WYw5wd0rdHR9yLlM6wt2vteuini'; Vector := 'bf49ea9d61104d8c'; Cipher := TDCP_rijndael.Create(nil); try Cipher.Init(Key[1], 256, @Vector[1]); Cipher.EncryptCTR(Data[1], Crypt[1], Length(Data)); finally Cipher.Free; end; EncryptEdit.Text := DCPBase64.Base64EncodeStr(Crypt); end; 这确实有效（在 Windows 中）。 PHP 和 Pascal 都返回：pEP16OOxov9QDfraIg== 但是，如果我为 Android 编译相同的代码并在平板电脑上运行它，我会得到非常不同的结果。这是为什么？我确实阅读了有关转换 fmx 代码的文档，特别是处理字符串处理的内容，但我仍然不明白为什么。即使 RawByteString 是基于 0 而不是基于 1，我仍然会得到差异（尝试使用 [0] 而不是 [1]）。 RawByteString 没有附加代码页，对吧？所以这个问题不可能是由某些字符串转换引起的（我认为）。那么这是怎么回事？经过3天的努力，我终于成功了。关键是完全消除字符串的使用，并且仅使用 DCPCrypt 中基于 TByte 的例程。下面的代码是一个测试程序，用于测试 DCPCrypt 支持的所有不同链接模式。我还添加了一个函数来实现我在这里找到的四种填充模式（与 CBC 和 ECB 一起使用）： https://en.wikipedia.org/wiki/Padding_(密码学) 以及零填充和随机填充。我选择不使用 DCPCrypt 自己的 Base64 函数，因为它们与 FMX 不兼容。相反，我使用 System.NetEncoding 单元中的对应项。拜托，我认为自己只是一个普通的程序员，所以我希望你们当中真正的 Delphi 奇才能够找到很多可以批评的地方。但没关系。如果给出良好的反馈，我将调整代码。现在，代码可以运行并生成与 PHP 的 openssl 函数兼容的结果（使用 CTR 模式进行测试）。我只是在这里发布此内容，希望它对寻找与我相同的解决方案的人有用。 unit MainUnit; interface uses System.SysUtils, System.Types, System.UITypes, System.Classes, System.Variants, System.NetEncoding, FMX.Types, FMX.Controls, FMX.Forms, FMX.Graphics, FMX.Dialogs, FMX.StdCtrls, FMX.Layouts, FMX.ScrollBox, FMX.Memo, FMX.Edit, FMX.Controls.Presentation, DCPcrypt2, DCPsha256, DCPblockciphers, DCPrijndael; type TChainingMode = (cmCBC, cmCFB8bit, cmCFBblock, cmOFB, cmCTR, cmECB); TPaddingMode = (pmZeroPadding, pmANSIX923, pmISO10126, pmISO7816, pmPKCS7, pmRandomPadding); type TMainForm = class(TForm) ScrollBox: TScrollBox; KeySizeLabel: TLabel; ChainingLabel: TLabel; EncodingLabel: TLabel; PaddingLabel: TLabel; KeyLabel: TLabel; InitVectorLabel: TLabel; DataLabel: TLabel; DecryptedLabel: TLabel; CipherLabel: TLabel; EncryptedLabel: TLabel; rbRijndael: TRadioButton; rb128bit: TRadioButton; rb256bit: TRadioButton; rbANSI: TRadioButton; rbUTF8: TRadioButton; rbUnicode: TRadioButton; rbCBC: TRadioButton; rbOFB: TRadioButton; rbCTR: TRadioButton; rbECB: TRadioButton; rbCFB8bit: TRadioButton; rbCFBblock: TRadioButton; rbZeroPadding: TRadioButton; rbANSIX923: TRadioButton; rbISO10126: TRadioButton; rbISO7816: TRadioButton; rbPKCS7: TRadioButton; rbRandomPadding: TRadioButton; KeyEdit: TEdit; InitVectorEdit: TEdit; DataMemo: TMemo; EncryptedMemo: TMemo; DecryptedMemo: TMemo; EncryptButton: TButton; DecryptButton: TButton; procedure FormCreate(Sender: TObject); procedure EncryptButtonClick(Sender: TObject); procedure DecryptButtonClick(Sender: TObject); public procedure GetOptions(var Key: TBytes; var KeySize: integer; var InitVector: TBytes; var Encoding: TEncoding; var ChainingMode: TChainingMode; var PaddingMode: TPaddingMode); end; var MainForm: TMainForm; implementation {$R *.fmx} {$R *.LgXhdpiPh.fmx ANDROID} function BytesToHex(B: TBytes): string; var I: integer; begin Result := ''; for I := Low(B) to High(B) do Result := Result + IntToHex(B[I]) + ' '; end; procedure BytePadding(var Data: TBytes; BlockSize: integer; PaddingMode: TPaddingMode); // Supports: ANSI X.923, ISO 10126, ISO 7816, PKCS7, zero padding and random padding var I, DataBlocks, DataLength, PaddingStart, PaddingCount: integer; begin BlockSize := BlockSize div 8; // convert bits to bytes // Zero and Random padding do not use end-markers, so if Length(Data) is a multiple of BlockSize, no padding is needed if PaddingMode in [pmZeroPadding, pmRandomPadding] then if Length(Data) mod BlockSize = 0 then Exit; DataBlocks := (Length(Data) div BlockSize) + 1; DataLength := DataBlocks * BlockSize; PaddingCount := DataLength - Length(Data); // ANSIX923, ISO10126 and PKCS7 store the padding length in a 1 byte end-marker, so any padding length > $FF is not supported if PaddingMode in [pmANSIX923, pmISO10126, pmPKCS7] then if PaddingCount > $FF then Exit; PaddingStart := Length(Data); SetLength(Data, DataLength); case PaddingMode of pmZeroPadding, pmANSIX923, pmISO7816: // fill with $00 bytes FillChar(Data[PaddingStart], PaddingCount, 0); pmPKCS7: // fill with PaddingCount bytes FillChar(Data[PaddingStart], PaddingCount, PaddingCount); pmRandomPadding, pmISO10126: // fill with random bytes for I := PaddingStart to DataLength-1 do Data[I] := Random($FF); end; case PaddingMode of pmANSIX923, pmISO10126: Data[DataLength-1] := PaddingCount; // set end-marker with number of bytes added pmISO7816: Data[PaddingStart] := $80; // set fixed end-markder $80 end; end; procedure EncryptAES(const Data: TBytes; var Crypt: TBytes; const Key: TBytes; KeySize: integer; const InitVector: TBytes; ChainingMode: TChainingMode; PaddingMode: TPaddingMode); overload; var Cipher: TDCP_rijndael; begin Cipher := TDCP_rijndael.Create(nil); try Cipher.Init(Key[0], KeySize, @InitVector[0]); // Copy Data => Crypt Crypt := Copy(Data, 0, Length(Data)); // Padd Crypt to required length (for Block based algorithms) if ChainingMode in [cmCBC, cmECB] then BytePadding(Crypt, Cipher.BlockSize, PaddingMode); // Encrypt Crypt using the algorithm specified in ChainingMode case ChainingMode of cmCBC: Cipher.EncryptCBC(Crypt[0], Crypt[0], Length(Crypt)); cmCFB8bit: Cipher.EncryptCFB8bit(Crypt[0], Crypt[0], Length(Crypt)); cmCFBblock: Cipher.EncryptCFBblock(Crypt[0], Crypt[0], Length(Crypt)); cmOFB: Cipher.EncryptOFB(Crypt[0], Crypt[0], Length(Crypt)); cmCTR: Cipher.EncryptCTR(Crypt[0], Crypt[0], Length(Crypt)); cmECB: Cipher.EncryptECB(Crypt[0], Crypt[0]); end; finally Cipher.Free; end; end; procedure DecryptAES(const Crypt: TBytes; var Data: TBytes; const Key: TBytes; KeySize: integer; const InitVector: TBytes; ChainingMode: TChainingMode; PaddingMode: TPaddingMode); overload; var Cipher: TDCP_rijndael; I: integer; begin Cipher := TDCP_rijndael.Create(nil); try Cipher.Init(Key[0], KeySize, @InitVector[0]); // Copy Crypt => Data Data := Copy(Crypt, 0, Length(Crypt)); // Decrypt Data using the algorithm specified in ChainingMode case ChainingMode of cmCBC: Cipher.DecryptCBC(Data[0], Data[0], Length(Data)); cmCFB8bit: Cipher.DecryptCFB8bit(Data[0], Data[0], Length(Data)); cmCFBblock: Cipher.DecryptCFBblock(Data[0], Data[0], Length(Data)); cmOFB: Cipher.DecryptOFB(Data[0], Data[0], Length(Data)); cmCTR: Cipher.DecryptCTR(Data[0], Data[0], Length(Data)); cmECB: Cipher.DecryptECB(Data[0], Data[0]); end; // Correct the length of Data, based on the used PaddingMode (only for Block based algorithms) if ChainingMode in [cmCBC, cmECB] then case PaddingMode of pmANSIX923, pmISO10126, pmPKCS7: // these modes store the original Padding count in the last byte SetLength(Data, Length(Data) - Data[Length(Data)-1]); pmISO7816: // this mode uses a fixed end-marker. Find it and correct length accordingly. for I := Length(Data)-1 downto 0 do if Data[I] = $80 then begin SetLength(Data, I); Break; end; end; finally Cipher.Free; end; end; procedure TMainForm.FormCreate(Sender: TObject); begin EncryptedMemo.Lines.Clear; DecryptedMemo.Lines.Clear; end; procedure TMainForm.GetOptions(var Key: TBytes; var KeySize: integer; var InitVector: TBytes; var Encoding: TEncoding; var ChainingMode: TChainingMode; var PaddingMode: TPaddingMode); begin KeySize := 256; Encoding := TEncoding.ANSI; ChainingMode := cmCBC; PaddingMode := pmPKCS7; if rb128bit.IsChecked then KeySize := 128; if rb256bit.IsChecked then KeySize := 256; if rbCBC.IsChecked then ChainingMode := cmCBC; if rbCFB8bit.IsChecked then ChainingMode := cmCFB8bit; if rbCFBblock.IsChecked then ChainingMode := cmCFBblock; if rbOFB.IsChecked then ChainingMode := cmOFB; if rbCTR.IsChecked then ChainingMode := cmCTR; if rbECB.IsChecked then ChainingMode := cmECB; if rbZeroPadding.IsChecked then PaddingMode := pmZeroPadding; if rbANSIX923.IsChecked then PaddingMode := pmANSIX923; if rbISO10126.IsChecked then PaddingMode := pmISO10126; if rbISO7816.IsChecked then PaddingMode := pmISO7816; if rbPKCS7.IsChecked then PaddingMode := pmPKCS7; if rbRandomPadding.IsChecked then PaddingMode := pmRandomPadding; if rbANSI.IsChecked then Encoding := TEncoding.ANSI; if rbUTF8.IsChecked then Encoding := TEncoding.UTF8; if rbUnicode.IsChecked then Encoding := TEncoding.Unicode; Key := Encoding.GetBytes(KeyEdit.Text); InitVector := Encoding.GetBytes(InitVectorEdit.Text); end; procedure TMainForm.EncryptButtonClick(Sender: TObject); var Keysize: integer; Encoding: TEncoding; ChainingMode: TChainingMode; PaddingMode: TPaddingMode; Key, InitVector, Data, Crypt: TBytes; begin GetOptions(Key, KeySize, InitVector, Encoding, ChainingMode, PaddingMode); Data := Encoding.GetBytes(DataMemo.Text); EncryptAES(Data, Crypt, Key, KeySize, InitVector, ChainingMode, PaddingMode); EncryptedMemo.Text := TNetEncoding.Base64.EncodeBytesToString(Crypt); end; procedure TMainForm.DecryptButtonClick(Sender: TObject); var Keysize: integer; Encoding: TEncoding; ChainingMode: TChainingMode; PaddingMode: TPaddingMode; Key, InitVector, Data, Crypt: TBytes; begin GetOptions(Key, KeySize, InitVector, Encoding, ChainingMode, PaddingMode); Crypt := TNetEncoding.Base64.DecodeStringToBytes(EncryptedMemo.Text); DecryptAES(Crypt, Data, Key, KeySize, InitVector, ChainingMode, PaddingMode); DecryptedMemo.Text := Encoding.GetString(Data); end; end. Android 字符串从位置 0 开始。您可以使用 low(Data) 返回字符串的第一个字符，库内部也使用从位置 1 开始的字符串，这不会在 android 或 ios 中运行。对于多平台，我们不应该使用 for i:=1 to length(string) 而应该使用 for l in string 我认为LockBox3应该可以解决你的问题。我在这里面临着同样的问题，并且想运行您测试应用程序。能提供一下fmx表格的源码吗？非常感谢！

php delphi encryption openssl rawbytestring

回答 3 投票 0

如何使用 Delphi 将各种文档类型添加到 Firebird BLOB 字段

背景：我们的产品包括一个文档管理系统，允许用户保存和检索各种文档类型（.PDF、.DOC、.JPG、.PNG、.TIF 等）。目前

delphi blob firebird document

回答 1 投票 0

使用 mongo-delphi-driver 获取具有特定 _id 的文档

我必须在mongodb上执行查询，我想仅选择具有特定_id（类型ObjectId）的文档。我使用“严格模式”语法，特别是运算符 $oid 将 _id 与

mongodb delphi mongo-c-driver

回答 4 投票 0

德尔福和Doxygen

我想使用 doxygen + pas2dox 记录我的源代码。当我设置好所有内容（包括过滤器和提取选项（提取所有内容））时，doxygen 运行良好。但是生成的文档...