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C# 防止密碼偵測(竊取/偷窺/透視)工具[spy++]的TextBox元件『myPassBox』(CS_Protect_the_Password_inside_a_TextBox) 資料來源:https://dotblogs.com.tw/ricochen/2009/12/16/12485 https://codingvision.net/security/c-protect-the-password-inside-a-textbox 微軟工具:C:\Program Files (x86)\Microsoft Visual Studio 14.0\Common7\Tools\spyxx.exe 外部工具:xkvp_4.5.20090205_azo 實際運用截圖 GITHUB:https://github.com/jash-git/CS_Protect_the_Password_inside_a_TextBox code: using System; using System.Collections.Generic; using System.Linq; using System.Text; using System.Threading.Tasks; using System.Windows.Forms; namespace WindowsFormsApplication1 { public class myPassBox : TextBox { // the malicious message, that needs to be handled private const int WM_GETTEXT = 0x000D; // 'true' if the messages are sent from our program (from Text property) // 'false' if they're sent by anything else bool allowAccess { get; set; } public override string Text // overriding Text property { get { allowAccess = true; // allow WM_GETTEXT (because it's an internal call) return base.Text; //this sends the message above in order to retrieve the TextBox's value } set { base.Text = value; } } protected override void WndProc(ref Message m) { if (m.Msg == WM_GETTEXT) // if the message is WM_GETTEXT { if (allowAccess) // and it comes from the Text property { allowAccess = false; //we temporarily remove the access base.WndProc(ref m); //and finally, process the message } } else base.WndProc(ref m); } } }