huiyadanli/RevokeMsgPatcher · warning · BusinessException

installed

installed

Error message

你已经安装过此补丁！

What it means

In ValidateAndFindModifyInfo (the precise/SHA1 patch path), the file's SHA1 matched a ModifyInfo.SHA1After (the hash of an already-patched file). AppModifier throws BusinessException('installed') because the file has already been patched and there is nothing to do.

Source

Thrown at RevokeMsgPatcher/Modifier/AppModifier.cs:337

                                matchingVersion = modifyInfo;
                            }
                        }
                    }
                }


                // 补丁前SHA1匹配上，肯定是正确的dll
                if (matchingSHA1Before != null)
                {
                    editor.FileModifyInfo = matchingSHA1Before;
                    editor.TargetChanges = matchingSHA1Before.Changes;
                    continue;
                }

                // 补丁后SHA1匹配上，肯定已经打过补丁
                if (matchingSHA1After != null)
                {
                    throw new BusinessException("installed", $"你已经安装过此补丁！");
                }

                // SHA1不匹配说明精准替换肯定不支持
                if (matchingSHA1Before == null && matchingSHA1After == null)
                {
                    // 尝试使用特征码替换
                    // 多个版本范围，匹配出对应版本可以使用的特征
                    if (config.FileCommonModifyInfos != null)
                    {
                        editor.FileCommonModifyInfo = FindCommonModifyInfo(editor);
                    }

                    // 存在对应的特征时不报错
                    if (editor.FileCommonModifyInfo != null && editor.FileCommonModifyInfo.ReplacePatterns != null)
                    {
                        List<ReplacePattern> replacePatterns = editor.FileCommonModifyInfo.ReplacePatterns;
                        // 根据需要操作的功能类型（防撤回或者多开等）筛选特征码
                        if (categories != null && categories.Count > 0)

View on GitHub (pinned to 89cbbb3f0c)

Solutions

  1. Restore the original DLL first (the tool copies the .h.bak back).
  2. If no backup exists, obtain a clean DLL of that version.
Defensive patterns

Strategy: try-catch

Type guard

static bool IsBusinessException(Exception e, string code) => e is BusinessException b && b.ErrorCode == code;

static bool IsInstalled(Exception e) => IsBusinessException(e, "installed");

Try / catch

try
{
    modifier.ValidateAndFindModifyInfo(categories);
}
catch (BusinessException ex) when (ex.ErrorCode == "installed")
{
    // SHA1After matched: already patched. Offer Restore instead.
    MessageBox.Show("你已经安装过此补丁，如需重装请先还原。");
}

Prevention

When it happens

Trigger: Running the precise (SHA1-based) patch on a DLL whose hash equals the post-patch hash for that version: the patch was already applied previously.

Common situations: User re-runs the patch without restoring; patch was applied in a prior session.

Related errors

AI-assisted analysis of huiyadanli/RevokeMsgPatcher@89cbbb3f0c (2026-08-13). Data as JSON: /api/errors/ca4c8169e092159c. Report an issue: GitHub.