Delphi - 尝试获取异常的 StackTrace
Delphi - Trying to get StackTrace for an exception
我有一个异常记录器,可以将所有异常记录到日志文件中:
class function TLogger.LogException (ACaller: String; E: Exception): Boolean;
var
LogFilename, tmp: string;
LogFile: TextFile;
appsettings: TApplicationSettings;
begin
// prepare log file
appsettings:=TApplicationSettings.Create;
try
tmp:=appsettings.ErrorLogsLocation;
finally
FreeAndNil(appsettings);
end;
if NOT (DirectoryExists(tmp)) then
CreateDir(tmp);
//We create a new log file for every day to help with file size issues
LogFilename:=IncludeTrailingPathDelimiter (tmp) + 'LJErrors_' + FormatDateTime('yyyy-mm-dd', Now) +'.log';
try
AssignFile (LogFile, LogFilename);
if FileExists (LogFilename) then
Append (LogFile) // open existing file
else
Rewrite (LogFile); // create a new one
// write to the file and show error
Writeln(LogFile, CRLF+CRLF);
Writeln (LogFile, 'Application Path: ' + ExtractFilePath(ParamStr (0)));
Writeln (LogFile, 'Application Version: ' + TUtility.GetAppVersionString);
Writeln (LogFile, 'Operating System: ' + TUtility.GetOSInfo);
Writeln (LogFile, 'Error occurred at: ' + FormatDateTime ('dd-mmm-yyyy hh:nn:ss AM/PM', Now));
Writeln (LogFile, 'Logged By: ' + ACaller);
Writeln (LogFile, 'Unit Name: ' + E.UnitName);
Writeln (LogFile, 'Error Message: ' + E.Message);
Writeln (LogFile, 'Error Class: ' + E.ClassName);
Writeln (LogFile, 'Base Exception Error: ' + E.BaseException.Message);
Writeln (LogFile, 'Base Exception Class: ' + E.BaseException.ClassName);
Writeln (LogFile, 'Stack Trace: ' + E.StackTrace);
Result:=True;
finally
// close the file
CloseFile (LogFile);
end;
end;
为了启用 Exception.StackTrace
,我正在使用中概述的 JCLDebug:https://blog.gurock.com/working-with-delphis-new-exception-stacktrace。
unit StackTrace;
interface
uses
SysUtils, Classes, JclDebug;
implementation
function GetExceptionStackInfoProc(P: PExceptionRecord): Pointer;
var
LLines: TStringList;
LText: String;
LResult: PChar;
begin
LLines := TStringList.Create;
try
JclLastExceptStackListToStrings(LLines, True, True, True, True);
LText := LLines.Text;
LResult := StrAlloc(Length(LText));
StrCopy(LResult, PChar(LText));
Result := LResult;
finally
LLines.Free;
end;
end;
function GetStackInfoStringProc(Info: Pointer): string;
begin
Result := string(PChar(Info));
end;
procedure CleanUpStackInfoProc(Info: Pointer);
begin
StrDispose(PChar(Info));
end;
initialization
// Start the Jcl exception tracking and register our Exception
// stack trace provider.
if JclStartExceptionTracking then
begin
Exception.GetExceptionStackInfoProc := GetExceptionStackInfoProc;
Exception.GetStackInfoStringProc := GetStackInfoStringProc;
Exception.CleanUpStackInfoProc := CleanUpStackInfoProc;
end;
finalization
// Stop Jcl exception tracking and unregister our provider.
if JclExceptionTrackingActive then
begin
Exception.GetExceptionStackInfoProc := nil;
Exception.GetStackInfoStringProc := nil;
Exception.CleanUpStackInfoProc := nil;
JclStopExceptionTracking;
end;
end.
我在项目选项中启用了以下选项:
编译:调试信息,本地符号,符号参考信息,使用调试.dcus,使用导入数据参考
链接:调试信息
然而,当我触发异常时,即使 GetExceptionStackInfoProc
被触发,Exception.StackInfo
始终是一个空字符串。关于我可能遗漏了什么有什么想法吗?
更新 20170504: 感谢 Stefan Glienke 提供的解决方案。为了完整起见,我在此处包含了包含他的解决方案的已更改 GetExceptionStackInfoProc
过程的代码:
function GetExceptionStackInfoProc(P: PExceptionRecord): Pointer;
var
LLines: TStringList;
LText: String;
LResult: PChar;
jcl_sil: TJclStackInfoList;
begin
LLines := TStringList.Create;
try
jcl_sil:=TJclStackInfoList.Create(True, 7, p.ExceptAddr, False, nil, nil);
try
jcl_sil.AddToStrings(LLines, true, true, true, true);
finally
FreeAndNil(jcl_sil);
end;
LText := LLines.Text;
LResult := StrAlloc(Length(LText));
StrCopy(LResult, PChar(LText));
Result := LResult;
finally
LLines.Free;
end;
end;
您需要自己创建它(并释放它):
TJclStackInfoList.Create(True, 7, p.ExceptAddr, False, nil, nil);
在该实例中,您可以调用 AddToStrings
。
有关详细信息,请查看 JclDebug.GetExceptionStackInfo
。 AIgnoreLevels 的值取自那里,但在我的测试中,我总是有一个条目太多,所以我将它增加了一个。
下面是我从调用 RaiseLastOSError 的 Button1 应用程序中获得的片段;
[0042BFE5] System.SysUtils.Sysutils.RaiseLastOSError$qqrix20System.UnicodeString (Line 24937, "System.SysUtils.pas")
[0042BF5B] System.SysUtils.Sysutils.RaiseLastOSError$qqrv (Line 24919, "System.SysUtils.pas")
[005CD004] Unit85.TForm85.Button1Click$qqrp14System.TObject (Line 28, "Unit85.pas")
[0051D567] Vcl.Controls.TControl.Click$qqrv (Line 7429, "Vcl.Controls.pas")
[00534CDA] Vcl.StdCtrls.Stdctrls.TCustomButton.Click$qqrv (Line 5434, "Vcl.StdCtrls.pas")
如果你真正阅读JclDebug unit,你会看到初始化和完成部分有注册和注销代码,所以只需将单元放入使用部分就足够了。 (参见 SetupExceptionProcs
)
我有一个异常记录器,可以将所有异常记录到日志文件中:
class function TLogger.LogException (ACaller: String; E: Exception): Boolean;
var
LogFilename, tmp: string;
LogFile: TextFile;
appsettings: TApplicationSettings;
begin
// prepare log file
appsettings:=TApplicationSettings.Create;
try
tmp:=appsettings.ErrorLogsLocation;
finally
FreeAndNil(appsettings);
end;
if NOT (DirectoryExists(tmp)) then
CreateDir(tmp);
//We create a new log file for every day to help with file size issues
LogFilename:=IncludeTrailingPathDelimiter (tmp) + 'LJErrors_' + FormatDateTime('yyyy-mm-dd', Now) +'.log';
try
AssignFile (LogFile, LogFilename);
if FileExists (LogFilename) then
Append (LogFile) // open existing file
else
Rewrite (LogFile); // create a new one
// write to the file and show error
Writeln(LogFile, CRLF+CRLF);
Writeln (LogFile, 'Application Path: ' + ExtractFilePath(ParamStr (0)));
Writeln (LogFile, 'Application Version: ' + TUtility.GetAppVersionString);
Writeln (LogFile, 'Operating System: ' + TUtility.GetOSInfo);
Writeln (LogFile, 'Error occurred at: ' + FormatDateTime ('dd-mmm-yyyy hh:nn:ss AM/PM', Now));
Writeln (LogFile, 'Logged By: ' + ACaller);
Writeln (LogFile, 'Unit Name: ' + E.UnitName);
Writeln (LogFile, 'Error Message: ' + E.Message);
Writeln (LogFile, 'Error Class: ' + E.ClassName);
Writeln (LogFile, 'Base Exception Error: ' + E.BaseException.Message);
Writeln (LogFile, 'Base Exception Class: ' + E.BaseException.ClassName);
Writeln (LogFile, 'Stack Trace: ' + E.StackTrace);
Result:=True;
finally
// close the file
CloseFile (LogFile);
end;
end;
为了启用 Exception.StackTrace
,我正在使用中概述的 JCLDebug:https://blog.gurock.com/working-with-delphis-new-exception-stacktrace。
unit StackTrace;
interface
uses
SysUtils, Classes, JclDebug;
implementation
function GetExceptionStackInfoProc(P: PExceptionRecord): Pointer;
var
LLines: TStringList;
LText: String;
LResult: PChar;
begin
LLines := TStringList.Create;
try
JclLastExceptStackListToStrings(LLines, True, True, True, True);
LText := LLines.Text;
LResult := StrAlloc(Length(LText));
StrCopy(LResult, PChar(LText));
Result := LResult;
finally
LLines.Free;
end;
end;
function GetStackInfoStringProc(Info: Pointer): string;
begin
Result := string(PChar(Info));
end;
procedure CleanUpStackInfoProc(Info: Pointer);
begin
StrDispose(PChar(Info));
end;
initialization
// Start the Jcl exception tracking and register our Exception
// stack trace provider.
if JclStartExceptionTracking then
begin
Exception.GetExceptionStackInfoProc := GetExceptionStackInfoProc;
Exception.GetStackInfoStringProc := GetStackInfoStringProc;
Exception.CleanUpStackInfoProc := CleanUpStackInfoProc;
end;
finalization
// Stop Jcl exception tracking and unregister our provider.
if JclExceptionTrackingActive then
begin
Exception.GetExceptionStackInfoProc := nil;
Exception.GetStackInfoStringProc := nil;
Exception.CleanUpStackInfoProc := nil;
JclStopExceptionTracking;
end;
end.
我在项目选项中启用了以下选项:
编译:调试信息,本地符号,符号参考信息,使用调试.dcus,使用导入数据参考
链接:调试信息
然而,当我触发异常时,即使 GetExceptionStackInfoProc
被触发,Exception.StackInfo
始终是一个空字符串。关于我可能遗漏了什么有什么想法吗?
更新 20170504: 感谢 Stefan Glienke 提供的解决方案。为了完整起见,我在此处包含了包含他的解决方案的已更改 GetExceptionStackInfoProc
过程的代码:
function GetExceptionStackInfoProc(P: PExceptionRecord): Pointer;
var
LLines: TStringList;
LText: String;
LResult: PChar;
jcl_sil: TJclStackInfoList;
begin
LLines := TStringList.Create;
try
jcl_sil:=TJclStackInfoList.Create(True, 7, p.ExceptAddr, False, nil, nil);
try
jcl_sil.AddToStrings(LLines, true, true, true, true);
finally
FreeAndNil(jcl_sil);
end;
LText := LLines.Text;
LResult := StrAlloc(Length(LText));
StrCopy(LResult, PChar(LText));
Result := LResult;
finally
LLines.Free;
end;
end;
您需要自己创建它(并释放它):
TJclStackInfoList.Create(True, 7, p.ExceptAddr, False, nil, nil);
在该实例中,您可以调用 AddToStrings
。
有关详细信息,请查看 JclDebug.GetExceptionStackInfo
。 AIgnoreLevels 的值取自那里,但在我的测试中,我总是有一个条目太多,所以我将它增加了一个。
下面是我从调用 RaiseLastOSError 的 Button1 应用程序中获得的片段;
[0042BFE5] System.SysUtils.Sysutils.RaiseLastOSError$qqrix20System.UnicodeString (Line 24937, "System.SysUtils.pas")
[0042BF5B] System.SysUtils.Sysutils.RaiseLastOSError$qqrv (Line 24919, "System.SysUtils.pas")
[005CD004] Unit85.TForm85.Button1Click$qqrp14System.TObject (Line 28, "Unit85.pas")
[0051D567] Vcl.Controls.TControl.Click$qqrv (Line 7429, "Vcl.Controls.pas")
[00534CDA] Vcl.StdCtrls.Stdctrls.TCustomButton.Click$qqrv (Line 5434, "Vcl.StdCtrls.pas")
如果你真正阅读JclDebug unit,你会看到初始化和完成部分有注册和注销代码,所以只需将单元放入使用部分就足够了。 (参见 SetupExceptionProcs
)