WinDbg:对 .if 中的条件使用命令 [英] WinDbg: using commands for the condition in .if

问题描述

WinDbg 具有用于条件执行命令的 .if 语句:

WinDbg has the .if statement for conditional execution of commands:

   .if (Condition) { Commands } .else { Commands } 

对于条件，不能使用 WinDbg 命令.是否有任何间接方式使用条件命令，例如通过伪寄存器?

For Condition, it's not possible to use WinDbg commands. Is there any indirect way of using commands for the condition, e.g. through pseudo registers?

要完成的示例任务:如果已打开日志文件，则不执行任何操作.如果没有打开日志文件，请使用 .logopen/t/u/d

Example task to accomplish: If a logfile is already opened, do nothing. If no logfile is open, use .logopen /t /u /d

使用 .logfile，我可以找出日志是否打开.但是如何解析该输出以及如何将结果分配给伪寄存器?

With .logfile, I can find out whether a log is open or not. But how to parse that output and how to assign the result to a pseudo register?

也欢迎任何其他没有伪寄存器的方式.

Any other way without pseudo registers is also welcome.

由于该示例似乎不是很有用，请考虑以下可以通过脚本或 .cmdtree 窗口自动执行的任务:

As the example may not seem very useful, consider the following tasks which can be automated by scripting or the .cmdtree window:

• 加载正确版本的 SOS，例如.if (lm m clr == clr) { .loadby sos clr } .elseif (lm m mscorwks == mscorwks) {.loadby sos mscorwks}
• 我总是忘记做的事情，例如.if (| == myprocess) {.childdbg 1;.sympath+ mydir}

推荐答案

我对此进行了测试，如果在模块列表中找到 clr，它会加载正确的 sos.dll:.foreach (module {lm1m} ) { .if ($sicmp("${module}","clr") == 0) {.echo FOUND ${module};.loadby sos.dll clr} }

I tested this and it loads the correct sos.dll if it finds clr in the list of modules: .foreach (module {lm1m} ) { .if ($sicmp("${module}","clr") == 0) {.echo FOUND ${module}; .loadby sos.dll clr} }

您可以使用 .elsif 轻松扩展它，并将模块与mscorwks"进行比较.

You can easily extend it using .elsif and comparing module with "mscorwks".

至于检查您的进程，我附加到 calc.exe 并运行 |，它给了我:.0 id: 6bc 附加名称: C:\Windows\system32\calc.exe

As for checking for your process, I attached to calc.exe and ran | which gives me: . 0 id: 6bc attach name: C:\Windows\system32\calc.exe

我只想要最后一个标记，所以我可以通过将/pS 6 指定为 .foreach 来跳过前六个.以下对 *calc.exe 使用通配符比较，如果找到，则告诉调试器调试子进程:

I only want the last token so I can skip the first six by specifying /pS 6 to .foreach. The following uses a wildcard comparison for *calc.exe and if found, tells the debugger to debug child processes:

.foreach/pS 6 (token {|}) {.echo ${token};.if($spat("${token}","*calc.exe") == 1) {.echo 找到我的应用程序；.childdbg 1} .else {.echo 找不到我的应用程序} }

也经过测试和工作.

ps.我的调试器版本是 6.2.8400.0

ps. my debugger version is 6.2.8400.0

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