如何在程序执行的最开始设置断点

问题描述

如何在加载任何链接的 DLL 之前停止程序?

我尝试在 Break At Function 调试选项中设置 LoadLibraryExW 函数，它在该函数处停止，但在此之前，我在 Visual Studio 输出中有以下内容窗户:

那么如何在加载 ntdll.dll 之前停止调试器中的程序?好的，不是在加载之前，而是在执行任何 DllMain 函数之前和初始化任何静态对象之前.

您可以通过将注册表项添加到图像文件执行选项"并使用您的 exe 名称来实现.添加名为Debugger"的字符串类型值并将其设置为 vsjitdebugger.exe 以启动即时调试器对话框.然后，您可以选择一种可用的调试器，包括 Visual Studio.此对话框在 Windows 加载 EXE 之后，在任何代码开始运行之前立即触发.

这是在您启动 notepad.exe 时触发对话框的示例 .reg 文件.将密钥名称修改为您的 .exe:

REGEDIT4[HKEY_LOCAL_MACHINESOFTWAREMicrosoftWindows NTCurrentVersionImage File Execution Options
otepad.exe]"调试器"="vsjitdebugger.exe"

How can I stop the program before loading any of the linked DLLs?

I've tried to set LoadLibraryExW function in the Break At Function debugging option and it stops at that function, but before that I have the following in Visual Studio output windows:

'test.exe': Loaded 'C:WindowsSystem32
tdll.dll', Symbols loaded (source information stripped).
'test.exe': Loaded 'C:WindowsSystem32kernel32.dll', Symbols loaded (source information stripped).
'test.exe': Loaded 'C:WindowsSystem32KernelBase.dll', Symbols loaded (source information stripped).
'test.exe': Loaded 'C:WindowsSystem32uxtheme.dll', Symbols loaded (source information stripped).
'test.exe': Loaded 'C:WindowsSystem32msvcrt.dll', Symbols loaded (source information stripped).
---- plus about 30 DLLs ---

So how can I stop the program in the debugger before loading the ntdll.dll? Ok, not before loading, but before executing any of DllMain functions and before initializing any of static objects.

You can do this by adding a registry key to "Image File Execution Options" with the name of your exe. Add a value of type string named "Debugger" and set it to vsjitdebugger.exe to launch the just-in-time debugger dialog. Which then lets you pick one of the available debuggers, including Visual Studio. This dialog is triggered right after Windows has loaded the EXE, before any code starts running.

Here's is a sample .reg file that triggers the dialog when you start notepad.exe. Modify the key name to your .exe:

REGEDIT4

[HKEY_LOCAL_MACHINESOFTWAREMicrosoftWindows NTCurrentVersionImage File Execution Options
otepad.exe]
"Debugger"="vsjitdebugger.exe"

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