无法在C ++中读取注册表项 [英] Cannot read Registry entry in C++

问题描述

我有一个注册表项，我似乎无法在C ++中读取，但它显示在 Regedit 。

使用以下C ++代码段：

  openResult = RegOpenKeyEx（HKEY_LOCAL_MACHINE，_TEXT（SOFTWARE\\ Microsoft \ \ NET Framework Setup\\NDP\\v4\\Full），0，KEY_READ和& root）; 
 readResult1 = RegQueryValueEx（root，_TEXT（InstallPath），NULL，NULL，data1，& size）; 
 readResult2 = RegQueryValueEx（root，_TEXT（fake_entry），NULL，NULL，data2，& size）; 
  

我收到错误2， ERROR_FILE_NOT_FOUND 第二个 RegQueryValueEx（）调用。

如下图所示， fake_entry 。

我通过 Regedit 创建了此条目。

Microsoft的。

是，我阅读了此问题。

是，我尝试在阅读 fake_entry SOFTWARE \\ Wow6432Node \\Microsoft \\NET Framework Setup \\NDP\\v4\\Full 有相同的错误。

在Visual Studio 2010中使用ASCII字符编码运行Windows 7，64位，C ++。





我误解了注册表重定向器？
我的代码有问题吗？
在注册表的某些部分是否有某种权限设置？我明显缺少一些东西。

解决方案

尝试

  openResult = RegOpenKeyEx（HKEY_LOCAL_MACHINE，_TEXT（SOFTWARE\\Microsoft\\NET Framework Setup\\\\\\\\\\Full），0， KEY_READ | KEY_WOW64_64KEY，& root）; 
  

根据 MSDN 应使用 KEY_WOW64_64KEY 或 KEY_WOW64_32KEY 用于WOW64访问




I have a registry entry I can't seem to read in C++, but it shows up in Regedit.

Using the following C++ snippet:

openResult=RegOpenKeyEx( HKEY_LOCAL_MACHINE, _TEXT("SOFTWARE\\Microsoft\\NET Framework Setup\\NDP\\v4\\Full"), 0, KEY_READ, &root);
readResult1=RegQueryValueEx(root, _TEXT("InstallPath"), NULL, NULL, data1, &size);
readResult2=RegQueryValueEx(root, _TEXT("fake_entry"), NULL, NULL, data2, &size);

I get Error 2, ERROR_FILE_NOT_FOUND for my second RegQueryValueEx() call.

As you can see in the image below, my fake_entry exists.

I created this entry via Regedit.

Microsoft's Registry Keys Affected by WOW64 does not include the location I'm trying to read, and as you can see in the picture below, my fake_entry is not in the Wow6432Node location.

• Yes, I understand this isn't a registry location I should be changing. I stumbled upon this as I was debugging my code and am curious why my added fake_entry doesn't work.
• Yes, I've read about Registry Redirector.
• Yes, I've read this question.
• Yes, I tried reading fake_entry at SOFTWARE\\Wow6432Node\\Microsoft\\NET Framework Setup\\NDP\\v4\\Full with the same error.

Running Windows 7, 64 bit, C++ in Visual Studio 2010, using ASCII character encoding.

Am I misunderstanding the Registry Redirector? Is there a problem with my code? Are there some sort of permission settings on certain portions of the Registry? I'm obviously missing something. Please point me in the right direction.

解决方案

Try

openResult = RegOpenKeyEx( HKEY_LOCAL_MACHINE, _TEXT("SOFTWARE\\Microsoft\\NET Framework Setup\\NDP\\v4\\Full"), 0, KEY_READ|KEY_WOW64_64KEY, &root);

according to MSDN you should use either KEY_WOW64_64KEY or KEY_WOW64_32KEY for WOW64 access

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