RegOpenKeyEx 返回 ERROR_SUCCESS 但它不应该返回（Windows 7）
我遇到了一个关于RegOpenKeyEx的问题，代码：
#include <tchar.h>
#include <stdio.h>
#include <windows.h>
#pragma comment (lib, "Advapi32.lib")
int main () {
TCHAR *keyName = _T("SOFTWARE\\foobar2000\\capabilities");
HKEY key = NULL;
if (RegOpenKeyEx(HKEY_LOCAL_MACHINE, keyName, 0, KEY_ALL_ACCESS, &key) != ERROR_SUCCESS) {
printf("open key failed!\n");
return -1;
} else {
printf("open key success!\n");
}
TCHAR *value = _T("123");
if (RegSetValueEx(key, _T("xxx"), 0, REG_SZ,
(const BYTE *)value, sizeof(TCHAR) * (_tcslen(value) + 1)) != ERROR_SUCCESS) {
printf("set value failed!\n");
}
RegCloseKey(key);
return 0;
}
将代码保存在如reg.cpp中，在命令模式下：
cl reg.cpp
就得到了reg.exe，运行它：
D:\tmp>reg.exe
open关键成功！
但该值尚未写入注册表。
另一个奇怪的事情是，如果我使用 Visual Studio 创建一个 CLI 项目，并将代码粘贴到 main() 中，RegOpenKeyEx() 将返回 false。
平台为windows 7，启用UAC。
I've got a problem about RegOpenKeyEx, the code:
#include <tchar.h>
#include <stdio.h>
#include <windows.h>
#pragma comment (lib, "Advapi32.lib")
int main () {
TCHAR *keyName = _T("SOFTWARE\\foobar2000\\capabilities");
HKEY key = NULL;
if (RegOpenKeyEx(HKEY_LOCAL_MACHINE, keyName, 0, KEY_ALL_ACCESS, &key) != ERROR_SUCCESS) {
printf("open key failed!\n");
return -1;
} else {
printf("open key success!\n");
}
TCHAR *value = _T("123");
if (RegSetValueEx(key, _T("xxx"), 0, REG_SZ,
(const BYTE *)value, sizeof(TCHAR) * (_tcslen(value) + 1)) != ERROR_SUCCESS) {
printf("set value failed!\n");
}
RegCloseKey(key);
return 0;
}
Save the code in such as reg.cpp, and in command mode:
cl reg.cpp
and I got reg.exe, run it:
D:\tmp>reg.exe
open key success!
But the value hasn't been written in the registry.
Another strange thing is that if I use the visual studio to create a CLI project, and paste the code into main(), the RegOpenKeyEx() will return false.
The platform is windows 7, and UAC is enabled.
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听起来您正在遇到虚拟化问题。如果应用没有清单，当您尝试写入 HKLM\Software 时，它实际上会写入
HKEY_USERS\_Classes\VirtualStore\Machine\Software 。为了防止这种情况，您可以提升运行该应用程序。您可能想要添加一个清单，强制它每次都以提升的权限运行。或者，停止写入 HKLM 并改用 HKCU。至于 C++/CLI 部分，我的猜测是您会获得该部分的 asInvoker 清单，该清单会抑制虚拟化并导致尝试访问 HKLM 失败。
Sounds like you're running into virtualization. IF the app has no manifest, when you try to write to HKLM\Software it actually writes to
HKEY_USERS\<User SID>_Classes\VirtualStore\Machine\Software. To prevent this, you can run the app elevated. You might want to add a manifest forcing it to run elevated every time. Alternatively, stop writing to HKLM and use HKCU instead.As for the C++/CLI part, my guess would be you are given an asInvoker manifest for that one, which suppresses virtualization and results in the attempt to get to HKLM failing.