[英]How to find the installation directory of a third-party application, such as Google Earth, using C#?
我有以下代码片段,它使用硬编码路径启动Google Earth进程:
var process =
new Process
{
StartInfo =
{
//TODO: Get location of google earth executable from registry
FileName = @"C:\Program Files\Google\Google Earth\googleearth.exe",
Arguments = "\"" + kmlPath + "\""
}
};
process.Start();
我想以编程方式从某个地方(很可能是注册表)获取googleearth.exe的安装位置。
显然,如果您打开与该程序关联的特定文件,则最好通过该文件启动它(例如,用户可能有一个与他们喜欢使用的文件类型相关联的程序)。
这是我过去用来启动与特定文件类型相关联的应用程序但不实际打开文件的方法。 可能有更好的方法来做到这一点。
static Regex pathArgumentsRegex = new Regex(@"(%\d+)|(""%\d+"")", RegexOptions.ExplicitCapture);
static string GetPathAssociatedWithFileExtension(string extension)
{
RegistryKey extensionKey = Registry.ClassesRoot.OpenSubKey(extension);
if (extensionKey != null)
{
object applicationName = extensionKey.GetValue(string.Empty);
if (applicationName != null)
{
RegistryKey commandKey = Registry.ClassesRoot.OpenSubKey(applicationName.ToString() + @"\shell\open\command");
if (commandKey != null)
{
object command = commandKey.GetValue(string.Empty);
if (command != null)
{
return pathArgumentsRegex.Replace(command.ToString(), "");
}
}
}
}
return null;
}
有时虽然有时您想在不打开文件的情况下启动特定程序。 通常(希望)程序有一个带有安装位置的注册表项。 以下是如何以这种方式启动Google地球的示例。
private static string GetGoogleEarthExePath()
{
RegistryKey googleEarthRK = Registry.CurrentUser.OpenSubKey(@"Software\Google\Google Earth Plus\");
if (googleEarthRK != null)
{
object rootDir = googleEarthRK.GetValue("InstallLocation");
if (rootDir != null)
{
return Path.Combine(rootDir.ToString(), "googleearth.exe");
}
}
return null;
}
这也可以:(C#代码)
Type type = Type.GetTypeFromProgID("WindowsInstaller.Installer");
Installer msi = (Installer)Activator.CreateInstance(type);
foreach (string productcode in msi.Products)
{
string productname = msi.get_ProductInfo(productcode, "InstalledProductName");
if (productname.Contains("Google Earth"))
{
string installdir = msi.get_ProductInfo(productcode, "InstallLocation");
Console.WriteLine("{0}: {1} @({2})", productcode, productname, installdir);
}
}
这是我刚刚编写的C ++版本。 直接取自ICR的C#版本。
void PrintString(CString string)
{
std::wcout << static_cast<LPCTSTR>(string) << endl;
}
CString GetClassesRootKeyValue(const wchar_t * keyName)
{
HKEY hkey;
TCHAR keyNameCopy[256] = {0};
_tcscpy_s(keyNameCopy, 256, keyName);
BOOL bResult = SUCCEEDED(::RegOpenKey(HKEY_CLASSES_ROOT, keyNameCopy, &hkey));
CString hkeyValue = CString("");
if (bResult) {
TCHAR temporaryValueBuffer[256];
DWORD bufferSize = sizeof (temporaryValueBuffer);
DWORD type;
bResult = SUCCEEDED(RegQueryValueEx(hkey, _T(""), NULL, &type, (BYTE*)temporaryValueBuffer, &bufferSize)) && (bufferSize > 1);
if (bResult) {
hkeyValue = CString(temporaryValueBuffer);
}
RegCloseKey(hkey);
return hkeyValue;
}
return hkeyValue;
}
int _tmain(int argc, TCHAR* argv[], TCHAR* envp[])
{
int nRetCode = 0;
// initialize MFC and print and error on failure
if (!AfxWinInit(::GetModuleHandle(NULL), NULL, ::GetCommandLine(), 0))
{
// TODO: change error code to suit your needs
_tprintf(_T("Fatal Error: MFC initialization failed\n"));
nRetCode = 1;
}
else
{
CString dwgAppName = GetClassesRootKeyValue(_T(".dwg"));
PrintString(dwgAppName);
dwgAppName.Append(_T("\\shell\\open\\command"));
PrintString(dwgAppName);
CString trueViewOpenCommand = GetClassesRootKeyValue(static_cast<LPCTSTR>(dwgAppName));
PrintString(trueViewOpenCommand);
// Shell open command usually ends with a "%1" for commandline params. We don't want that,
// so strip it off.
int firstParameterIndex = trueViewOpenCommand.Find(_T("%"));
PrintString(trueViewOpenCommand.Left(firstParameterIndex).TrimRight('"').TrimRight(' '));
cout << "\n\nPress <enter> to exit...";
getchar();
}
}
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