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ceregopenkeyex (rapi)

rapi is for smart devices, not desktop Windows. Therefore, this information only applies to code using the .NET Compact Framework. To see if information for ceregopenkeyex in other DLLs exists, click on Find References to the right.

This function opens the specified key in the Windows CE registry

C# Signature:

[DllImport("rapi.dll", CharSet=CharSet.Unicode)]
public static extern uint CeRegOpenKeyEx(
    uint HKEY,
    string lpSubKey,
    int ulOptions,
    uint samDesired,
    out uint phkResult);

User-Defined Types:

uint HKEY_CLASSES_ROOT = 0x80000000;
uint HKEY_CURRENT_USER = 0x80000001;
uint HKEY_LOCAL_MACHINE = 0x80000002;
uint HKEY_USERS = 0x80000003;


function info on msdn at

Tips & Tricks:

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Sample Code:

uint key;
uint ret = SMLib.CeRegOpenKeyEx(HKEY_CURRENT_USER,"Software\\TestApp\\Settings",0,0x1,out key);

Alternative Managed API:


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