DDE Support Library Error Codes
- Updated2023-02-21
- 2 minute(s) read
The DDE Support Library functions return negative values when they detect errors. This library uses a common set of error codes. Refer to the function panel help for a list of the error codes and information about the individual functions. The following table lists the error codes, defined constants, and error messages associated with functions in the the LabWindows/CVI DDE Support Library.
Use the GetDDEErrorString function to convert the error code, returned in the status parameter of DDE Support Library functions, into meaningful error messages.
Error codes are defined in the cvi\include\ddesupp.h file.
DDE Support Library Error Codes
| Code | Defined Constant | Error Message |
|---|---|---|
| 0 | kDDE_NoError | No error |
| -1 | -kDDE_UnableToRegisterService | Unable to register service |
| -2 | -kDDE_ExistingServer | Existing server |
| -3 | -kDDE_FailedToConnect | Failed to connect |
| -4 | -kDDE_ServerNotRegistered | Server not registered |
| -5 | -kDDE_TooManyConversations | Too many conversations |
| -9 | -kDDE_InvalidParameter | Invalid parameter |
| -10 | -kDDE_OutOfMemory | Insufficient memory |
| -12 | -kDDE_NoConnectionEstablished | No connection established |
| -13 | -kDDE_NotThreadOfServer | Not in thread in which server was registered |
| -14 | -kDDE_NotThreadOfClient | Not in thread in which client connection was established |
| -16 | -kDDE_AdvAckTimeOut | Advise ACK time out |
| -17 | -kDDE_Busy | DDE_FBUSY flag is set |
| -18 | -kDDE_DataAckTimeOut | XTYP_REQUEST ACK time out |
| -19 | -kDDE_DllNotInitialized | DdeInitialize has not been called |
| -20 | -kDDE_DllUsage | Server and client handle misuse |
| -21 | -kDDE_ExecAckTimeOut | Execute ACK time out |
| -22 | -kDDE_DataMismatch | Data formats mismatched |
| -23 | -kDDE_LowMemory | Memory low |
| -24 | -kDDE_MemoryError | Memory allocation failed |
| -25 | -kDDE_NotProcessed | Transaction failed |
| -26 | -kDDE_NoConvEstablished | Conversation not established |
| -27 | -kDDE_PokeAckTimeOut | Poke ACK time out |
| -28 | -kDDE_PostMsgFailed | Internal postmessage failed |
| -30 | -kDDE_ServerDied | Server died before completion |
| -31 | -kDDE_SysError | System internal error |
| -32 | -kDDE_UnadvAckTimeOut | Unadvise ACK time out |
| -33 | -kDDE_UnfoundQueueId | Transaction ID is invalid |
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Note Error codes -16 through -33 correspond to native Windows DDE error codes that start from 0x4000. |