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SQLInstallTranslatorEx Function

  • Artikkeli

Conformance
Version Introduced: ODBC 3.0

Summary
SQLInstallTranslatorEx adds information about a translator to the Odbcinst.ini section of the system information (HKEY_LOCAL_MACHINE\SOFTWARE\ODBC\ODBCINST.INI\ODBC Translators registry key).

The functionality of SQLInstallTranslatorEx can also be accessed with ODBCCONF.EXE.

Syntax

  
BOOL SQLInstallTranslatorEx(  
     LPCSTR    lpszTranslator,  
     LPCSTR    lpszPathIn,  
     LPSTR     lpszPathOut,  
     WORD      cbPathOutMax,  
     WORD *    pcbPathOut,  
     WORD      fRequest,  
     LPDWORD   lpdwUsageCount);

Arguments

lpszTranslator
[Input] This must contain a doubly null-terminated list of keyword-value pairs describing the translator. For more information about keyword-value pair syntax, see Translator Specification Subkeys.

The Translator and Setup keywords must be included in the lpszTranslator string. The translation DLL is listed with the Translator keyword, and the translator setup DLL is listed with the Setup keyword. Each pair is terminated with a NULL byte, and the entire list is terminated with a NULL byte. (That is, two NULL bytes mark the end of the list.) The format of lpszTranslator is as follows:

\0Translator=translator-DLL-filename\0[Setup=setup-DLL-filename\0]\0

lpszPathIn
[Input] Full path of where the translator is to be installed or a null pointer. If lpszPath is a null pointer, the translators will be installed in the System directory.

lpszPathOut
[Output] The path of the target directory where the translator should be installed. If the translator has never been installed, lpszPathOut is the same as lpszPathIn. If there exists a prior installation of the translator, lpszPathOut is the path of the prior installation.

cbPathOutMax
[Input] Length of lpszPathOut.

pcbPathOut
[Output] Total number of bytes available to return in lpszPathOut. If the number of bytes available to return is greater than or equal to cbPathOutMax, the output path in lpszPathOut is truncated to pcbPathOutMax minus the null-termination character. The pcbPathOut argument can be a null pointer.

fRequest
[Input] Type of request. fRequest must contain one of the following values:

ODBC_INSTALL_INQUIRY: Inquire about where a translator can be installed.

ODBC_INSTALL_COMPLETE: Complete the installation request.

lpdwUsageCount
[Output] The usage count of the translator after this function has been called.

Applications should not set the usage count. ODBC will maintain this count.

Returns

The function returns TRUE if it is successful, FALSE if it fails.

Diagnostics

When SQLInstallTranslatorEx returns FALSE, an associated *pfErrorCode value can be obtained by calling SQLInstallerError. The following table lists the *pfErrorCode values that can be returned by SQLInstallerError and explains each one in the context of this function.

*pfErrorCode Error Description
ODBC_ERROR_GENERAL_ERR General installer error An error occurred for which there was no specific installer error.
ODBC_ERROR_INVALID_BUFF_LEN Invalid buffer length The lpszPathOut argument was not large enough to contain the output path. The buffer contains the truncated path.

The cbPathOutMax argument was 0, and the fRequest argument was ODBC_INSTALL_COMPLETE.
ODBC_ERROR_INVALID_REQUEST_TYPE Invalid type of request The fRequest argument was not one of the following:

ODBC_INSTALL_INQUIRY ODBC_INSTALL_COMPLETE
ODBC_ERROR_INVALID_KEYWORD_VALUE Invalid keyword-value pairs The lpszTranslator argument contained a syntax error.
ODBC_ERROR_INVALID_PATH Invalid install path The lpszPathIn argument contained an invalid path.
ODBC_ERROR_INVALID_PARAM_SEQUENCE Invalid parameter sequence The lpszTranslator argument did not contain a list of keyword-value pairs.
ODBC_ERROR_USAGE_UPDATE_FAILED Could not increment or decrement the registry's component usage count The installer failed to increment the translator's usage count.

Comments

SQLInstallTranslatorEx provides a mechanism to install just the translator. This function does not actually copy any files. The calling program is responsible for copying the translator files.

SQLInstallTranslatorEx increments the component usage count for the installed translator by 1. If a version of the translator already exists but the component usage count for the translator does not exist, the new component usage count value is set to 2.

The application setup program is responsible for physically copying the translator file and maintaining the file usage count. If the translator file has not previously been installed, the application setup program must copy the file or files and create the file or files usage count. If the file has previously been installed, the setup program simply increments the file usage count.

If an older version of the translator was previously installed by the application, the translator should be uninstalled and then reinstalled, so that the translator component usage count is valid. SQLRemoveTranslator should be called to decrement the component usage count, and then SQLInstallTranslatorEx should be called to increment the component usage count. The application setup program must replace the old file or files with the new file. The file usage count will remain the same, and other applications that used the older version file will now use the newer version.

The length of the path in lpszPathOut in SQLInstallTranslatorEx allows for a two-phase install process, so an application can determine what cbPathOutMax should be by calling SQLInstallTranslatorEx with an fRequest of ODBC_INSTALL_INQUIRY mode. This will return the total number of bytes available in the pcbPathOut buffer. SQLInstallTranslatorEx can then be called with an fRequest of ODBC_INSTALL_COMPLETE and the cbPathOutMax argument set to the value in the pcbPathOut buffer, plus the null-termination character.

If you choose not to use the two-phase model for SQLInstallTranslatorEx, you must set cbPathOutMax, which defines the size of the storage for the path of the target directory, to the value _MAX_PATH, as defined in Stdlib.h, to prevent truncation.

When fRequest is ODBC_INSTALL_COMPLETE, SQLInstallTranslatorEx does not allow lpszPathOut to be NULL (or cbPathOutMax to be 0). If fRequest is ODBC_INSTALL_COMPLETE, FALSE is returned when the number of bytes available to return is greater than or equal to cbPathOutMax, with the result that truncation occurs.

For information about See
Returning a default translation option ConfigTranslator
Selecting translators SQLGetTranslator
Removing translators SQLRemoveTranslator