(SQL Server) Example: Http.DownloadAppend method

Demonstrates the DownloadAppend method.

Chilkat ActiveX Downloads ActiveX for 32-bit and 64-bit Windows

-- Important: See this note about string length limitations for strings returned by sp_OAMethod calls.
--
CREATE PROCEDURE ChilkatSample
AS
BEGIN
    DECLARE @hr int
    -- Important: Do not use nvarchar(max).  See the warning about using nvarchar(max).
    DECLARE @sTmp0 nvarchar(4000)
    DECLARE @success int
    SELECT @success = 0

    SELECT @success = 0

    DECLARE @targetPath nvarchar(4000)
    SELECT @targetPath = 'c:/temp/qa_output/download.txt'

    DECLARE @http int
    EXEC @hr = sp_OACreate 'Chilkat.Http', @http OUT
    IF @hr <> 0
    BEGIN
        PRINT 'Failed to create ActiveX component'
        RETURN
    END

    EXEC sp_OASetProperty @http, 'KeepResponseBody', 1

    -- Assume the target file in the local filesystem does not yet exist.
    EXEC sp_OAMethod @http, 'DownloadAppend', @success OUT, 'https://chilkatsoft.com/testData/helloWorld.txt', @targetPath
    DECLARE @statusCode int
    EXEC sp_OAGetProperty @http, 'LastStatus', @statusCode OUT
    IF @statusCode = 0
      BEGIN
        -- Unable to either send the request or get the response.
        EXEC sp_OAGetProperty @http, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @http
        RETURN
      END

    -- Should be 200.

    PRINT 'Response status code: ' + @statusCode

    -- Examine the contents of the file.
    DECLARE @sb int
    EXEC @hr = sp_OACreate 'Chilkat.StringBuilder', @sb OUT

    EXEC sp_OAMethod @sb, 'LoadFile', @success OUT, @targetPath, 'utf-8'
    EXEC sp_OAMethod @sb, 'GetAsString', @sTmp0 OUT
    PRINT @sTmp0

    -- Output: 
    -- Response status code: 200
    -- Hello World!

    -- Download another text file and append to the target file.
    EXEC sp_OAMethod @http, 'DownloadAppend', @success OUT, 'https://chilkatsoft.com/testData/this_is_a_test.txt', @targetPath
    EXEC sp_OAGetProperty @http, 'LastStatus', @statusCode OUT
    IF @statusCode = 0
      BEGIN
        -- Unable to either send the request or get the response.
        EXEC sp_OAGetProperty @http, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
        EXEC @hr = sp_OADestroy @http
        EXEC @hr = sp_OADestroy @sb
        RETURN
      END

    -- Should be 200.

    PRINT 'Response status code: ' + @statusCode

    -- Examine the contents of the file.
    EXEC sp_OAMethod @sb, 'LoadFile', @success OUT, @targetPath, 'utf-8'
    EXEC sp_OAMethod @sb, 'GetAsString', @sTmp0 OUT
    PRINT @sTmp0

    -- Output:
    -- Response status code: 200
    -- Hello World!This is a Test.

    -- Delete the local target file.
    DECLARE @fac int
    EXEC @hr = sp_OACreate 'Chilkat.FileAccess', @fac OUT

    EXEC sp_OAMethod @fac, 'FileDelete', @success OUT, @targetPath

    -- Try to download a file that does not exist:
    EXEC sp_OAMethod @http, 'DownloadAppend', @success OUT, 'https://chilkatsoft.com/testData/does_not_exist.txt', @targetPath
    EXEC sp_OAGetProperty @http, 'LastStatus', @statusCode OUT
    IF @statusCode = 0
      BEGIN
        -- Unable to either send the request or get the response.
        EXEC sp_OAGetProperty @http, 'LastErrorText', @sTmp0 OUT
        PRINT @sTmp0
      END
    ELSE
      BEGIN
        -- We got a response, and we already know it wasn't a 200 success response.
        -- It should be a 404 not found.

        PRINT 'Response status code: ' + @statusCode
        -- Examine the response body.

        PRINT 'Response body:'
        EXEC sp_OAGetProperty @http, 'LastResponseBody', @sTmp0 OUT
        PRINT @sTmp0
      END

    EXEC @hr = sp_OADestroy @http
    EXEC @hr = sp_OADestroy @sb
    EXEC @hr = sp_OADestroy @fac


END
GO