從PdfFileWriter

Question

創建Blob存儲文件，我想合併使用Python和谷歌應用程序兩款發動機的PDF與pyPdf庫。 我讀Blob存儲的文件和我創建，我需要後來我在煩惱這個PdfFileWriter轉換成一個Blob存儲文件中的信息PdfFileWriter對象。任何想法解決它？ 謝謝:)

這裏是我的代碼：

blob_reader1 = blobstore.BlobReader(blob_key1) 
    blob_reader2 = blobstore.BlobReader(blob_key2) 

    writer = PdfFileWriter() 

    input1 = PdfFileReader(blob_reader1) 
    input2 = PdfFileReader(blob_reader2) 

    writer.addPage(input1.getPage(0)) 
    writer.addPage(input1.getPage(1)) 
    writer.addPage(input2.getPage(0)) 


    # finally, write "output" to document-output.pdf 
    # This lines are comment because it is the way to do it without google app engine--- 
    # outputStream = file("document-output.pdf", "wb") 
    # output.write(outputStream) 
    # outputStream.close() 
    #   
    # Open the file and write to it 
    #I do not how write the information are inside writer in blobstore file 
    file_name = files.blobstore.create(mime_type='application/pdf')  
    #with files.open(file_name, 'a') as f: 
    # f.write(writer) it does not work 

    # Finalize the file. Do this before attempting to read it. 
    files.finalize(file_name) 

    blob_key = files.blobstore.get_blob_key(file_name) 

Answer 1

可以將您的數據嘗試輸出到字符串緩衝區，然後寫緩衝到BLOB文件：

import StringIO 

stream = StringIO.StringIO() 
writer.write(stream) # write PDF content 

# Open the file and write to it 
with files.open(file_name, 'a') as f: 
    f.write(stream.getvalue()) 

然後敲定並執行通常的操作。