zxing qr code encoder example c# Part 2: Visual Basic for Applications in C#

Generation QR-Code in C# Part 2: Visual Basic for Applications

Part 2: Visual Basic for Applications
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QR Code Recognizer In Visual C#
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Inside Out
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Digital Certificates: You Can Even Create Your Own There was a lot of competition in the digital certificate market in the latter half of the 1990s, as various companies vied for a share of the trusted authority pie. At the end of the decade, two companies stood out: VeriSign, and Thawte Consulting. In December 1999, VeriSign ended the competition by buying Thawte, consolidating the two largest digital certificate providers under a single corporate umbrella. You can visit the companies at http://www.verisign.com/ or http://www.thawte.com/ to get a feel for the products and services they offer. While Thawte and VeriSign are the leaders in the digital certificate market, you should pay close attention to the disclaimers they have in their standard contract. While they make their best effort to verify the identity of the individuals and organizations that purchase dig ital certificates, they do not warrant that their methods are infallible and, in fact, require you to hold them harmless should someone evade their verification procedures and assume a false digital identity.
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Exploring Visual Basic for Applications
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Digitally Signing Workbooks and Macros
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After you have acquired a digital certificate, you can sign a workbook by clicking Tools, Options, Security, Digital Signatures, Add, <certificate_name>, OK. After you click Add, the Select Certificate dialog box (shown in Figure 3-6) appears with a list of unexpired certifi cates available on your computer. You can then click the name of the certificate with which you want to sign your workbook (or click View Certificate if you want to view the details of the certificate in case some of your certificates have similar names) and click OK to sign your workbook.
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Figure 3-11. The Select Certificate dialog box lists the certificates available for digitally signing a workbook.
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The process for signing code in the Visual Basic Editor is similar to signing a workbook. To sign the VBA code associated with a workbook, you click Tools, Macro, Visual Basic Editor. In the Visual Basic Editor, click Tools, Digital Signature, Choose, select a <certificate_name>, and click OK. Unlike the Select Certificate dialog box that appears when you sign a workbook, the Select Certificate dialog box that appears when you sign your VBA code lets you use a certificate that has expired. Listing expired certificates is an odd choice because, as you ll see in the next section, signing a macro with an expired certificate is equivalent to not signing it at all. Note After the author of this chapter (Curt Frye) signed a macro using an expired certifi cate, a warning box appeared about two minutes later indicating there was a problem with the digital certificate and that the signature would be discarded. It would be better not to list expired certificates at all, but detecting the problem before the code could be sent out is an acceptable workaround.
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Using Digital Signatures with the High Macro Security Setting
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The preceding discussion of digital signatures sets the stage for discussing the High macro security level. When you have your macro security level set to High, Excel is extremely cautious about allowing any macros to run. If Excel doesn t recognize the source that signed 39
Part 2: Visual Basic for Applications
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Microsoft Office Excel 2003 Programming Inside Out the macros in the workbook you re trying to open, the security routine will either require your permission to trust the source that signed the macro or will disable macros entirely. You can add a trusted source to Excel by opening the file that contains the digitally signed macros from the developer that you want to add to the list. A Security Warning box will appear, indicating the publisher is not on the trusted list. To add the publisher to the list of trusted sources, select the Always Trust Macros from this Publisher check box and click Enable Macros. Note Your network administrator can prevent users from adding sources to the list of trusted sources, so you might need to ask your administrator to add new developers to the list. There are a number of scenarios under which digital signatures and macros can interact with Excel when the macro security level is set to High; Table 3-2 summarizes those situations and the effect of the High security setting.
Table 3-3. How Excel Reacts to Various Digital Signature Scenarios When Macro Security Is Set to High
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