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locking your arrays You usually pass your arrays to your own code, and you know that the called code won't monkey with the array's structure However, if you pass the array to external code, as you do when you raise an event in an ActiveX control, you can't rely on the array returning in the same state in which you sent it In general, you should go out of your way to reduce the vulnerability of your data only when it is passed to untrusted code You should be able to trust your own code and determine the trust boundary You can gain reasonable protection for your array structure by modifying the fFeatures flags Setting the FADF_FIXEDSIZE flag (which causes a call to ReDim Preserve to raise an error) can lock the size of the array However, preventing ReDim also requires the FADF_STATIC flag, so your array is only partially protected with FADF_FIXEDSIZE The problem with FADF_STATIC is that if you don't clear the flag before the array is destroyed, the data memory is not released In order to use fFeatures to lock the shape of your array, you have to modify fFeatures when the array is first allocated and before it is destroyed Although this is very doable (just modify the ClearArrayData routine to make the necessary modifications to the array structure), it is a hassle, and there is a built-in locking mechanism that you can use to do this without modifying the flags Locking the array is the preferred mechanism for stopping downstream routines from modifying the structure of your array A lock actually offers slightly more protection than the STATIC and FIXEDSIZE flags because a lock completely blocks the Erase statement Downstream code can operate only on individual elements in the array, not the array as a whole If you don't want your array shape to be modified, you must increment the array's lock count before passing the array and decrement the lock count after If you don't unlock your array after the call, you'll have errors and memory leaks when the array is freed, and you should provide a local error handler when errors are possible As I mentioned earlier, an array is locked when one of its elements (as opposed to the array itself) is passed to a ByRef parameter or used in a With statement when the element is a structure type In this way, the With statement provides a simple mechanism for locking arrays that also provides automatic array unlocking However, you can't use the With statement with arrays of simple or object types For arrays that aren't structures, you can lock directly with the SafeArrayLock and SafeArrayUnlock API calls.

eighteenth century the bank maintained its position as a chief bullion market, although London was obtaining a large volume of Brazilian gold and was providing strong competition (406) An active foreign exchange market was maintained at Amsterdam Drafts on Amsterdam were used to finance the trade of many countries The use of bank acceptances increased Dutch private bankers financed not only foreign trade but foreign governments, such as those of Austria and Russia They financed foreign producers and foreign consumers a century before English bankers became international bankers Dutch capital was very important in the eighteenth-century London money market (407) When the yield on safe investments in London rose well above the level in Amsterdam, Dutch capital flowed to London, and the rate of exchange moved in favor of London Dutch capital in this way supported the exchange value of sterling in several crises.

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The peace of 1763 was followed by a crisis and panic in Amsterdam There were many bankruptcies Another crisis in 1773 brought rescue from the Bank of England The Dutch speculated increasingly in English securities as well as in their own and the results were costly In 1781 the Bank of Amsterdam could not meet its obligations (408) The perpetual government annuities, which the Dutch had so successfully developed in the sixteenth and seventeenth centuries, were used throughout the eighteenth century without important improvements State credit was based on the established Dutch habit of making provision for their old age and for their families by buying these perpetual annuities (409) Large groups lived on investment income Although temporary floating debt was occasionally created by the government, it was soon funded and usually commanded the same low rates paid on the funded debt.

'Lock a Long array during an external call Dim lArr () As Long ReDim lArr(0) On Error GoTo Error SafeArrayLock VBoostDeref(VarPtrArray(lArr)) PassLongArray lArr Error: SafeArrayUnlock VBoostDeref(VarPtrArray(lArr)) With Err If Number Then Raise Number, _ Source, Description, HelpFile, HelpContext End With Sub PassLongArray(lArr() As Long) Erase lArr 'Error 10 End Sub 'Lock an object type array during a call Dim GuidArr() As VBGUID ReDim GuidArr(0) With GuidArr(0) PassGuidArray GuidArr End With Sub PassObjectArray(GuidArr() As VBGUID) Erase GuidArr 'Error 10 End Sub Alternate Array Allocation Techniques You need both a descriptor and data in order to have a viable array VB's ReDim statement uses a separate heap allocation for the descriptor and the array There are two ways to reduce the number of heap allocations required for a variable-size array The first is to use the SafeArrayCreateVectorEx API call, which allocates the descriptor and array in a single heap allocation The second mechanism, applicable to local arrays only, is to use a local descriptor and explicit stack allocation The SafeArrayCreateVectorEx API takes a Variant type (such as vbLong or vbInteger) and returns an allocated array I'll show the Ex version of the API to support creation of arrays with the FADF_RECORD, FADF_HAVEIID, and

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