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Questions - access-violation

Access violation when calling external DLL function (QPDF library) from C# program

Build environment: Visual Studio 2019, Windows Forms Application, .net 4.7.2 I am attempting to use the QPDF .dll library to read, encrypt, and output a PDF file. See here for the DLL header file list...
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Ryan Griggs

c#

dll

external

dllimport

access-violation

Votes: 0

Answers: 1

Latest Answer

Try this: [DllImport("qpdf29.dll", CharSet = CharSet.Unicode, CallingConvention = CallingConvention.Cdecl)] static extern IntPtr qpdf_init(); [DllImport("qpdf29.dll", CharSet = Ch...
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Xiaohuan ZHOU

Access violation on 2nd iteration of for loop when accessing a 2D array

I have an assignment in C where the user has to populate a 2D grades[3][3] array. Then a function is called that returns a pointer to main() with the address of the max element in that array. So, I've...
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na-no.

c

multidimensional-array

access-violation

Votes: 0

Answers: 2

Latest Answer

In get_max, you do: int i, *max_addr = &i; Thus, max_addr is pointing [initially] to the function scoped variable i. If the if (curr_element > max) is never true, max_addr will never be update...
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Craig Estey

MsiOpenDatabaseW throws access violation when executed within an msi custom action

I have a code that modifies a cached (not the one being installed) msi installer database which works fine when executed within a standalone exe. But when it is run from within an msi Custom Action I ...
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Sergey Kolesnik

c++

debugging

windows-installer

access-violation

Votes: 0

Answers: 1

Latest Answer

You can't use MsiOpenDatabase from a custom action: Because MsiOpenDatabase initiates database access, it cannot be used with a running installation.
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Bob Arnson

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