Why are the pointers in my 64-bit ISAPI dll messed up?
I am working on migrating a 32-bit ISAPI dll to 64-bit. I am using Visual Studio 2008. I am having problems with the EXTENSION_CONTROL_BLOCK pointer in the HttpExtensionProc function. The char pointers within the EXTENSION_CONTROL_BLOCK structure are not valid on entry into the function; they are labeled with within the watch window. If I manually modify the char pointers by swapping the first 4 bytes and the last 4 bytes of the pointer, the correct values display. Any ideas why this would be happening?
This is the watch window before modifying the pointer, pay attention to lpszQueryString:
link text
This is the watch window after modifying the pointer, pay attention to lpszQueryString:
link text
The problem was that I was building with 1-byte alignment. I needed to do this:
#pragma pack(push, 8)
#include <httpext.h>
#pragma pack(pop)
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