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Posts: #64bit

Posts: # 64bit

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#64bit
Jan 23 2012
Why does Windows put 64-bit units into System32?
Andrey Karpov
The WoW64 (Windows on Windows 64) subsystem uses the register redirection and file system redirection mechanisms for 32-bit programs launched in 64-bit Windows versions while 64-bit system...
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#Cpp #64bit
Jan 23 2012
Warning C4267 in the expression unsigned n = str.find(substr)
Andrey Karpov
When porting 32-bit code on a 64-bit system, Visual C++ compiler may generate a lot of warnings C4267 for the code where the result of the function std::string::find() is saved into a variable of...
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#Cpp #64bit
Jan 23 2012
Are the types size_t and uintptr_t equivalent?
Andrey Karpov
The question if these types are equivalent and which of them and when should be used is discussed very much. But in practice you may consider them equivalent and use them as you...
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#Cpp #64bit
Jan 23 2012
Is there a way to make the type size_t 32-bit in a 64-bit program?
Andrey Karpov
While porting code from a 32-bit system to a 64-bit one, you may want to make the types size_t/ptrdiff_t 32-bit again to reduce the number of errors and warnings generated by the compiler. This...
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#64bit
Jan 23 2012
Why is the value of the ProgramFiles environment variable replaced with that of ProgramFiles(x86)?
Andrey Karpov
Why is the value of the %ProgramFiles% environment variable replaced with the value of %ProgramFiles(x86)% when accessing it from a 32-bit program launched in a 64-bit operating...
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#Cpp #64bit
Jan 23 2012
How can I know if the DWORD_PTR type is defined using ifdef?
Andrey Karpov
Memsize-types DWORD_PTR, INT_PTR, LONG_PTR, UINT_PTR and ULONG_PTR are intended to support 64-bit code and can safely store a pointer regardless of the platform capacity. But these types might...
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#64bit
Feb 10 2011
Why is it so hard to create a 64-bit version of an application?
Andrey Karpov
Unfortunately, despite the seeming simplicity, it is often not enough just to rebuild a 32-bit program for a 64-bit platform and fix compiler errors to provide assured operability of the...
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#64bit
Feb 10 2011
What can I use instead of rundll32.exe to run 64-bit DLL?
Andrey Karpov
There are two versions of the rundll32.exe program in 64-bit versions of Windows-family operating systems: 64-bit version: %WinDir%\System32\rundll32.exe and 32-bit...
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#64bit
Feb 10 2011
What can I use instead of "int 3" instruction in a 64-bit application?
Andrey Karpov
The 64-bit version of Visual C++ compiler does not support inline assembler, so you cannot write code like "__asm int 3". But there is one more, less known mechanism to create interrupts...
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#64bit
Feb 10 2011
How can I find out in a 32-bit application what 64-bit processes are launched?
Andrey Karpov
Documented capabilities of WinAPI do not allow you to directly identify 64-bit processes from within a 32-bit program launched in a 64-bit Windows under WoW64. In general, reading of memory of...
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