#Photozoom pro 7.02 installation et portable x86 x64 code#

- What if the code has just been ported to a different OS?

(in Windows, both are defined in 64-bit, so this will break codebase) - What if I checked for _WIN32 first instead of second? - What if I didn't include the required header file? - What if project is corrupted, and _WIN64 and _WIN32 are not defined? - What if both ENV64BIT and ENV32BIT are not defined? - What if I made a typo and checked for ENV6BIT instead of ENV64BIT? The general rule is 'every #define must end in a #else which generates an error'. Simple check 3/3: Robust compile time checking #error 'Must define either ENV32BIT or ENV64BIT'. Wprintf(L'Diagnostics: we are running in 32-bit mode. ') Wprintf(L'ENV32BIT: Error: pointer should be 4 bytes. Wprintf(L'Diagnostics: we are running in 64-bit mode. ')

Wprintf(L'ENV64BIT: Error: pointer should be 8 bytes. In main(), double check to see if sizeof() makes sense: #if defined(ENV64BIT) I suggest the method from // Check windows Therefore, the only reliable method is to combine 3 simple checks:Ĭhoose any method to set the required #define variable. This makes it difficult to see exactly which #define is being used at compile time.

On Visual Studio 2008 SP1, sometimes the intellisense does not grey out the correct parts of the code, according to the current #define.

A project labelled 'Win32' could be set to 64-bit, due to a project configuration error.

Both _WIN32 and _WIN64 can sometimes both be undefined, if the project settings are flawed or corrupted (particularly on Visual Studio 2008 SP1).

Unfortunately, in a cross platform, cross compiler environment, there is no single reliable method to do this purely at compile time.