Problem with loading compiled c code in R x64 using dyn.load
I recently went from a 32bit laptop to a 64bit desktop (both win7). I just found out that I get an error now when loading dll's using dyn.load . I guess this is a simple mistake and I am overlooking something.
For example, I write this simple c function (foo.c):
void foo( int *x) {*x = *x + 1;}
Then compile it in command prompt:
R CMD SHLIB foo.c
Then in 32bit RI can use it in R:
> dyn.load("foo.dll")
> .C("foo",as.integer(1))
[[1]]
[1] 2
but in 64bit RI get:
> dyn.load("foo.dll")
Error in inDL(x, as.logical(local), as.logical(now), ...) :
unable to load shared object 'C:/Users/Sacha/Documents/R/foo.dll':
LoadLibrary failure: %1 is not a valid Win32 application.
nd.
Edit:
For reference, R CMD can be forced in an architecture by using --arch 64x :
R --arch x64 CMD SHLIB foo.c
Quite clear actually, I knew I was making a rooky mistake:)
My guess is that you are compiling it to a 32 bit target. You need to build it on your 64 bit machine with 64 bit tools. You can't load a 32 bit DLL into a 64 bit process, and vice versa.
我所做的是每次编译一次--arch x64和--arch 32，并手动将相应的.dll（具有相同的名称）分别放在单独的文件夹src-x64和src-i386下，这两个文件夹在相同的目录src所在的目录。
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