Hi, I'm trying to mimic the following C/C++ example in NativeBoots to allow random number generation on windows: https://gist.github.com/kbjorklu/6317361 When I combine the flags in Pharo using "|" in the same way like in the first function call of the example: acquireContextExample1 NBFFICallout stdcall: #(BOOL CryptAcquireContextA(HCRYPTPROV self, 0, 0, PROV_RSA_FULL, CRYPT_VERIFYCONTEXT | CRYPT_SILENT)) module: #advapi32 I get an error 'comma expected'. Looks like the NBFnSpecParser does not allow expression evaluation like CRYPT_VERIFYCONTEXT | CRYPT_SILENT. Will this be possible in future versions? Nonetheless I tried to continue and since I defined: CRYPT_VERIFYCONTEXT := 16rF0000000. CRYPT_SILENT := 16r00000040. I evaluated manually and tried to use the harcoded value directly: acquireContextExample2 "Retrieves information about the current console font." <primitive: 'primitiveNativeCall' module: 'NativeBoostPlugin'> ^ NBFFICallout stdcall: #(BOOL CryptAcquireContextA(HCRYPTPROV self, 0, 0, PROV_RSA_FULL, 16rF0000040)) module: #advapi32 but this returns another error when converting using #asDWord: (16rF0000040 i4) exceeds doubleword (32bit) range in an AJImmediate but 16rF0000040. Looks like it is treated as unsiged since 16rF0000040 asUImm32 asDWord works. How to specifiy the number directly but as unsigned? To reproduce: - take a fresh Pharo3.0 Latest update: #30759 - load "OSWindows" from config browser to get the core and other packages - load "OS-Windows-Cryptography" package/mcz from smalltalkhub.com/#!/~OS/OS-Windows - evaluate WinCryptoProvider new acquireContextExample2 or WinCryptoProvider new acquireContextExample1 Any helping hand in converting the example would be appreciated. Thx T.