stupid question about dlls....

[UserLoser]

Ugh, add a definition file.

http://www.digitalmars.com/ctg/ctgDefFiles.html#exports

[l2k-Shadow]

Ugh, add a definition file.

http://www.digitalmars.com/ctg/ctgDefFiles.html#exports

right, but that's something he obviously doesn't have.

[brew]

I've tried using a definition file at least 3 times before, and they just plain don't work. Am I doing something wrong? And I know the linker is recognizing them. I've gotten some errors with it apparently interfering with the __stdcall

[MyndFyre]

Ugh, add a definition file.

http://www.digitalmars.com/ctg/ctgDefFiles.html#exports

According to Microsoft, a .def file shouldn't be necessary if you use __declspec(dllexport).

[xp]

sure. http://zenixstudios.com/f.php?f=xjskjkpo

Code Select Expand


Private Declare Function asdfness Lib "dlltest" (asdf As Integer) As Integer
Private Sub Form_Load()
Dim asdf As Integer
asdf = 5
asdf = asdfness(asdf)
MsgBox asdf
End Sub

extern "C" {
int __declspec(dllexport) asdfness(int asdf) {
int lolz = 0;
lolz = asdf + 3000;
return lolz;
}
}



Coincidentally, the Visual Basic Integer and the C int type are two very different things.

[l2k-Shadow]

yes, int in C is a 32bit integer, it's a 16bit integer in VB.

[MyndFyre]

yes, int in C is a 32bit integer, it's a 16bit integer in VB.

C does not define a standard size for int.  Most compilers implement as a 32-bit value.  However, some may implement it as 16.

[brew]

Then what's a long (by default) ?
I'm using Visual C++....

[l2k-Shadow]

Then what's a long (by default) ?
I'm using Visual C++....

check using sizeof()

Code Select Expand


#include <iostream.h>

void main()
{
     cout << "Int: " << sizeof(int) << "\n" << "Long: " << sizeof(long) << "\n";
}


[brew]

what the hell! so in VC++ an integer and a long are the same size.. what is the difference between the two? also what does VC++ use for a big endian 2 byte data type?

[l2k-Shadow]

have to write a converting function if you're on a little endian system.

[MyndFyre]

what the hell! so in VC++ an integer and a long are the same size.. what is the difference between the two? also what does VC++ use for a big endian 2 byte data type?

Since VC++ only targets Windows and Windows runs on little-endian systems only, VC++ does not use a big-endian 2-byte type.

Standard 2-byte type is short int.

These are the numeric types and macros defined in by the Windows platform SDK:

char = CHAR = signed 8-bit
unsigned char = BYTE = unsigned 8-bit
short int = SHORT = signed 16-bit
unsigned short int = WORD = unsigned 16-bit
long int = LONG = signed 32-bit
unsigned long int = DWORD = unsigned 32-bit
long long int = LONGLONG = __int64 = signed 64-bit
unsigned long long int = ULONGLONG = __uint64 = unsigned 64-bit

[brew]

For a 64 bit data type couldn't you also just use a double?

[l2k-Shadow]

For a 64 bit data type couldn't you also just use a double?

yes but double is a floating point number.

[brew]

it could still store up to 2^64 in whole numbers with no decimals, right? Theoretically?