Problem compiling code w\ Borland C++ Builder 5 and 6

[RyanS2000]

My code compiles and runs fine with MS VC++ 6.0 but when I compile and run with Borland, it crashes. Under vc++ 6 I was running winXP 32, with borland I am running vista 32bit.

It compiles with 0 errors and warnings but once it executes the below code I get a crash:

//DLL declare prototypes

extern "C" __declspec(dlle xport)RdmsrEx(D WORD, DWORD * , DWORD *, DWORD);
extern "C" __declspec(dlle xport)Initializ eOls();
extern "C" __declspec(dlle xport)GetDllSta tus();

The common error:
"...raised exception class EAccessViolatio n with message 'Access violation at address 019F3893. Write of address 0025170D. Process stopped. Use Step or Run to to continue"

[php]
//prototype
void GetTemps(DWORD* , DWORD);

//function
void GetTemps(DWORD* dwTemp, DWORD dwCoreNum)
{
DWORD dwEAX, dwEDX;

RdmsrEx( 0x19C , &dwEAX , &dwEDX , dwCoreNum );

dwEAX = dwEAX & 0xFF0000;
dwEAX = dwEAX >> 16;

*dwTemp = 95 - dwEAX;
}

//call to function

InitializeOls() ;
DWORD dwTemp;
DWORD dwAffinity = 1;
GetTemps(&dwTem p,dwAffinity);
[/php]

[arnaudk]

This probably has to do with your use of windows libraries which are incompatible with the Borland compiler. My suggestion would be to forget about Borland altogether and get the latest VC++ for Vista. Otherwise, make sure you're using libraries that are compatible with both Borland and VC++.

[RyanS2000]

The problem I posted above doesn't seem to stem from a function call where a library even comes into play. Another issue I had was my code freezing in a simple for-loop.

[TamusJRoyce]

My C++ Builder 4 book says that C++ Builder is now nearly 100% ANSI compliant. So you are right about the code working.

There should be about the same incompatibiliti es using C++ Builder with external libraries as using the MinGW compiler (codblocks ide) with external libraries.

Are you linking the dll implicitly or explicitly?

My guess is that you are trying to implicitly link a dll in Borland C++ Builder that was built with Microsoft Visual C++. The .lib file accompanying the dll produced by msvc++ is specific to msvc++ (but don't quote me on that).

If the dll was generated outside of Borland C++ Builder, try linking explicitly by using LoadLibrary(); and GetProcAddress( ); to load the library and find the address of each function you are wishing to use...

[RyanS2000]

My guess is that you are trying to implicitly link a dll in Borland C++ Builder that was built with Microsoft Visual C++. The .lib file accompanying the dll produced by msvc++ is specific to msvc++ (but don't quote me on that).

If the dll was generated outside of Borland C++ Builder, try linking explicitly by using LoadLibrary(); and GetProcAddress( ); to load the library and find the address of each function you are wishing to use...

I did use the above method (loadlibrary\ge tprocaddress) but I was unable to get it to work because the DLL was created in vc++. There was no lib file for the dll so I did the below to get it to work:

I built a def file with impdef, used an app that fixes each function call (adds _ infront of each function). And then I used implib on the created def file to create a lib file and then imported the lib file into my project. Using the above code the functions successfully get called. The function calling is taken care of.

However, if I try to call RdmsrEx twice in a row, the 2nd call throws an error. I also get errors on other lines of code if I put a for-loop in the same code block. I've never seen anything like this before in vc++.

[RyanS2000]

I got it working. After looking it over I noticed this line didn't look right

*dwTemp = 95 - dwEAX;

I assigned "95 - dwEAX" to a temporary variable and then returned that temporary variable.