BorlandTalk.com Borland discussion newsgroups   Archives   FAQ   Search   Memberlist   Usergroups   Register   Profile   Log in to check your private messages   Log in  How to use Delphi and Visual C together?          BorlandTalk.com Forum Index -> Delphi IDE View previous topic :: View next topic   Author Message Rudolf Heider Guest Posted: Wed Sep 10, 2003 7:17 am    Post subject: How to use Delphi and Visual C together? Hellow! Sometimes I use Delphi to make simple front-ends for various tools, writed on c++ , and I have two questions: 1. How to link a DLL to a Delphi unit correctly? For example, I had define the function as: -------------------- extern "C"{ __declspec(dllexport) DWORD WINAPI OpenSourceFile(const char *fileName, const char *destPath) -------------------- , but the Delphi application cannot find this function in the DLL, until I define the function as follows: -------------------- interface function OpenSourceFile(Name: PChar; Dest: PChar): Integer; stdcall; {$EXTERNALSYM OpenSourceFile} implementation function OpenSourceFile; external CoreName name '_OpenSourceFile@8'; -------------------- Where I'm wrong? 2. I found that Delphi 6 doesn't unlock the dll after first run or debug the program, so I need to restart Delphi to compile the dll in Visual C. Is any way to avoid this? Excuse for me bad English, WBR, Rudolf Heider. Back to top Brian Cook Guest Posted: Wed Sep 10, 2003 8:12 am    Post subject: Re: How to use Delphi and Visual C together? Quote: Hellow! Greetings. Quote: Sometimes I use Delphi to make simple front-ends for various tools, writed on c++ , and I have two questions: 1. How to link a DLL to a Delphi unit correctly? For example, I had define the function as: -------------------- extern "C"{ __declspec(dllexport) DWORD WINAPI OpenSourceFile(const char *fileName, const char *destPath) -------------------- , but the Delphi application cannot find this function in the DLL, until I define the function as follows: -------------------- interface function OpenSourceFile(Name: PChar; Dest: PChar): Integer; stdcall; {$EXTERNALSYM OpenSourceFile} implementation function OpenSourceFile; external CoreName name '_OpenSourceFile@8'; -------------------- Where I'm wrong? You aren't wrong. Older versions of Visual C export functions with the underscore and the "parameter bytes" decorator; the "@8" part. I believe newer versions also include the decorator if you don't use a "DEF" file. I may have that backwards. It was original a standard published by Microsoft to help ensure the correct number of bytes (parameters) are passed into a DLL. Why they stopped doing it is a mystery to me. Probably something to do with the transition to 64 bit operating systems. I've also wondered why they adorned the name with the number of bytes rather than the number of parameters. Quote: 2. I found that Delphi 6 doesn't unlock the dll after first run or debug the program, so I need to restart Delphi to compile the dll in Visual C. Is any way to avoid this? That's odd. I've always had very good luck with Delphi 6 and working with DLLs. What operating system are you using? Quote: Excuse for me bad English, No need to apologize. Whoopi Goldberg quipped on her TV show that the President of the United States is incapable of properly pronouncing the word "nuclear". If our President has difficulties with English we certainly can't fault you! - Brian Back to top Rudolf Heider Guest Posted: Wed Sep 10, 2003 11:00 am    Post subject: Re: How to use Delphi and Visual C together? Hellow! "Brian Cook" wrote Quote: You aren't wrong. Older versions of Visual C export functions with the underscore and the "parameter bytes" decorator; the "@8" part. I believe newer versions also include the decorator if you don't use a "DEF" file. I may have that backwards. Thank You for advice! Quote: 2. I found that Delphi 6 doesn't unlock the dll after first run or debug the program, so I need to restart Delphi to compile the dll in Visual C. Is any way to avoid this? That's odd. I've always had very good luck with Delphi 6 and working with DLLs. What operating system are you using? I use Windows XP with service pack and Delphi 6. However, I use Visual C with Intel compiler, so MS linker replaced with Intel ilink.exe. Probably, this problem related to the Intel linker, I will check it. More symptoms of the problem are: - I can delete the dll after running or debugging the program when I use Delphi only. - When I made attempt to compile dll after running the program from Delphi, the linker writes the message: ----------------------- Linking... xilink6: executing 'C:PROGRA~1MICROS~3VC98Binlink.exe' LINK : fatal error LNK1105: cannot close file "ft_core.dll" Error executing xilink6.exe. ----------------------- After this, I cannot delete the dll from the OS. Quote: No need to apologize. Thank You too. WBR, Rudolf Heider. Back to top Rudolf Heider Guest Posted: Wed Sep 10, 2003 11:37 am    Post subject: Re: How to use Delphi and Visual C together? "Brian Cook" wrote Quote: I believe newer versions also include the decorator if you don't use a "DEF" file. I may have that backwards. Thank You again, with the DEF-file the name's decoration in the DLL became absolutely correct! WBR, Rudolf Heider. Back to top Brian Cook Guest Posted: Wed Sep 10, 2003 4:43 pm    Post subject: Re: How to use Delphi and Visual C together? Quote: Hellow! Greetings. Quote: You aren't wrong. Older versions of Visual C export functions with the underscore and the "parameter bytes" decorator; the "@8" part. I believe newer versions also include the decorator if you don't use a "DEF" file. I may have that backwards. Thank You for advice! My pleasure. Quote: 2. I found that Delphi 6 doesn't unlock the dll after first run or debug the program, so I need to restart Delphi to compile the dll in Visual C. Is any way to avoid this? That's odd. I've always had very good luck with Delphi 6 and working with DLLs. What operating system are you using? I use Windows XP with service pack and Delphi 6. However, I use Visual C with Intel compiler, so MS linker replaced with Intel ilink.exe. Probably, this problem related to the Intel linker, I will check it. More symptoms of the problem are: - I can delete the dll after running or debugging the program when I use Delphi only. - When I made attempt to compile dll after running the program from Delphi, the linker writes the message: ----------------------- Linking... xilink6: executing 'C:PROGRA~1MICROS~3VC98Binlink.exe' LINK : fatal error LNK1105: cannot close file "ft_core.dll" Error executing xilink6.exe. ----------------------- After this, I cannot delete the dll from the OS. What about if you go through these steps... 1. Run your application under the Delphi debugger 2. Shutdown your application 3. Try do delete the DLL Does that work? Do you get an "access denied" or "file locked" error? - Brian Back to top Victor Usoltsev Guest Posted: Thu Sep 11, 2003 2:06 pm    Post subject: Re: How to use Delphi and Visual C together? Quote: 1. How to link a DLL to a Delphi unit correctly? For example, I had define the function as: -------------------- extern "C"{ __declspec(dllexport) DWORD WINAPI OpenSourceFile(const char *fileName, const char *destPath) -------------------- , but the Delphi application cannot find this function in the DLL, until I define the function as follows: -------------------- interface function OpenSourceFile(Name: PChar; Dest: PChar): Integer; stdcall; {$EXTERNALSYM OpenSourceFile} implementation function OpenSourceFile; external CoreName name '_OpenSourceFile@8'; -------------------- Try to delete the WINAPI directive in C-project and replace stdcall with cdecl in Delphi project. Back to top Rudolf Heider Guest Posted: Wed Oct 08, 2003 2:15 pm    Post subject: Re: How to use Delphi and Visual C together? Hellow! "Rudolf Heider" wrote Quote: Soon I will move from Delphi 6 to Delphi 7, may be the problem will disappear... Yes, Delphi 7 haven't this bug. 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