ShellExecute() problem

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ShellExecute() problem

 
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  #1
Sep 21st, 2009
ok so i have used ShellExecute() before but with a specific value eg. "http://www.facebook.com" but now i want this program to be more flexible and allow the user to put the website he wants to.

the thing is i made a string like this
C++ Syntax (Toggle Plain Text) 
  1. String ^URL;
  2.  
  3. ShellExecute(NULL,"open",URL,NULL,NULL,SW_SHOWDEFAULT)

this gives me an error saying cannot convert system::string into LPCSTR.

btw i am using windows forms applications, how can i fix this? D:

thnx
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Re: ShellExecute() problem

 
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  #2
Sep 21st, 2009
Ok.
As you're using a std::string to store your URL and ShellExecute is expecting a pointer to a C style string (LPCSTR) as a parameter, you simply need to change your ShellExecute call to:

C++ Syntax (Toggle Plain Text) 
  1. ShellExecute(NULL,"open",URL.c_str(),NULL,NULL,SW_SHOWDEFAULT)

The c_str() function of the standard library std::string class returns the contents of the string as a C style string...Which is exactly what ShellExecute is expecting as a parameter. That should fix your problem!

Cheers for now,
Jas.
Last edited by JasonHippy; Sep 21st, 2009 at 10:55 am.
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Re: ShellExecute() problem

 
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  #3
Sep 21st, 2009
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Originally Posted by JasonHippy View Post
Ok.
As you're using a std::string
No, he is using managed C++.NET and the .NET String!!!
If you are forced to reinvent the wheel at least try to invent a better one!

Please use code tags - Please mark solved threads as solved
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Re: ShellExecute() problem

 
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  #4
Sep 21st, 2009
he's right, it's .NET string

which is

system::string...

need help plz :O
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Re: ShellExecute() problem

 
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  #5
Sep 21st, 2009
Ooops, I didn't notice that at the bottom of the post!

Hmm..It's been quite a while since I did any .NET stuff with C++.

I can't find any of my old managed code, but I know I've had to do similar conversions in the past. I think this may've been one of the ways I've used....

C++ Syntax (Toggle Plain Text) 
  1. String URL;
  2.  
  3. // some code.....Assume URL eventually gets populated with something!
  4.  
  5. // Create a CString to use as a parameter using URL....
  6. CString urlParam(&URL); // don't forget to #include <atlstr.h>
  7.  
  8. // Above: If memory serves, from VS7 onwards CString can take a pointer to a system::String as a parameter in it's constructor when using the managed extensions... But I could be wrong!
  9.  
  10. // now call shellexecute passing the CString version of URL (urlParam)..
  11. ShellExecute(NULL,"open",urlParam,NULL,NULL,SW_SHOWDEFAULT)

Alternatively, try taking a look at the following article:
http://support.microsoft.com/?id=311259

Cheers for now,
Jas.
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Re: ShellExecute() problem

 
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  #6
Sep 21st, 2009
thnx. lemme try that and get back to you

i keep getting :

C++ Syntax (Toggle Plain Text) 
  1. 1>C:\Program Files\Microsoft Visual Studio 9.0\VC\atlmfc\include\atlconv.h(90) : error C3641: 'InterlockedExchangePointer' : invalid calling convention '__stdcall ' for function compiled with /clr:pure or /clr:safe
  2. 1>C:\Program Files\Microsoft Visual Studio 9.0\VC\atlmfc\include\atlconv.h(102) : error C3641: 'ATL::_AtlGetConversionACP' : invalid calling convention '__stdcall ' for function compiled with /clr:pure or /clr:safe
  3. 1>C:\Program Files\Microsoft Visual Studio 9.0\VC\atlmfc\include\atlconv.h(535) : error C3641: 'AtlA2WHelper' : invalid calling convention '__stdcall ' for function compiled with /clr:pure or /clr:safe
  4. 1>C:\Program Files\Microsoft Visual Studio 9.0\VC\atlmfc\include\atlconv.h(554) : error C3641: 'AtlW2AHelper' : invalid calling convention '__stdcall ' for function compiled with /clr:pure or /clr:safe
  5. 1>C:\Program Files\Microsoft Visual Studio 9.0\VC\atlmfc\include\atlconv.h(572) : error C3641: 'AtlA2WHelper' : invalid calling convention '__stdcall ' for function compiled with /clr:pure or /clr:safe
  6. 1>C:\Program Files\Microsoft Visual Studio 9.0\VC\atlmfc\include\atlconv.h(577) : error C3641: 'AtlW2AHelper' : invalid calling convention '__stdcall ' for function compiled with /clr:pure or /clr:safe
  7. 1>C:\Program Files\Microsoft Visual Studio 9.0\VC\atlmfc\include\atlconv.h(530) : error C3641: 'AtlDevModeW2A' : invalid calling convention '__stdcall ' for function compiled with /clr:pure or /clr:safe
  8. 1>C:\Program Files\Microsoft Visual Studio 9.0\VC\atlmfc\include\atltrace.h(65) : error C2440: 'default argument' : cannot convert from 'int (__cdecl *)(int,const char *,int,const char *,const char *,...)' to 'ATL::CTrace::fnCrtDbgReport_t'
  9. 1>        Address of a function yields __clrcall calling convention in /clr:pure and /clr:safe; consider using __clrcall in target type
  10. 1>C:\Program Files\Microsoft Visual Studio 9.0\VC\atlmfc\include\atltrace.h(146) : fatal error C1903: unable to recover from previous error(s); stopping compilation


that error when this is my code...


C++ Syntax (Toggle Plain Text) 
  1. String ^siteURL1;
  2. CString button1URL(&siteURL1);
  3.  
  4. ShellExecute(NULL,"open",button1URL,NULL,NULL,SW_SHOWDEFAULT);

D: now im gna read that article..
Last edited by evilguyme; Sep 21st, 2009 at 4:03 pm.
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Re: ShellExecute() problem

 
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  #7
Sep 22nd, 2009
bump!

i really need help on this
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Re: ShellExecute() problem

 
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  #8
Sep 22nd, 2009
Here's a thread on the conversion. Can't test it because I don't use managed code.
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Re: ShellExecute() problem

 
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  #9
Sep 22nd, 2009
zomg thnx again

u've helped me a whole bunch.. mind PMing me ur MSN?

oooh i dun understand that whole thing cuz im still learning C++ from a book and was just making these programs to learn...

well the basic idea of that is to convert system::string to a char array yea?

if so then i can refer to that once i learn about char arrays.
Last edited by evilguyme; Sep 22nd, 2009 at 1:49 pm.
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Re: ShellExecute() problem

 
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Sep 22nd, 2009
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Originally Posted by evilguyme View Post
mind PMing me ur MSN?
Yes, actually I do mind. Keep the discussion in the forum.
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