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This is one of my mixed programming exersizes: 
 
&nbsp; &nbsp; String* s10 = S&quot;char ptr&quot;; 
&nbsp; &nbsp; const __wchar_t __pin* sp = PtrToStringChars(s10); 
&nbsp; &nbsp; char* sChar = (char*)(void*)System::Runtime::InteropServices::Marshal::StringToHGlobalAnsi(s10); 
 
&nbsp; &nbsp; std::cout &lt;&lt;&nbsp;sChar &lt;&lt;&nbsp;std::endl; 
 
&nbsp; &nbsp; System::Runtime::InteropServices::Marshal::FreeHGlobal(sChar); 
 
I don't remember why it is written by such way, but it works.
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This is one of my mixed programming exersizes:

    String* s10 = S"char ptr";
    const __wchar_t __pin* sp = PtrToStringChars(s10);
    char* sChar = (char*)(void*)System::Runtime::InteropServices::Marshal::StringToHGlobalAnsi(s10);

    std::cout << sChar << std::endl;

    System::Runtime::InteropServices::Marshal::FreeHGlobal(sChar);

I don't remember why it is written by such way, but it works.

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I have a managed type of String str. I want to convert it into a C++ style char* and copy it into str1. I am using VC++.Net. 
 
I use the following code. The str1 gets converted to const char* str2 but I get a null exception 
when I try to copy the const char* str2 to char* str1. What do I need to do to get this code running? Please help.. Thank you. 
 
//to convert a String* to char* &nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
 
char* str1 = &quot;&quot;; 
 
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
try { 
IntPtr ptr = Marshal::StringToHGlobalAnsi(str); 
const char *str2 = static_cast&lt;const char*&gt;(ptr.ToPointer()); 
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
strcpy(str1, str2); //this is the problem 
&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; &nbsp;&nbsp;&nbsp;&nbsp;&nbsp; 
Marshal::FreeHGlobal(ptr); 
} 
catch (System::Exception *x) { 
// StringToHGlobalAnsi() failed. 
}
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I have a managed type of String str. I want to convert it into a C++ style char* and copy it into str1. I am using VC++.Net.

I use the following code. The str1 gets converted to const char* str2 but I get a null exception
when I try to copy the const char* str2 to char* str1. What do I need to do to get this code running? Please help.. Thank you.

//to convert a String* to char*		

char* str1 = "";

	
try {
IntPtr ptr = Marshal::StringToHGlobalAnsi(str);
const char *str2 = static_cast<const char*>(ptr.ToPointer());
		
strcpy(str1, str2); //this is the problem
		
Marshal::FreeHGlobal(ptr);
}
catch (System::Exception *x) {
// StringToHGlobalAnsi() failed.
}

converting a System::String to a c++ char array

The .NET Framework is not specific to any one programming language; rather, it includes a library of functions that allows developers to rapidly build applications. Several supported languages include C#, VB.NET, C++ or ASP.NET.