Memo: null device in windows

folklore

1. #include <stdio.h>
   
2. #ifdef __NULDEV
   
3. #error "Macro <__NULDEV> is allready defined by other module. die.\n"
   
4. #endif
   
5. #ifdef _WINDOWS_
   
6. #define __NULDEV "NUL"
   
7. #else
   
8. #define __NULDEV "/dev/null"
   
9. #endif
   
10. int main(){
    
11.         FILE *fpnul=fopen(__NULDEV,"r+");
    
12.         if(fpnul!=NULL){
    
13.                 printf("successful\n");
    
14.                 int n=fprintf(fpnul,"it is a test %d\n",1234);
    
15.                 fprintf(stdout,"it is a test %d\n",1234);
    
16.                 printf("%d",n);
    
17.         }
    
18.         return 0;
    
19. }

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folklore

LoadLibrary in c#

1.         public static bool DllSpawnHelper(char[] args)
   
2.         {
   
3.             //System.Diagnostics.Debug.WriteLine(Application.StartupPath);
   
4.             IntPtr handle = LoadLibrary(Path.Combine(Application.StartupPath, "DllName.dll"));
   
5.             IntPtr funcPtr = GetProcAddress(handle, "FunctionName");
   
6. 
   
7.             Delegate_Dll _API fun= (Delegate_Dll _API)System.Runtime.InteropServices.Marshal.GetDelegateForFunctionPointer(funcPtr, typeof(Delegate_Dll _API));
   
8.             bool rs = fun(args);
   
9. 
   
10.             FreeLibrary(handle);
    
11. 
    
12.             return rs;
    
13.         }
    

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folklore

1. using namespace System::Runtime::InteropServices;   
   
2. void foo([Out] Bar^% x);

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out keyword in managed c++

folklore

1.                 property String^ KeyText{
   
2.                         String^ get(){
   
3.                                 return gcnew String(this->m_pInnerNode->GetKeyText().c_str());
   
4.                         }
   
5.                 }

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managed C++ propery