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Compiler Warning (level 1) C4906

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The latest version of this topic can be found at Compiler Warning (level 1) C4906.

string literal cast to 'LPWSTR'

The compiler detected an unsafe cast. The cast did succeed, but you should use a conversion routine.

This warning is off by default. See Compiler Warnings That Are Off by Default for more information.

Example

The following sample generates C4906:

// C4906.cpp  
// compile with: /W1  
#pragma warning(default : 4906)  
#include <windows.h>  
#include <stdlib.h>  
#include <stdio.h>  
  
int main()  
{  
    LPWSTR x = (LPWSTR)"1234";   // C4906  
  
    // try the following lines instead  
    // char y[128];  
    // size_t numberOfCharConverted = 0;  
    // errcode err = 0;  
    // err = wcstombs_s(&numberOfCharConverted , &y[0], 128,  
    //                  L"12345", 4);  
    // if (err != 0)  
    // {  
    //     printf_s("wcstombs_s failed!");  
    //     return -1;  
    // }  
    // printf_s("%s\n", y);  
  
    return 0;  
}