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Compiler Warning (level 1) C4906 

  • Artículo

Error Message

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;
}