c - MultiByteToWideChar wchar * 到 char *

Question

这是函数:

char *ToLowerSTR(/*char*/ WCHAR* buffer) // NEED TO FIX UNRESOLVED EXTERNAL
{
    CHAR* str;
    MultiByteToWideChar(CP_ACP, 0, str, strlen(str) + 1, buffer, sizeof(buffer)/sizeof(WCHAR));
....
return str;
}

和错误:

LNK2019: unresolved external symbol "char * __cdecl ToLowerSTR(char *)" (?ToLowerSTR@@YAPADPAD@Z) referenced in function "unsigned long __cdecl GetPID(char *)" )

如何将 wchar * 转换为 char *？

Answer 1

您的链接器正在尝试查找如下函数:

char * ToLowerSTR(char *)

但您已将函数定义为将 WCHAR 作为参数。
查看函数的声明，看看它是 WCHAR* 还是 char*