获取环境变量,0x000000cb 操作系统找不到已输入的环境选项

include "stdafx.h"
 
#include <Windows.h>
#include <iostream>
#pragma warning(disable:4996)
int _tmain(int argc, _TCHAR* argv[])
{
    char appPath[MAX_PATH];
 
    GetEnvironmentVariableA("%%TEMP%%", appPath, );
    //取不到
    GetEnvironmentVariableA("%TEMP%", appPath, );
    //取不到
    GetEnvironmentVariableA("TEMP", appPath, );
    //取到了
 
char* psz = NULL;
    psz = getenv("%%TEMP%%");
    //取不到
    psz = getenv("%TEMP%");
    //取不到
    psz = getenv("TEMP");
    //取到了
 
    char computerName[MAX_PATH];
    DWORD bufferSize = sizeof(computerName);
    //环境变量相关api,调用成功
    //@err,hr    0x000000cb 操作系统找不到已输入的环境选项
    //内部引用了环境变量
    GetComputerNameA(computerName, &bufferSize);
    TCHAR appPath[MAX_PATH];
    char* psz = getenv("TEMP");
    //%%TEMP%%\\%s_p.ax
    /*
    GetEnvironmentVariable(_T("TEMP"), appPath, MAX_PATH);
    appPath[0] = 0; //结果正常 "C:\Users\vv\AppData\Local\Temp"
    GetEnvironmentVariable(_T("ProgramFiles"), appPath, MAX_PATH);
    appPath[0] = 0; //结果正常 "C:\Program Files"
    ExpandEnvironmentStrings(_T("ProgramFiles"), appPath, MAX_PATH);
    appPath[0] = 0; //结果取不到, ProgramFiles
    */
    ExpandEnvironmentStrings(_T("%%ProgramFiles%%"), appPath, MAX_PATH);
    appPath[] = ; //结果 取出结果套了一层符号 "%C:\Program Files%"
    ExpandEnvironmentStrings(_T("%%ProgramFiles%%\\xxx_.xx"), appPath, MAX_PATH);
    appPath[] = ; //结果 取出结果套了一层符号 "%C:\Program Files%\\xxx"
    ExpandEnvironmentStrings(_T("%ProgramFiles%\\xxx"), appPath, MAX_PATH);
                    //结果正常 "C:\Program Files"
    printf("%s\r\n",appPath);
 
    wchar_t buffer[MAX_PATH];
    DWORD code = GetEnvironmentVariable(L"WINDIR", buffer, MAX_PATH);
    std::wcout << L"WINDIR:\t\t\t" << buffer << std::endl;
 
    GetEnvironmentVariable(L"SYSTEMROOT", buffer, MAX_PATH);
    std::wcout << L"SYSTEMROOT:\t\t" << buffer << std::endl;
 
    GetEnvironmentVariable(L"SYSTEMDRIVE", buffer, MAX_PATH);
    std::wcout << L"SYSTEMDRIVE:\t\t" << buffer << std::endl;
 
    GetEnvironmentVariable(L"HOMEDRIVE", buffer, MAX_PATH);
    std::wcout << L"HOMEDRIVE:\t\t" << buffer << std::endl;
 
    GetEnvironmentVariable(L"USERPROFILE", buffer, MAX_PATH);
    std::wcout << L"USERPROFILE:\t\t" << buffer << std::endl;
 
    GetEnvironmentVariable(L"HOMEPATH", buffer, MAX_PATH);
    std::wcout << L"HOMEPATH:\t\t" << buffer << std::endl;
 
    GetEnvironmentVariable(L"TMP", buffer, MAX_PATH);
    std::wcout << L"TMP:\t\t\t" << buffer << std::endl;
 
    GetEnvironmentVariable(L"TEMP", buffer, MAX_PATH);
    std::wcout << L"TEMP:\t\t\t" << buffer << std::endl;
 
    GetEnvironmentVariable(L"APPDATA", buffer, MAX_PATH);
    std::wcout << L"APPDATA:\t\t" << buffer << std::endl;
 
    GetEnvironmentVariable(L"PROGRAMFILES", buffer, MAX_PATH);
    std::wcout << L"PROGRAMFILES:\t\t" << buffer << std::endl;
 
    GetEnvironmentVariable(L"COMMONPROGRAMFILES", buffer, MAX_PATH);
    std::wcout << L"COMMONPROGRAMFILES:\t" << buffer << std::endl;
 
    GetEnvironmentVariable(L"USERNAME", buffer, MAX_PATH);
    std::wcout << L"USERNAME:\t\t" << buffer << std::endl;
 
    GetEnvironmentVariable(L"ALLUSERSPROFILE", buffer, MAX_PATH);
    std::wcout << L"ALLUSERSPROFILE:\t" << buffer << std::endl;
 
    GetEnvironmentVariable(L"OS", buffer, MAX_PATH);
    std::wcout << L"OS:\t\t\t" << buffer << std::endl;
 
    GetEnvironmentVariable(L"COMPUTERNAME", buffer, MAX_PATH);
    std::wcout << L"COMPUTERNAME:\t\t" << buffer << std::endl;
 
    GetEnvironmentVariable(L"NUMBER_OF_PROCESSORS", buffer, MAX_PATH);
    std::wcout << L"NUMBER_OF_PROCESSORS:\t" << buffer << std::endl;
 
    GetEnvironmentVariable(L"PROCESSOR_ARCHITECTURE", buffer, MAX_PATH);
    std::wcout << L"PROCESSOR_ARCHITECTURE:\t" << buffer << std::endl;
 
    GetEnvironmentVariable(L"PROCESSOR_LEVEL", buffer, MAX_PATH);
    std::wcout << L"PROCESSOR_LEVEL:\t" << buffer << std::endl;
 
    GetEnvironmentVariable(L"PROCESSOR_REVISION", buffer, MAX_PATH);
    std::wcout << L"PROCESSOR_REVISION:\t" << buffer << std::endl;
 
    GetEnvironmentVariable(L"USERDOMAIN", buffer, MAX_PATH);
    std::wcout << L"USERDOMAIN:\t\t" << buffer << std::endl;
 
    GetEnvironmentVariable(L"COMSPEC", buffer, MAX_PATH);
    std::wcout << L"COMSPEC:\t\t" << buffer << std::endl;
 
    GetEnvironmentVariable(L"PATHEXT", buffer, MAX_PATH);
    std::wcout << L"PATHEXT:\t\t" << buffer << std::endl;
 
    GetEnvironmentVariable(L"PATH", buffer, MAX_PATH);
    std::wcout << L"PATH:\t\t" << buffer << std::endl;
 
    system("pause");
    return ;
}