Winapi 如何在Win32控制台应用程序中使用GetLastError函数？_Winapi

Winapi 如何在Win32控制台应用程序中使用GetLastError函数？

winapi

Winapi 如何在Win32控制台应用程序中使用GetLastError函数？,winapi,Winapi,我试图使用Windows API中的RegOpenKeyEx函数打开注册表项，并获得以下代码： #include <windows.h> #include <iostream> #include <stdio.h> #include <stdlib.h> using namespace std; int wmain(int argc, wchar_t*argv []) { HKEY hKey = HKEY_CURRENT_USER;

我试图使用Windows API中的RegOpenKeyEx函数打开注册表项，并获得以下代码：

#include <windows.h>
#include <iostream>
#include <stdio.h>
#include <stdlib.h>

using namespace std;

int  wmain(int argc, wchar_t*argv [])
{
    HKEY hKey = HKEY_CURRENT_USER;
    LPCTSTR lpSubKey = L"Demo";
    DWORD ulOptions = 0;
    REGSAM samDesired = KEY_ALL_ACCESS;
    HKEY phkResult;

    long R = RegOpenKeyEx(hKey, lpSubKey, ulOptions, samDesired, &phkResult);

    if (R == ERROR_SUCCESS)
    {
        cout << "The registry key has been opened." << endl;
    }
    else //How can I retrieve the standard error message using GetLastError() here?
    {

    }

}

#包括
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#包括
使用名称空间std；
int wmain（int argc，wchar_t*argv[]）
{
HKEY HKEY=HKEY_当前_用户；
LPCTSTR lpSubKey=L“Demo”；
DWORD-ulOptions=0；
REGSAM SAMREQUIRED=键\u所有\u访问；
HKEY phkResult；
long R=RegOpenKeyEx（hKey、lpSubKey、ulOptions、samDesired和phkResult）；
如果（R==错误\成功）
{
cout注册表函数不使用GetLastError（）
。它们直接返回实际的错误代码：
long R = RegOpenKeyEx(hKey, lpSubKey, ulOptions, samDesired, &phkResult);

if (R == ERROR_SUCCESS)
{
    cout << "The registry key has been created." << endl;
}
else
{
    cout << "The registry key has not been created. Error: " << R << endl;
}

试试这个
HKEY hKey = HKEY_CURRENT_USER;
LPCTSTR lpSubKey = L"Demo";
DWORD ulOptions = 0;
REGSAM samDesired = KEY_ALL_ACCESS;
HKEY phkResult;


char *ErrorMsg= NULL;

long R = RegOpenKeyEx(hKey, lpSubKey, ulOptions, samDesired, &phkResult);

if (R == ERROR_SUCCESS)
{

    printf("The registry key has been opened.");
}
else //How can I retrieve the standard error message using GetLastError() here?
{
     FormatMessageA(
    FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS |       FORMAT_MESSAGE_ARGUMENT_ARRAY | FORMAT_MESSAGE_ALLOCATE_BUFFER,
    NULL,
    R,
    0,
    (LPSTR)&ErrorMsg,
    0,
    NULL
);

      printf("Error while creating Reg key.");

}

是的，但是我如何在我的示例代码中使用FormatMessage？在你编辑你的问题之前，我的评论是有意义的。下次一定要更具体一些。太棒了！非常感谢，@Remy
HKEY hKey = HKEY_CURRENT_USER;
LPCTSTR lpSubKey = L"Demo";
DWORD ulOptions = 0;
REGSAM samDesired = KEY_ALL_ACCESS;
HKEY phkResult;


char *ErrorMsg= NULL;

long R = RegOpenKeyEx(hKey, lpSubKey, ulOptions, samDesired, &phkResult);

if (R == ERROR_SUCCESS)
{

    printf("The registry key has been opened.");
}
else //How can I retrieve the standard error message using GetLastError() here?
{
     FormatMessageA(
    FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS |       FORMAT_MESSAGE_ARGUMENT_ARRAY | FORMAT_MESSAGE_ALLOCATE_BUFFER,
    NULL,
    R,
    0,
    (LPSTR)&ErrorMsg,
    0,
    NULL
);

      printf("Error while creating Reg key.");

}