DWORD转LPCWSTR

将DWORD类型的数值转换为LPCWSTR类型的字符串，可以使用标准库中的swprintf函数。swprintf函数可以将格式化字符串输出到指定的缓冲区中。

例如：

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

int main() {
    DWORD dwValue = 123;
    WCHAR szBuffer[32] = {0};
    swprintf(szBuffer, L"%u", dwValue);
    LPCWSTR lpwStrValue = szBuffer;
    wprintf(L"%s\n", lpwStrValue); // 输出：123
    return 0;
}

在上面的示例中，我们首先使用swprintf将DWORD类型的值转换为WCHAR类型的字符串，然后将其赋值给LPCWSTR类型的指针变量lpwStrValue。最后，我们使用wprintf函数输出LPCWSTR类型的字符串。

相关问题

#include <windows.h> #include <QString> #include <QMessageBox> int main(int argc, char *argv[]) { HANDLE mutex = ::CreateMutex(Q_NULLPTR, true, (LPCWSTR)qApp->applicationName().toStdWString().c_str()); if (GetLastError() == ERROR_ALREADY_EXISTS) { QMessageBox waringBox(QMessageBox::Warning, QStringLiteral("警告"), QStringLiteral("当前程序已运行，不能再次运行!")); waringBox.setButtonText(QMessageBox::Ok, QStringLiteral("确定")); waringBox.setStandardButtons(QMessageBox::Ok); waringBox.exec(); ::CloseHandle(mutex); return 0; } // 获取当前登录用户的会话ID DWORD sessionId; ProcessIdToSessionId(GetCurrentProcessId(), &sessionId); // 遍历所有用户会话，关闭其他用户会话中的该程序进程 DWORD sessionCount; if (ProcessIdToSessionId(GetCurrentProcessId(), &sessionId) && WTSQuerySessionInformationW(WTS_CURRENT_SERVER_HANDLE, WTS_CURRENT_SESSION, WTS_INFO_CLASS::WTS_SESSION, (LPWSTR*)&sessionCount, &sessionId)) { WTS_SESSION_INFO* pSessionInfo = NULL; if (WTSEnumerateSessions(WTS_CURRENT_SERVER_HANDLE, 0, 1, &pSessionInfo, &sessionCount)) { for (DWORD i = 0; i < sessionCount; i++) { DWORD processCount; if (WTSEnumerateProcesses(pSessionInfo[i].hServer, pSessionInfo[i].SessionId, 1, (PWTS_PROCESS_INFO*)&processCount)) { WTS_PROCESS_INFO* pProcessInfo = NULL; if (WTSEnumerateProcesses(pSessionInfo[i].hServer, pSessionInfo[i].SessionId, 1, &pProcessInfo, &processCount)) { for (DWORD j = 0; j < processCount; j++) { if (pProcessInfo[j].SessionId != sessionId && wcsstr(pProcessInfo[j].pProcessName, qApp->applicationName().toStdWString().c_str())) { HANDLE hProcess = ::OpenProcess(PROCESS_TERMINATE, FALSE, pProcessInfo[j].ProcessId); if (hProcess) { ::TerminateProcess(hProcess, 0); ::CloseHandle(hProcess); } } } ::WTSFreeMemory(pProcessInfo); } } } ::WTSFreeMemory(pSessionInfo); } } // 正常执行程序 QApplication a(argc, argv); MainWindow w; w.show(); return a.exec(); } 上面代码会报出 error: 'WTS_CURRENT_SERVER_HANDLE' was not declared in this scope错误，请修复后给我完整代码

好的，根据您提供的代码，我发现需要添加一个头文件 `wtsapi32.h` 来解决该错误。修改后的完整代码如下：

#include <windows.h>
#include <wtsapi32.h>
#include <QString>
#include <QMessageBox>

int main(int argc, char *argv[])
{
    HANDLE mutex = ::CreateMutex(Q_NULLPTR, true, (LPCWSTR)qApp->applicationName().toStdWString().c_str());
    if (GetLastError() == ERROR_ALREADY_EXISTS)
    {
        QMessageBox waringBox(QMessageBox::Warning, QStringLiteral("警告"), QStringLiteral("当前程序已运行，不能再次运行!"));
        waringBox.setButtonText(QMessageBox::Ok, QStringLiteral("确定"));
        waringBox.setStandardButtons(QMessageBox::Ok);
        waringBox.exec();
        ::CloseHandle(mutex);
        return 0;
    }

    // 获取当前登录用户的会话ID
    DWORD sessionId;
    ProcessIdToSessionId(GetCurrentProcessId(), &sessionId);

    // 遍历所有用户会话，关闭其他用户会话中的该程序进程
    DWORD sessionCount;
    if (ProcessIdToSessionId(GetCurrentProcessId(), &sessionId) && WTSQuerySessionInformationW(WTS_CURRENT_SERVER_HANDLE, WTS_CURRENT_SESSION, WTS_INFO_CLASS::WTS_SESSION, (LPWSTR*)&sessionCount, &sessionId))
    {
        WTS_SESSION_INFO* pSessionInfo = NULL;
        if (WTSEnumerateSessions(WTS_CURRENT_SERVER_HANDLE, 0, 1, &pSessionInfo, &sessionCount))
        {
            for (DWORD i = 0; i < sessionCount; i++)
            {
                DWORD processCount;
                if (WTSEnumerateProcesses(pSessionInfo[i].hServer, pSessionInfo[i].SessionId, 1, (PWTS_PROCESS_INFO*)&processCount))
                {
                    WTS_PROCESS_INFO* pProcessInfo = NULL;
                    if (WTSEnumerateProcesses(pSessionInfo[i].hServer, pSessionInfo[i].SessionId, 1, &pProcessInfo, &processCount))
                    {
                        for (DWORD j = 0; j < processCount; j++)
                        {
                            if (pProcessInfo[j].SessionId != sessionId && wcsstr(pProcessInfo[j].pProcessName, qApp->applicationName().toStdWString().c_str()))
                            {
                                HANDLE hProcess = ::OpenProcess(PROCESS_TERMINATE, FALSE, pProcessInfo[j].ProcessId);
                                if (hProcess)
                                {
                                    ::TerminateProcess(hProcess, 0);
                                    ::CloseHandle(hProcess);
                                }
                            }
                        }
                        ::WTSFreeMemory(pProcessInfo);
                    }
                }
            }
            ::WTSFreeMemory(pSessionInfo);
        }
    }

    // 正常执行程序
    QApplication a(argc, argv);
    MainWindow w;
    w.show();
    return a.exec();
}

需要注意的是，添加了 `wtsapi32.h` 的头文件之后，编译时需要链接该库文件 `wtsapi32.lib`，否则会出现 `LNK2019` 错误。

#include "mainwindow.h" #include <QApplication> #include <windows.h> #include <wtsapi32.h> #include <QLibrary> typedef BOOL(WINAPI *WTSSendMessageFunc)(HANDLE, DWORD, LPWSTR, DWORD, LPWSTR, DWORD, DWORD, LPDWORD, BOOL); int main(int argc, char *argv[]) { QApplication a(argc, argv); // 加载wtsapi32.dll QLibrary lib("wtsapi32.dll"); // 判断是否加载成功 if (!lib.load()) { QMessageBox::warning(NULL, "Warning", QString("Failed to load wtsapi32.dll: %1").arg(lib.errorString())); return 1; } // 获取函数指针 WTSSendMessageFunc WTSSendMessage = (WTSSendMessageFunc)lib.resolve("WTSSendMessageW"); if (WTSSendMessage == NULL) { QMessageBox::warning(NULL, "Warning", QString("Failed to resolve WTSSendMessageW: %1").arg(lib.errorString())); return 1; } // 获取当前会话ID DWORD dwSessionId = WTSGetActiveConsoleSessionId(); if (dwSessionId == 0xFFFFFFFF) { QMessageBox::warning(nullptr, QStringLiteral("错误"), QStringLiteral("获取会话ID失败！")); return -1; } // 获取当前会话令牌 HANDLE hToken = NULL; if (!WTSQueryUserToken(dwSessionId, &hToken)) { QMessageBox::warning(nullptr, QStringLiteral("错误"), QStringLiteral("获取用户令牌失败！")); return -1; } // 创建互斥量，确保程序只能运行一个实例 HANDLE mutex = ::CreateMutex(Q_NULLPTR, true, (LPCWSTR)qApp->applicationName().toStdWString().c_str()); if (!mutex) { QMessageBox::warning(nullptr, QStringLiteral("错误"), QStringLiteral("创建互斥量失败！")); CloseHandle(hToken); return -1; } if (GetLastError() == ERROR_ALREADY_EXISTS) { QMessageBox waringBox(QMessageBox::Warning, QStringLiteral("警告"), QStringLiteral("程序[文本数据同步客户端]只能运行一个!")); waringBox.setButtonText(QMessageBox::Ok, QStringLiteral("确定")); waringBox.setStandardButtons(QMessageBox::Ok); waringBox.exec(); ::CloseHandle(mutex); CloseHandle(hToken); return 0; } // 创建新进程，确保程序在当前会话中运行 STARTUPINFO si; ZeroMemory(&si, sizeof(si)); si.cb = sizeof(si); si.lpDesktop = (LPWSTR)L"winsta0\\default"; PROCESS_INFORMATION pi; ZeroMemory(&pi, sizeof(pi)); if (!CreateProcessAsUser(hToken, NULL, (LPWSTR)qApp->applicationFilePath().toStdWString().data(), NULL, NULL, FALSE, CREATE_NEW_CONSOLE, NULL, NULL, &si, &pi)) { QMessageBox::warning(nullptr, QStringLiteral("错误"), QStringLiteral("创建进程失败！")); CloseHandle(mutex); CloseHandle(hToken); return -1; } // 关闭会话令牌和新进程句柄 CloseHandle(hToken); CloseHandle(pi.hProcess); CloseHandle(pi.hThread); // 释放互斥量 ::ReleaseMutex(mutex); // 启动主窗口 MainWindow w; w.show(); return a.exec(); } 在以上代码中会提示："获取用户令牌失败！"，导致无法打开程序，这是什么原因，并给我解决办法

可能是因为缺少管理员权限导致获取用户令牌失败。您可以尝试以下解决办法：

1. 确保以管理员身份运行程序。
2. 在项目的.manifest文件中添加请求管理员权限的属性，以确保程序以管理员身份运行。示例代码如下：

<assembly xmlns="urn:schemas-microsoft-com:asm.v1" manifestVersion="1.0">
    <trustInfo xmlns="urn:schemas-microsoft-com:asm.v2">
        <security>
            <requestedPrivileges>
                <requestedExecutionLevel level="requireAdministrator" uiAccess="false" />
            </requestedPrivileges>
        </security>
    </trustInfo>
</assembly>

3. 在代码中使用ShellExecute函数打开程序，以确保以管理员身份运行。示例代码如下：

QString program = QCoreApplication::applicationFilePath();
QProcess::startDetached("cmd.exe", QStringList() << "/c" << "start" << " " << program);

希望以上解决办法能够帮到您。