const char*转Qt::HANDLE

在Qt框架中，`const char*`通常代表的是字符串常量指针，而`Qt::HANDLE`是一个用于处理资源（如窗口句柄、绘图设备等）的C++指针类型。如果需要将`const char*`转换为`Qt::HANDLE`，通常是用于操作底层系统资源，比如Windows API中的HINSTANCE。

假设你有一个字符串形式的进程名（例如`"notepad.exe"`），你需要找到它的句柄，你可以这样做：

#include <QCoreApplication>
#include <QWinSystem>

// 获取进程名称
const char* processName = "notepad.exe";

// 使用QWinSystem模块将名字转换为HANDLE
Qt::HANDLE handle = QWinSystem::instance()->openProcess(QProcess::ReadWriteAccess, false, processName);

这里，`QWinSystem::openProcess()`函数会尝试打开指定进程并返回一个`Qt::HANDLE`，你可以随后使用这个句柄进行进一步的操作。

相关问题

如何将以下代码转成pyside6的 #include <QtGui> class GripLabel: public QLabel { Q_OBJECT public: GripLabel(QString const& title, QWidget* parent = 0) : QLabel(title, parent), resizing(false), gripSize(10, 10) { // Prevent the widget from disappearing altogether // Bare minimum would be gripSize setMinimumSize(100, 30); } QSize sizeHint() const { return minimumSize(); } protected: bool mouseInGrip(QPoint mousePos) { // "handle" is in the lower right hand corner return ((mousePos.x() > (width() - gripSize.width())) && (mousePos.y() > (height() - gripSize.height()))); } void mousePressEvent(QMouseEvent *e) { // Check if we hit the grip handle if (mouseInGrip(e->pos())) { oldPos = e->pos(); resizing = true; } else { resizing = false; } } void mouseMoveEvent(QMouseEvent *e) { if (resizing) { // adapt the widget size based on mouse movement QPoint delta = e->pos() - oldPos; oldPos = e->pos(); setMinimumSize(width()+delta.x(), height()+delta.y()); updateGeometry(); } } void paintEvent(QPaintEvent *e) { QLabel::paintEvent(e); QPainter p(this); p.setPen(Qt::red); p.drawRect(width()-gripSize.width(), height()-gripSize.height(), gripSize.width(), gripSize.height()); } private: bool resizing; QSize gripSize; QPoint oldPos; }; sample 主要: #include "griplabel.h" int main(int argc, char **argv) { QApplication app(argc, argv); QWidget *w = new QWidget; QPushButton *b = new QPushButton("button"); GripLabel *l = new GripLabel("Hello"); QHBoxLayout *y = new QHBoxLayout; y->addWidget(b); y->addWidget(l); y->setSizeConstraint(QLayout::SetFixedSize); w->setLayout(y); w->show(); return app.exec(); }

以下是将C++代码转换为使用Pyside6的Python代码：

from PySide6.QtCore import QPoint, QSize
from PySide6.QtGui import QPainter
from PySide6.QtWidgets import QApplication, QWidget, QPushButton, QHBoxLayout, QLabel

class GripLabel(QLabel):
    def __init__(self, title: str, parent=None):
        super().__init__(title, parent)
        self.resizing = False
        self.gripSize = QSize(10, 10)
        self.setMinimumSize(QSize(100, 30))

    def sizeHint(self):
        return self.minimumSize()

    def mouseInGrip(self, mousePos: QPoint):
        return mousePos.x() > (self.width() - self.gripSize.width()) and mousePos.y() > (self.height() - self.gripSize.height())

    def mousePressEvent(self, e):
        if self.mouseInGrip(e.pos()):
            self.oldPos = e.pos()
            self.resizing = True
        else:
            self.resizing = False

    def mouseMoveEvent(self, e):
        if self.resizing:
            delta = e.pos() - self.oldPos
            self.oldPos = e.pos()
            self.setMinimumSize(self.width() + delta.x(), self.height() + delta.y())
            self.updateGeometry()

    def paintEvent(self, e):
        super().paintEvent(e)
        p = QPainter(self)
        p.setPen(Qt.red)
        p.drawRect(self.width() - self.gripSize.width(), self.height() - self.gripSize.height(), self.gripSize.width(), self.gripSize.height())

if __name__ == '__main__':
    app = QApplication([])
    w = QWidget()
    b = QPushButton("button")
    l = GripLabel("Hello")
    y = QHBoxLayout()
    y.addWidget(b)
    y.addWidget(l)
    y.setSizeConstraint(QLayout.SetFixedSize)
    w.setLayout(y)
    w.show()
    app.exec()

需要注意的是，由于Pyside6和PyQt5在某些方面具有不同的语法和实现，因此在转换代码时可能需要进行一些调整。在本例中，我对`QLayout`类的引用进行了一些调整，并将`QPoint`和`QSize`类的头文件引用替换为`PySide6.QtCore`中的模块。

您上面给我的代码会报出D:\QtProject\DataServer\main.cpp:50: error: invalid conversion from 'const wchar_t*' to 'LPWSTR {aka wchar_t*}' [-fpermissive] if (!CreateProcessAsUser(hToken, NULL, qApp->applicationFilePath().toStdWString().data(), NULL, NULL, FALSE, CREATE_NEW_CONSOLE, NULL, NULL, &si, &pi)) { ^ 错误，请修复后给我完整代码

抱歉，因为 CreateProcessAsUser 函数需要的是非常量的 LPWSTR 类型参数，所以需要进行强制类型转换。修复后的代码如下：

#include "mainwindow.h"
#include <QApplication>
#include <windows.h>
#include <wtsapi32.h>

#pragma comment(lib, "Wtsapi32.lib")

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);

    HANDLE hToken = NULL;
    DWORD dwSessionId = WTSGetActiveConsoleSessionId();
    if (!WTSQueryUserToken(dwSessionId, &hToken)) {
        QMessageBox::warning(nullptr, QStringLiteral("错误"), QStringLiteral("获取用户令牌失败！"));
        return -1;
    }

    HANDLE mutex = ::CreateMutex(Q_NULLPTR, true, (LPCWSTR)qApp->applicationName().toStdWString().c_str());
    if (GetLastError() == ERROR_ALREADY_EXISTS) {
        QMessageBox warningBox(QMessageBox::Warning, QStringLiteral("警告"), QStringLiteral("程序[文本数据同步服务端]只能运行一个！"));
        warningBox.setButtonText(QMessageBox::Ok, QStringLiteral("确定"));
        warningBox.setStandardButtons(QMessageBox::Ok);
        warningBox.exec();
        ::CloseHandle(mutex);
        return 0;
    }
    else {
        ::ReleaseMutex(mutex);
    }

    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(hToken);
        return -1;
    }

    CloseHandle(hToken);
    return 0;
}

在调用 CreateProcessAsUser 函数时，我们使用 `(LPWSTR)` 进行强制类型转换，将 `qApp->applicationFilePath().toStdWString().data()` 的类型从 const wchar_t* 转换为 LPWSTR，以消除类型不匹配的错误。