C++如何写一个更换打印机驱动名称的程序

在C++编写一个替换打印机驱动名称的程序时，由于Windows系统通常使用COM（Component Object Model）接口来操作打印设备，你可以利用`CoCreateInstance`函数从`IPrinterDriver`接口开始。这里是一个简化示例，假设你已经有了打印机的句柄：

#include <windows.h>
#include <oaidl.h>
#include <propvarutil.h>

#pragma comment(lib, "ole32.lib")

// 打印机句柄
HDEVNAME hPrinter = ...;

// IPrinterDriver 类型标识符
REFCLSID clsidPrinterDriver = CLSID_PrinterDriver;

void change_driver_name(LPCWSTR old_name, LPCWSTR new_name) {
    // 获取当前驱动实例
    IUnknown* pUnk;
    HRESULT hr = CoCreateInstance(clsidPrinterDriver, NULL, CLSCTX_ALL, IID_IUnknown, (LPVOID*)&pUnk);
    if (FAILED(hr)) {
        std::cerr << "Failed to create printer driver instance: " << GetLastError() << std::endl;
        return;
    }

    IPrinterDriver* pDriver = static_cast<IPrinterDriver*>(pUnk);
    if (!pDriver) {
        hr = pUnk->QueryInterface(IID_IPrinterDriver, (LPVOID*)&pDriver);
        if (FAILED(hr)) {
            pUnk->Release();
            std::cerr << "Failed to query interface for IPrinterDriver: " << hr << std::endl;
            return;
        }
    }

    // 获取打印机属性存储
    IPropertyStore* pPropStore;
    hr = pDriver->GetPropertyStore(GENERIC_READ | GENERIC_WRITE, &pPropStore);
    if (FAILED(hr)) {
        pDriver->Release();
        pUnk->Release();
        std::cerr << "Failed to get property store: " << hr << std::endl;
        return;
    }

    // 搜索并替换驱动名称属性
    DWORD propId;
    P PROPVARIANT valOldName, valNewName;
    PropVariantInit(&valOldName);
    PropVariantInit(&valNewName);

    hr = pPropStore->GetProperty(VAR PrinterDriverDesc, &propId, &valOldName);
    if (hr != S_OK) {
        std::cerr << "Failed to retrieve current driver name: " << hr << std::endl;
    } else {
        hr = PropVariantChangeType(valOldName, valOldName, VT_LPWSTR, WSTR);
        if (FAILED(hr)) {
            std::cerr << "Failed to convert property value: " << hr << std::endl;
        } else {
            valNewName->vt = VT_LPWSTR;
            wprintf(L"Current driver name: %ls\n", valOldName->pbVal);
            MultiByteToWideChar(CP_UTF8, 0, old_name, -1, valNewName->pbVal, INT32_MAX);
            hr = pPropStore->SetValue(propId, valNewName);
            if (FAILED(hr)) {
                std::cerr << "Failed to set new driver name: " << hr << std::endl;
            } else {
                std::wcout << "Driver name changed from " << old_name << " to " << new_name << std::endl;
            }
        }
    }

    // 清理资源
    PropVariantClear(&valOldName);
    PropVariantClear(&valNewName);
    pPropStore->Release();
    pDriver->Release();
    pUnk->Release();
}

// 调用函数
change_driver_name(L"Wanted Old Name", L"Wanted New Name");