ShellExecute 打印文件并指定打印机

`ShellExecute`函数是Windows API的一部分，用于执行外部应用程序、操作系统命令或打开文档等操作。如果你想通过`ShellExecute`打印文件并指定特定的打印机，你可以这样做：

#include <windows.h>
#pragma comment(lib, "shell32.lib") // 引入shell32库

void PrintFileToPrinter(const wchar_t* filePath, const wchar_t* printerName)
{
    // 创建命令字符串
    wchar_t command[256];
    swprintf(command, L"print \"%ls\" /d:%ls", filePath, printerName);

    // 执行ShellExecute
    HANDLE hToken;
    if (LogonUser(NULL, NULL, L"", LOGON32_LOGON_BATCH, LOGON32_PROVIDER_DEFAULT, &hToken))
    {
        HINSTANCE hInst = LoadLibraryW(L"user32.dll"); // 加载用户32库
        if (hInst != NULL)
        {
            FARPROC pShellExecute = GetProcAddress(hInst, "ShellExecuteW");
            if (pShellExecute)
            {
                if (ShellExecuteW(NULL, L"open", command, NULL, NULL, SW_SHOWNORMAL) == TRUE)
                {
                    // 打印成功
                    printf("Successfully printed file to %ls printer.\n", printerName);
                }
                else
                {
                    // 打印失败
                    printf("Failed to print file to %ls printer.\n", printerName);
                }
                FreeLibrary(hInst); // 释放库
            }
            CloseHandle(hToken); // 关闭令牌
        }
        else
        {
            printf("Failed to load user32.dll.\n");
        }
    }
    else
    {
        printf("Failed to get logon token.\n");
    }
}