windows下使用c++集成打印后台处理程序api接口获取默认打印机各项信息

在Windows下，可以使用Windows API来获取默认打印机的各项信息。具体步骤如下：

1. 引入Windows头文件

#include <windows.h>
#include <winspool.h>

2. 定义函数获取默认打印机名称

void getDefaultPrinterName(char* printerName, DWORD size)
{
    DWORD dwSize = size; // 缓冲区大小
    GetDefaultPrinter(printerName, &dwSize);
}

3. 定义函数获取打印机属性

void getPrinterProperties(char* printerName)
{
    HANDLE hPrinter; // 打印机句柄
    PRINTER_DEFAULTS pd; // 打印机默认选项
    PRINTER_INFO_2* pi2; // 打印机信息结构体
    DWORD dwSize; // 缓冲区大小

    // 初始化打印机默认选项
    pd.pDatatype = NULL;
    pd.pDevMode = NULL;
    pd.DesiredAccess = PRINTER_ALL_ACCESS;

    // 打开指定打印机
    if (OpenPrinter(printerName, &hPrinter, &pd) == FALSE)
    {
        printf("OpenPrinter failed, error code: %d\n", GetLastError());
        return;
    }

    // 获取打印机属性
    if (GetPrinter(hPrinter, 2, NULL, 0, &dwSize) == 0)
    {
        if (GetLastError() != ERROR_INSUFFICIENT_BUFFER)
        {
            printf("GetPrinter failed, error code: %d\n", GetLastError());
            ClosePrinter(hPrinter);
            return;
        }
    }

    pi2 = (PRINTER_INFO_2*)malloc(dwSize);

    if (GetPrinter(hPrinter, 2, (LPBYTE)pi2, dwSize, &dwSize) == 0)
    {
        printf("GetPrinter failed, error code: %d\n", GetLastError());
        ClosePrinter(hPrinter);
        free(pi2);
        return;
    }

    // 输出打印机属性
    printf("Printer name: %s\n", pi2->pPrinterName);
    printf("Driver name: %s\n", pi2->pDriverName);
    printf("Port name: %s\n", pi2->pPortName);
    printf("Print processor: %s\n", pi2->pPrintProcessor);

    // 清理资源
    ClosePrinter(hPrinter);
    free(pi2);
}

4. 调用函数获取默认打印机名称和打印机属性

int main()
{
    char printerName[MAX_PATH];
    getDefaultPrinterName(printerName, MAX_PATH);
    printf("Default printer name: %s\n", printerName);

    getPrinterProperties(printerName);

    return 0;
}