MFC：获取所有打印机的名称（打印机模块-2）

背景：

“遍历当前用户的每一台虚拟打印机，将其默认纸张设置为 A4 并设置为纵向。”

实现原理：

1.从当前用户的注册表读取所有已配置的打印机；
2.遍历每台打印机；
3.输出其逻辑与实际纸张大小；
4.尝试设置为 A4 纸，纵向；
5.输出设置是否成功。

#include <Windows.h>
#include <stdio.h>void SetPrinterPaperSizeAndOrientation(HANDLE hPrinter, int nPaperIndex, int nOrientation)
{DEVMODE devMode;memset(&devMode, 0, sizeof(DEVMODE));devMode.dmSize = sizeof(DEVMODE);// 获取当前打印机的设备模式if (DocumentProperties(NULL, hPrinter, NULL, &devMode, NULL, DM_OUT_BUFFER) != IDOK){// 获取设备模式失败return;}// 修改纸张大小和方向devMode.dmPaperSize = nPaperIndex; // 设置纸张大小devMode.dmOrientation = nOrientation; // 设置纸张方向// 更新打印机的设备模式if (DocumentProperties(NULL, hPrinter, NULL, &devMode, &devMode, DM_IN_BUFFER | DM_OUT_BUFFER) != IDOK){// 更新设备模式失败return;}// 获取逻辑高度和实际高度int nLogicHeight = devMode.dmPelsHeight; // 逻辑高度int nActualHeight = devMode.dmYResolution; // 实际高度
}// 获取打印机纸张信息
void GetPrinterPaperInfo(const TCHAR* pszPrinterName, int& nLogicalWidth, int& nLogicalHeight, int& nPhysicalWidth, int& nPhysicalHeight)
{HKEY hKey;LONG lResult;// 构造打印机注册表项路径TCHAR szKeyPath[MAX_PATH];_stprintf_s(szKeyPath, _T("Software\\Microsoft\\Windows NT\\CurrentVersion\\Print\\Printers\\%s\\PrinterDriverData"), pszPrinterName);// 打开打印机注册表项lResult = RegOpenKeyEx(HKEY_LOCAL_MACHINE, szKeyPath, 0, KEY_READ, &hKey);if (lResult == ERROR_SUCCESS){TCHAR szData[MAX_PATH];DWORD dwDataSize = sizeof(szData);// 获取逻辑纸张宽度lResult = RegQueryValueEx(hKey, _T("PaperWidth"), NULL, NULL, (LPBYTE)szData, &dwDataSize);
if (lResult == ERROR_SUCCESS)
{// 正确处理数据printf("Value data: %s\n", szData);
}
else if (lResult == ERROR_MORE_DATA)
{printf("Buffer size too small\n");
}
else if (lResult == ERROR_INVALID_PARAMETER)
{printf("Invalid parameter\n");
}
else
{printf("Error querying default registry value: %d\n", lResult);
}if (lResult == ERROR_SUCCESS){sscanf_s(szData, "%d", &nLogicalWidth);}// 获取逻辑纸张高度lResult = RegQueryValueEx(hKey, _T("PaperHeight"), NULL, NULL, (LPBYTE)szData, &dwDataSize);if (lResult == ERROR_SUCCESS){sscanf_s(szData, "%d", &nLogicalHeight);}// 获取实际纸张宽度lResult = RegQueryValueEx(hKey, _T("PaperWidthActual"), NULL, NULL, (LPBYTE)szData, &dwDataSize);if (lResult == ERROR_SUCCESS){sscanf_s(szData, "%d", &nPhysicalWidth);}// 获取实际纸张高度lResult = RegQueryValueEx(hKey, _T("PaperHeightActual"), NULL, NULL, (LPBYTE)szData, &dwDataSize);if (lResult == ERROR_SUCCESS){sscanf_s(szData, "%d", &nPhysicalHeight);}RegCloseKey(hKey);}
}int main()
{HKEY hKey;LONG lResult;DWORD dwIndex = 0;TCHAR szPrinterName[MAX_PATH];DWORD dwSize = sizeof(szPrinterName);// 打开打印机列表注册表项lResult = RegOpenKeyEx(HKEY_CURRENT_USER, _T("Software\\Microsoft\\Windows NT\\CurrentVersion\\Devices"), 0, KEY_READ, &hKey);if (lResult == ERROR_SUCCESS){// 遍历打印机列表while (RegEnumKeyEx(hKey, dwIndex, szPrinterName, &dwSize, NULL, NULL, NULL, NULL) == ERROR_SUCCESS){int nLogicalWidth = 0; // 逻辑纸张宽度int nLogicalHeight = 0; // 逻辑纸张高度int nPhysicalWidth = 0; // 实际纸张宽度int nPhysicalHeight = 0; // 实际纸张高度// 获取打印机纸张信息GetPrinterPaperInfo(szPrinterName, nLogicalWidth, nLogicalHeight, nPhysicalWidth, nPhysicalHeight);// 输出获取的纸张信息printf("Printer Name: %s\n", szPrinterName);printf("Logical Paper Size: %d x %d\n", nLogicalWidth, nLogicalHeight);printf("Physical Paper Size: %d x %d\n", nPhysicalWidth, nPhysicalHeight);// 重置打印机名称缓冲区大小dwSize = sizeof(szPrinterName);dwIndex++;}RegCloseKey(hKey);}return 0;
}