c++使用Windows操作系统提供的API包括Print Spooler API和GDI Printing API发送pdf到打印机打印

使用Windows操作系统提供的API包括Print Spooler API和GDI Printing API发送PDF文件到打印机进行打印，可以按照以下步骤进行：

1. 初始化打印机设备上下文（DC）。例如：

HDC printerDC = CreateDC("WINSPOOL", "printer_name", NULL, NULL);
if (printerDC == NULL) {
    // 处理错误
}

其中，"printer_name"为打印机名称，可以通过打印机设置中查找。

2. 使用GDI+库将PDF文件转换为打印机可以处理的格式。例如：

Gdiplus::GdiplusStartupInput gdiplusStartupInput;
ULONG_PTR gdiplusToken;
Gdiplus::GdiplusStartup(&gdiplusToken, &gdiplusStartupInput, NULL);
Gdiplus::Image *image = Gdiplus::Image::FromFile(L"path_to_pdf_file");
if (image == NULL) {
    // 处理错误
}
HDC memoryDC = CreateCompatibleDC(printerDC);
if (memoryDC == NULL) {
    // 处理错误
}
HBITMAP memoryBitmap;
Gdiplus::Bitmap *bitmap = new Gdiplus::Bitmap(image->GetWidth(), image->GetHeight(), PixelFormat32bppRGB);
if (bitmap == NULL) {
    // 处理错误
}
Gdiplus::Graphics *graphics = Gdiplus::Graphics::FromImage(bitmap);
if (graphics == NULL) {
    // 处理错误
}
graphics->DrawImage(image, 0, 0);
BITMAPINFO bitmapInfo;
ZeroMemory(&bitmapInfo, sizeof(bitmapInfo));
bitmapInfo.bmiHeader.biSize = sizeof(bitmapInfo.bmiHeader);
bitmapInfo.bmiHeader.biWidth = bitmap->GetWidth();
bitmapInfo.bmiHeader.biHeight = -bitmap->GetHeight();
bitmapInfo.bmiHeader.biPlanes = 1;
bitmapInfo.bmiHeader.biBitCount = 32;
bitmapInfo.bmiHeader.biCompression = BI_RGB;
memoryBitmap = CreateDIBSection(memoryDC, &bitmapInfo, DIB_RGB_COLORS, NULL, NULL, 0);
if (memoryBitmap == NULL) {
    // 处理错误
}
SelectObject(memoryDC, memoryBitmap);
Gdiplus::Graphics *memoryGraphics = Gdiplus::Graphics::FromHDC(memoryDC);
if (memoryGraphics == NULL) {
    // 处理错误
}
memoryGraphics->DrawImage(bitmap, 0, 0);
delete memoryGraphics;
delete graphics;
delete bitmap;
delete image;

3. 将转换后的图像发送到打印机进行打印。例如：

DOCINFO docInfo;
ZeroMemory(&docInfo, sizeof(docInfo));
docInfo.cbSize = sizeof(docInfo);
docInfo.lpszDocName = L"document_name";
docInfo.lpszOutput = NULL;
docInfo.lpszDatatype = NULL;
int jobId = StartDoc(printerDC, &docInfo);
if (jobId <= 0) {
    // 处理错误
}
int pageWidth = GetDeviceCaps(printerDC, HORZRES);
int pageHeight = GetDeviceCaps(printerDC, VERTRES);
int imageWidth = GetDeviceCaps(memoryDC, HORZRES);
int imageHeight = GetDeviceCaps(memoryDC, VERTRES);
int offsetX = (pageWidth - imageWidth) / 2;
int offsetY = (pageHeight - imageHeight) / 2;
StretchBlt(printerDC, offsetX, offsetY, imageWidth, imageHeight, memoryDC, 0, 0, imageWidth, imageHeight, SRCCOPY);
EndDoc(printerDC);

4. 清理资源。例如：

DeleteDC(memoryDC);
DeleteDC(printerDC);
Gdiplus::GdiplusShutdown(gdiplusToken);

这些步骤可以帮助你使用Windows操作系统提供的API包括Print Spooler API和GDI Printing API将PDF文件发送到打印机进行打印。请注意，这只是一个基本示例，你需要根据你的实际情况进行修改。