Win32 PrintDlg、PrintDlgEx、崩溃和怪异
我的任务是解决以下问题：在 64 位计算机上运行时，我的应用程序崩溃 PrintDlg() 函数被调用。
经过挖掘和拉扯之后，我决定最好的解决方案是将 PrintDlg() 的原始调用替换为它的大哥 PrintDlgEx()。
这样做可以解决一个问题（它不再崩溃！），但会导致另一个问题。当我执行代码时，它不显示打印对话框，只是返回成功代码，并为我提供默认打印机的所有信息。我需要这个功能来显示标准的“打印设置”窗口，我不知道到底如何实现它。下面显示的是我尝试用来显示对话框的示例值。
有什么想法吗？提前致谢。
// Initialize the PRINTDLGEX structure.
pd2.lStructSize = sizeof(PRINTDLGEX);
pd2.hwndOwner = wnddata->wnd.hnd;
pd2.hDevMode = NULL;
pd2.hDevNames = NULL;
pd2.hDC = NULL;
pd2.Flags = PD_RETURNDC | PD_COLLATE;
pd2.Flags2 = 0;
pd2.ExclusionFlags = 0;
pd2.nPageRanges = 0;
pd2.nMaxPageRanges = 10;
pd2.lpPageRanges = NULL;
pd2.nMinPage = 1;
pd2.nMaxPage = 1000;
pd2.nCopies = 1;
pd2.hInstance = 0;
pd2.lpPrintTemplateName = NULL;
pd2.lpCallback = NULL;
pd2.nPropertyPages = 0;
pd2.lphPropertyPages = NULL;
pd2.nStartPage = START_PAGE_GENERAL;
pd2.dwResultAction = 0;
pdrc = PrintDlgEx (&pd2);
I'm tasked with solving the following issue: My application crashes when running on a 64 bit machine when the PrintDlg() function is called.
After digging and hair pulling, I've decided the best solution is to replace the original calls of PrintDlg() with its bigger brother, PrintDlgEx().
Doing so fixes one problem (it no longer crashes!), but causes another. When I execute the code, it is not showing the print dialog, just returning a success code, and giving me all of the information for my default printer. I need this function to show the standard "print setup" window, I don't know how the heck to make it happen. Shown below are the sample values I'm trying to use to get my dialog to show.
Any thoughts? Thanks in advance.
// Initialize the PRINTDLGEX structure.
pd2.lStructSize = sizeof(PRINTDLGEX);
pd2.hwndOwner = wnddata->wnd.hnd;
pd2.hDevMode = NULL;
pd2.hDevNames = NULL;
pd2.hDC = NULL;
pd2.Flags = PD_RETURNDC | PD_COLLATE;
pd2.Flags2 = 0;
pd2.ExclusionFlags = 0;
pd2.nPageRanges = 0;
pd2.nMaxPageRanges = 10;
pd2.lpPageRanges = NULL;
pd2.nMinPage = 1;
pd2.nMaxPage = 1000;
pd2.nCopies = 1;
pd2.hInstance = 0;
pd2.lpPrintTemplateName = NULL;
pd2.lpCallback = NULL;
pd2.nPropertyPages = 0;
pd2.lphPropertyPages = NULL;
pd2.nStartPage = START_PAGE_GENERAL;
pd2.dwResultAction = 0;
pdrc = PrintDlgEx (&pd2);
如果你对这篇内容有疑问，欢迎到本站社区发帖提问 参与讨论，获取更多帮助，或者扫码二维码加入 Web 技术交流群。
绑定邮箱获取回复消息
由于您还没有绑定你的真实邮箱，如果其他用户或者作者回复了您的评论，将不能在第一时间通知您！
发布评论
评论（1）
由于未能阅读 PRINTDLGEX结构。具体来说，它表示“如果未指定 PD_NOPAGENUMS 标志，则 lpPageRanges 必须为非 NULL”。
PrintDlg / PrintDlgEx 的根本问题是由于 WinMain 上缺少属性造成的。您需要将 WinMain 标记为 [STAThreadAttribute] 以指示您的 COM 线程模型是单线程单元。其他线程模型可能有效，但我不能肯定。
You are most likely getting a return code of E_INVALIDARG, due to failure to read the fine print on the PRINTDLGEX structure. Specifically, it says "If the PD_NOPAGENUMS flag is not specified, lpPageRanges must be non-NULL."
The underlying problem with PrintDlg / PrintDlgEx is due to a missing attribute on your WinMain. You need to tag WinMain as [STAThreadAttribute] to indicate that your COM threading model is single-threaded apartment. Other threading models MAY work, but I can't say for sure.