我怎样才能使MS VC ++防爆preSS版在C打印机的工作？ [英] How can I make the printer work in C in MS VC++ Express edition?

问题描述

我使用VC ++ 2008的前preSS为C.版当我尝试运行此：

I am using VC++ 2008 express edition for C. When I try to run this:

/* Demonstrates printer output. */

#include <stdio.h>

main()
{ 
 float f = 2.0134;

 fprintf(stdprn, "This message is printed.\n\n");
 fprintf(stdprn, "And now some numbers:\n\n");
 fprintf(stdprn, "The square of %f is %f.", f, f*f);

 /* Send a form feed */

 fprintf(stdprn, "\f");
}

我得到这些错误四：错误C2065：STDPRN'：未声明的标识符

I get four of these errors: error C2065: 'stdprn' : undeclared identifier.

在此论坛，他们写道，它的工作原理来定义打印机如下：

On this forum, they wrote that it works to define the printer as follows:

FILE *printer;
printer = fopen("PRN", "w");

修改
它建立与FOPEN是不安全的警告。当它运行时出现错误：

EDIT It builds with a warning that fopen is unsafe. When it runs the error appears:

调试断言失败。
文件：F：\\ DD \\ vctools \\ crt_bld \\ self_x86 \\ CRT \\ SRC \\ fprintf.c
行：55

Debug Assertion fails. File: f:\dd\vctools\crt_bld\self_x86\crt\src\fprintf.c Line: 55

防爆pression：（！STR = NULL）

Expression: (str != NULL)

推荐答案

的 STDPRN 流是由Borland编译器提供的扩展 - 因为据我所知，微软从来没有支持它。关于FOPEN 使用的打开打印机设备，我不认为这将与最近的任何版本的Windows上运行，但有几样事情尝试：

The stdprn stream was an extension provided by Borland compilers - as far as I know, MS have never supported it. Regarding the use of fopen to open the printer device, I don't think this will work with any recent versions of Windows, but a couple of things to try:

• 使用 PRN：作为名称，而不是 PRN （注意冒号）


• 尝试打开使用（例如）特定设备 LPT1：（再次，注意冒号）。这当然，如果你没有一台打印机连接不起作用。


• 请不要依赖于打印对话框来了 - 你是不是真的使用Windows打印系统，当你采取这种方式（所以它可能不会解决你的问题，但值得一试）
  

• use PRN: as the name instead of PRN (note the colon)
• try opening the specific device using (for example) LPT1: (once again, note the colon). This will of course not work if you don't have a printer attached.
• don't depend on a printer dialog coming up - you are not really using the WIndows printing system when you take this approach (and so it probably won't solve your problem, but is worth a try).

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