为什么在Windows下没有定义stdprn？ [英] Why is stdprn not defined under Windows?
问题描述
我正在尝试打印到打印机。我在
Win 2K上使用VC ++ 6.0编译器，但是我收到错误，说明没有定义stdprn。为什么
呢？是因为Windows，我猜？我是否只需使用GDI32函数在Windows下进行打印？我可以不使用Windows下的
stdprn从内存打印到窗口吗？
Sathyaish写道：我正在尝试打印到打印机。我在Win 2K上使用VC ++ 6.0编译器，但是我得到一个错误，说明没有定义stdprn。
在C中没有名为''stdprn''的预定义流。你或许可以通过打开一个流来做你想要的
您的平台使用的名称
用于打印机。那可能是prn。例如，这适用于我的
Windows框：
#include< stdio.h>
#include< stdlib.h>
int main（无效）
{
FILE * prn;
if（！（prn = fopen（" prn"，" wb"）））} {
perror（无法打开\，输出和输出）;
退出（EXIT_FAILURE）;
}
fprintf（prn，这是一个简单的test.\ n）;
fclose（prn）;
返回0;
}
为什么
？
因为*没有在C中定义stdprn *这样的东西。
是因为Windows，我猜？
如果是这样，Windows做对了。
Sathyaish写道：我试图打印到打印机。我在Win 2K上使用VC ++ 6.0编译器，但是我得到一个错误，说明没有定义stdprn。
为什么？是因为Windows，我猜？我是否必须仅使用GDI32功能在Windows下打印？我可以不使用Windows下的
stdprn从内存打印到窗口吗？
因为它不是C语言的一部分，为什么你问这个问题吗？
- g
-
Artie Gold - 德克萨斯州奥斯汀
如果你认为不重要，你就不会注意了。
>我正在尝试打印到打印机。
在标准C中没有标准的方法可以做到这一点，除非stdout连接到打印机。
。 br />我在Win 2K上使用VC ++ 6.0编译器，但是我收到错误，说明没有定义stdprn。为什么
标准C中没有stdprn。
是什么？是因为Windows，我猜？我是否必须只使用
标准C中没有stdprn，无论平台如何。
" stdprn"是为程序员保留的名称。标题文件
喜欢< stdio.h>不应该定义它。
GDI32在Windows下打印的功能？我可以不使用Windows下的
stdprn从内存打印到窗口吗？
下定决心：打印到打印机还是打印机？窗口？
或者你的打印机本身有窗户吗？还要记住那里
并不保证计算机有打印机。或者它只有一台打印机只需要
。
许多想要打印的应用程序将它放在一个文件中然后
然后或者使用system（）和特定于平台的命令打印
它，或者在程序结束后让别的东西做。
一些应用程序打开特定于系统的设备（例如PRN：或
" / dev / lpt0"）并直接输出到它，就像它是一个文件一样。
无法保证应用程序可以与现场打印机打交道，而不是通过假脱机程序。
Gordon L. Burditt
I am trying to print to the printer. I am using a VC++ 6.0 compiler on
Win 2K, but I get an error saying that stdprn is not defined. Why is
that? Is it because of Windows, I am guessing? Do I have to use only
the GDI32 functions for printing under Windows? Can I not use the
stdprn under Windows to print from memory to the window?
Sathyaish wrote:I am trying to print to the printer. I am using a VC++ 6.0 compiler on
Win 2K, but I get an error saying that stdprn is not defined.
There is no pre-defined stream named ''stdprn'' in C. You might be able
to do what you want by opening a stream with the name your platform uses
for the printer. That might be "prn". For example, this works on my
Windows box:
#include <stdio.h>
#include <stdlib.h>
int main(void)
{
FILE *prn;
if (!(prn = fopen("prn", "wb"))) {
perror("Could not open \"prn\" for output");
exit(EXIT_FAILURE);
}
fprintf(prn, "This is a simple test.\n");
fclose(prn);
return 0;
}
Why is
that?
Because there *is no such thing as stdprn* defined in C.
Is it because of Windows, I am guessing?
If so, Windows got something right.
Sathyaish wrote:I am trying to print to the printer. I am using a VC++ 6.0 compiler on
Win 2K, but I get an error saying that stdprn is not defined. Why is
that? Is it because of Windows, I am guessing? Do I have to use only
the GDI32 functions for printing under Windows? Can I not use the
stdprn under Windows to print from memory to the window?
As it''s not a part of the C language, why are you asking here?
--ag
--
Artie Gold -- Austin, Texas
"If you don''t think it matters, you''re not paying attention."
>I am trying to print to the printer.
There is no standard way to do that in standard C, unless stdout is
connected to the printer.
I am using a VC++ 6.0 compiler on
Win 2K, but I get an error saying that stdprn is not defined. Why is
There is no stdprn in standard C.
that? Is it because of Windows, I am guessing? Do I have to use only
There is no stdprn in standard C, regardless of platform.
"stdprn" is a name reserved for the programmer. Header files
like <stdio.h> should not define it.
the GDI32 functions for printing under Windows? Can I not use the
stdprn under Windows to print from memory to the window?
Make up your mind: are you printing to a printer or to a window?
Or does your printer itself have windows? Also remember that there
is no guarantee that a computer has a printer. Or that it has only
one printer.
Many applications that want to print something put it in a file and
then either use system() with a platform-specific command to print
it, or let something else do it after the program has finished.
Some applications open a system-specific device (e.g. "PRN:" or
"/dev/lpt0") and output directly to it as though it were a file.
There is no guarantee that an application gets to talk to a "live"
printer rather than going through a spooler.
Gordon L. Burditt
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