我怎么... php exec（）命令不能与其他应用程序一起使用 [英] How do i...php exec() command doesn't work with other application

问题描述

我有一个使用php开发的应用程序，我想通过我的打印机打印抖动图像所以我正在做的是我有一个名为ImageMagick的应用程序。在使用命令提示符的此应用程序中，我将传递图像路径和目标文件夹。因此，当我在命令提示符下运行命令时，它将转换图像并将其保存在目标文件夹中。



我尝试过：

I have an application which was developed using php and I want to print a dithering image through my printer so what I am doing is I have an application called ImageMagick. In this application using command prompt I will pass an image path and the destination folder. So when I run the command in the command prompt it will convert the image and save it in destination folder.

What I have tried:

Firstly I tried the php exec() for the below code
<pre><pre lang="PHP"><pre><?php
     echo exec('ipconfig');
    ?>

以上代码在浏览器上显示输出



当我给出以下代码：

The above code gives the output on the browser

When I give the below code:

<pre lang="PHP"><pre><?php
     echo exec('date');
   ?>

它给出如下输出

It gives the output as below

Enter the new date: (mm-dd-yy)

但是当我在命令提示符下运行date命令时它会给出当前命令date

我试图在php代码中运行Imagemagick命令，如下所示

But When I run the date command on the command prompt it gives the current date
I tried to run the Imagemagick command in php code as shown below

<pre lang="PHP"><pre><?php
echo exec('convert "C:\bhargav\dev\download.jpg" -resize 384 -dither FloydSteinberg -remap pattern:gray50 "C:\bhargav\dev\con.jpg"');
?>

但它不会将任何图像保存为输出，并且浏览器上不会显示错误。

But it doesn't save any image as output and no error is shown on the browser.

convert "C:\bhargav\dev\download.jpg" -resize 384 -dither FloydSteinberg -remap pattern:gray50 "C:\bhargav\dev\con.jpg"

当在命令提示符中给出上面的命令它给我输出。



我哪里错了？

when the above command is given in the command prompt it gives me the output.

Where am I going wrong?

推荐答案

任何错误都可能是 stderr ，而不是 stdout 。我怀疑php exec（）只捕获 stdout 内容（默认情况下，否则）。您需要查看服务器错误日志，而不是浏览器，以查看来自exec（）程序的错误消息。

Any errors would likely be going to stderr, not stdout. I suspect php exec() only captures stdout content (by default, if otherwise). You need to look at the server error log, not the browser, to see error messages from exec()'d programs.

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