windows 如何从 C 程序调用 notepad.exe？
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How can I call notepad.exe from a C program?
提问by ask22
i have written a time table program in c
我用c写了一个时间表程序
#include<stdio.h>
#include<conio.h>
void main()
{
int i=0;
int selection;
char day[20];
char sub1[20];
char sub2[20];
char sub3[20];
FILE *fp;
fp=fopen("aa.txt","w");
textcolor(5);
textbackground(3);
clrscr();
while(i<3)
{
printf("Enter the day ");
scanf("%s",day);
printf("Enter the period 12.30-1:30 ");
scanf("%s",sub1);
printf("Enter the period 1.35-2.40 ");
scanf("%s",sub2);
printf("Enter the period 2.45-3.50 ");
scanf("%s",sub3);
fprintf(fp,"\n %s TIMETABLE IS AS FOLLOWS\n",day);
fprintf(fp,"~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~\n");
fprintf(fp,"|~~~~~~~~~|~~~~~~~~~~~~~~~|~~~~~~~~~~~~~~|~~~~~~~~~~|\n");
fprintf(fp,"| TIME | 12.30-1.30 | 1.35-2.40 |2.45-3.50 |\n");
fprintf(fp,"|~~~~~~~~~|~~~~~~~~~~~~~~~|~~~~~~~~~~~~~~|~~~~~~~~~~|\n");
fprintf(fp,"| SUBJECT * %s * %s * %s|\n",sub1,sub2,sub3);
fprintf(fp,"|~~~~~~~~~|~~~~~~~~~~~~~~~|~~~~~~~~~~~~~~|~~~~~~~~~~|\n");
i++;
}
printf(" Time table has been Created in the File aa.txt successfully");
getch();
}
when i finish the timetable . the time table is created in a.txt file. i want that file to be opened and show me automatically in a notepad. how to program that in c?
当我完成时间表时。时间表是在 a.txt 文件中创建的。我希望打开该文件并在记事本中自动显示给我。如何在c中编程？
回答by Antti
Dani already described the easier way (using system), so I'll just describe the other (more complicated but also more flexible) way to do it using the Windows API. Browsing the API (Overview -> System Services -> Processes and Threads), there's a small example on how to create a processusing the CreateProcess() function. In your case:
Dani 已经描述了更简单的方法（使用system），因此我将仅描述使用Windows API执行此操作的另一种（更复杂但也更灵活）的方法。浏览 API（概览 -> 系统服务 -> 进程和线程），有一个关于如何使用 CreateProcess() 函数创建进程的小示例。在你的情况下：
CreateProcess("notepad.exe", // Name of program to execute
"aa.txt", // Command line
NULL, // Process handle not inheritable
NULL, // Thread handle not inheritable
FALSE, // Set handle inheritance to FALSE
0, // No creation flags
NULL, // Use parent's environment block
NULL, // Use parent's starting directory
&si, // Pointer to STARTUPINFO structure
&pi); // Pointer to PROCESS_INFORMATION structure
And then wait for the Notepad process to exit, as described in the example.
然后等待记事本进程退出，如示例中所述。
回答by Dani
Use
用
system("notepad.exe aa.txt");
回答by Matteo Italia
Third way: use the ShellExecuteshell function telling to the shell to "just open the file" with the default editor:
第三种方式：使用ShellExecuteshell 函数告诉 shell 使用默认编辑器“只打开文件”：
#include <windows.h>
#include <Shellapi.h>
// ...
if(ShellExecute(
NULL, // No parent window for error message boxes/...
"open", // Shell action ("verb") to be performed on the file (as opposed to "print", "explore", ...)
"aa.txt", // File to be opened
NULL, // Command-line parameters - not used when opening documents
NULL, // Working directory - the current one is used by default
SW_SHOW // State of the window of the application being launched - SW_SHOW is the default
)<=(HINSTANCE)32 // If ShellExecute returns a value <=32 it means that an error has occurred
)
{
puts("Cannot open aa.txt with the default editor - ShellExecute failed.");
}
This will open aa.txtwith the default editor for txtfiles.
这将aa.txt使用txt文件的默认编辑器打开。
In my opinion, this is the best solution:
在我看来，这是最好的解决方案：
it respects the user's choice for the editor (unlike
CreateProcess, which just opensnotepad.exe); if I set PSPad as the default editor for txt files, it will pop up PSPad and not notepad.it doesn't have problems with search paths for the editor (where is
notepad.exe?)its behavior is fully defined, unlike the
systemfunction, which relies oncommand.com/cmd.exe, which have subtle differences between Windows versions and don't give you any documented/easy way to check if the operation succeeded;it doesn't give you any "false feeling of portability" like the
system, that will happily compile on a Linux machine but will simply not work at runtime.
它尊重用户对编辑器的选择（与
CreateProcess刚刚打开的 不同notepad.exe）；如果我将 PSPad 设置为 txt 文件的默认编辑器，它会弹出 PSPad 而不是记事本。编辑器的搜索路径没有问题（在哪里
notepad.exe？）它的行为是完全定义的，与
system依赖于command.com/的函数cmd.exe不同，它在 Windows 版本之间存在细微的差异，并且没有为您提供任何记录/简单的方法来检查操作是否成功；它不会像 那样给您任何“可移植性的错误感觉”
system，它可以在 Linux 机器上愉快地编译，但在运行时根本无法工作。
