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Arguments On a Console eMbedded Visual C++ Application

nathanpc Page Icon Posted 2010-04-11 8:38 PM
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Hello,
I'm trying to develop a simple application that will read some files, targeted for Windows CE. For this I'm using Microsoft eMbedded Visual C++ 3. This program(that is for console) will be called like this: 
/Storage Card/Test> coms file.cmss

As you can see, file.cmss is the first argument, but on my main I have a condition to show the help(the normal, how to use the program) if the arguments are smaller than 2: 
if(argc < 2) { 

    showhelp(); 

  return 0; 

}

But when I execute the program on the command-line of Windows CE(using all the necessary arguments) I got the showHelp() content. Then I've checked all the code, but it's entirelly correct. But I think that eVC++ don't use argc and argv[] for arguments, then I want some help on how to determine the arguments on it.

Best Regards,
Nathan Paulino Campos
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mscdex Page Icon Posted 2010-04-11 9:34 PM
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Post the rest of the 'main' method, including the function declaration, as well as the command-line argument examples you are trying.
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nathanpc Page Icon Posted 2010-04-11 9:50 PM
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Here it is: 
int WinMain(int argc,char **argv) { 
    if(argc < 2) {  

        showhelp();  

      return 0;  

    } 

    /* Some more code that I don't want to show */ 

 

  return 0; 

}
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mscdex Page Icon Posted 2010-04-11 10:05 PM
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Yes, your WinMain declaration should look like:
Quote
int WINAPI WinMain(HINSTANCE hInst, HINSTANCE hPrev, LPWSTR lpCmdLine, int sw)

where lpCmdLine is a "Pointer to a null-terminated string that specifies the command line for the application, excluding the program name."

Here is an additional resource which gives a fairly useful overview of WinCE C++ apps.

Edited by mscdex 2010-04-11 10:06 PM
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nathanpc Page Icon Posted 2010-04-11 10:23 PM
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But I have things like this on my WinMain function: 
	for(i=1;i<argc;i++ { 
		if(*argv=='-' || *argv=='/' { 

			switch(argv[1]) { 

				case 'h': 

				case '?': 

					showhelp(); 

					return 0; 

				case 'L': 

					verboselisting=1; 

				case 'l': 

					listfilename=(char*)1; 

					break; 

				case 'd': 

					if(argv[2]) { 

						if(!findlabel(&argv[2])) { 

							p=newlabel(); 

							(*p).name=strdup(&argv[2]); 

							(*p).type=VALUE; 

							(*p).value=1; 

							(*p).line=(char*)1; 

							(*p).pass=0; 

						} 

					} 

					break; 

				default: 

					printf("unknown option: %s\n",argv); 

					break; 

			} 

		} else { 

			if(notoption==0) 

				inputfilename=argv; 

			else if(notoption==1) 

				outputfilename=argv; 

			else if(notoption==2) 

				listfilename=argv; 

			else 

				printf("unused argument: %s\n",argv); 

			notoption++; 

		} 

	}


Then what I need to change?

Remember that if I try to use main instead of WinMain, I got this: 
Deleting intermediate files and output files for project 'ASM - Win32 (WCE ARM) Release'. 

--------------------Configuration: ASM - Win32 (WCE ARM) Release-------------------- 

Compiling... 

main.c 

C:\Documents and Settings\Nathan\Desktop\ASM\celib\inc\cecrt_defs.h(147) : warning C4005: 'fileno' : macro redefinition 

        C:\Windows CE Toolsramas\wce211\MS HPC PRO\include\stdlib.h(332) : see previous definition of 'fileno' 

Linking... 

corelibc.lib(pegwmain.obj) : error LNK2001: unresolved external symbol WinMain 

ARMRel/ASM.exe : fatal error LNK1120: 1 unresolved externals 

Error executing link.exe. 

 

ASM.exe - 2 error(s), 1 warning(s)
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mscdex Page Icon Posted 2010-04-11 11:35 PM
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In your WinMain, simply create an argv array which contains the tokens from lpCmdLine and argc which contains the count of argv (obviously). You may want to create a separate function that does the token array generation if your application may have arguments that are more complex and require more than a simple call to wcstok, using a space character as the delimiter.

Something else I read is that depending on the version of CE, lpCmdLine may not be supplied by the OS. In that case you will have to use GetCommandLine which returns a LPTSTR instead of a LPWSTR.

This SO question may be of particular interest too.
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nathanpc Page Icon Posted 2010-04-13 10:23 PM
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How can I do this?
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technogeist2k9 Page Icon Posted 2010-06-12 1:18 PM
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CommandLineToArgs is the only way I've successfully achieved this. I got the source and header from Embedded CE 5.0 or 6.0 (memory not good on this point)

Here is a snippet of my code (which is a working example) assuming the two files are in your search path. cmdline.cpp & cmdline.h

#include <cmdline.h>

#define MAX_CLARGS
#define MAXSTR 256

int WINAPI WinMain( HINSTANCE hInstance, HINSTANCE hPrevInstance, LPTSTR lpCmdLine, int nCmdShow) {

LPTSTR argv[ MAX_CLARGS ];
int argc;

argc = MAX_CLARGS;
CommandLineToArgs( lpCmdLine, &argc, argv ); /* on return you will have the typical argv[] array + argc, NOTE: argv[0] does not contain the exe name. */



Edited by technogeist2k9 2010-06-12 1:19 PM
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