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In Command Prompt, this works: whatever\folder> bezier.exe

but this doesn't: whatever> folder\bezier.exe

My bezier program loads some settings from a local file, so I believe the problem is that the program thinks its directory is whatever\ when it is actually whatever\folder\. I'm calling it from within a C program using CreateProcess(). If I am correct in guessing the problem, is there any way to ensure the program has the right directory for itself?


the main method of bezier.exe:

int main(int argc, char* argv[]) {
char buf[200];
FILE* f = fopen("out.txt","w");
GetCurrentDirectory(200,buf);
fprintf(f,buf);
fclose(f);

SDL_Surface* screen;
SDL_Event e;

SDL_Init(SDL_INIT_VIDEO);
screen = SDL_SetVideoMode(WIDTH, HEIGHT, 32, SDL_FULLSCREEN|SDL_HWSURFACE);
if (screen == NULL)
    exit(-1);
SDL_ShowCursor(SDL_DISABLE);

srand(time(NULL));

loadColors(COLOR_FILE);

fill(screen, backColor);
initialiseVars();

while (e.type != SDL_KEYDOWN)
{
        //do stuff
}

SDL_Quit();
return 0;

}

Here's the crazy part. With "..> folder\bezier.exe" it doesn't write its path, but it does start a new window. That doesn't make any sense to me, because SDL_SetVideoMode is after writing the path.

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1 に答える 1

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You can use GetModuleHandle and GetModuleFileName to find out where your execuatble file is, then use that information to create a file specification for your local settings file.

GetModuleHandle with a NULL argument will give you the handle for the current executable. Then, passing that to GetModuleFileName will give you the fully qualified name of that executable. Just strip off the executable filename from the end and add your configuration file name.

However, that's been a bad idea for a long time now, since Windows provides per-application and per-user settings areas for this sort of stuff - you can generally get those locations with SHGetFolderLocation() and its brethren.

Use the first method only if this is for a personal project. If you plan to release your software to the wild, you should separate executable and configuration information as per Microsoft guidelines.

Regardless of that, it appears you now have the problem that you think the file is not being written to. You need to check that. When you open that file out.txt for write, it does so in the current directory. If you're running in the parent directory (with folder\bezier.exe), it will create it in the parent directory and looking for it in the folder directory is a waste of time.

If you are looking in the directory where you're running the program from, and it's still not being created, there are possible reasons for this. For a start, you should check (ie, capture and output) the return codes from all those f* functions, fopen, fprintf and fclose.

于 2012-09-11T03:30:26.880 に答える