如何在 Xcode 中用 C 语言执行文件 I/O？
我使用 Xcode 作为 C 的 IDE。
#include <stdio.h>
int main (int argc, const char * argv[])
{
FILE *file;
int numberTest = 0;
file = fopen("fileTest.dat", "r");
if (file == NULL)
{
printf("File not found!\n");
}
fscanf(file, "%d", &numberTest);
printf("I read the number: %d\n", numberTest);
fclose(file);
return 0;
}
该文件位于我的 Xcode 包中，并且与 HDD 中项目的其余部分位于同一文件夹中。问题是 fopen() 不断返回 NULL。
I am using Xcode as my IDE for C.
#include <stdio.h>
int main (int argc, const char * argv[])
{
FILE *file;
int numberTest = 0;
file = fopen("fileTest.dat", "r");
if (file == NULL)
{
printf("File not found!\n");
}
fscanf(file, "%d", &numberTest);
printf("I read the number: %d\n", numberTest);
fclose(file);
return 0;
}
The file is in my Xcode bundle and is in the same folder as the rest of the project in the HDD. The problem is that fopen() keeps returning NULL.
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您假设启动可执行文件时该文件位于当前工作目录中，但事实可能并非如此，而且这始终是一个错误的假设，即使在某些情况下碰巧是这样。
作为快速修复，您现在可以硬编码文件的绝对路径，例如
You're assuming that the file is in the current working directory when the executable is launched, which it probably isn't, and which is always a bad assumption anyway, even if it happens to be true in some cases.
As a quick fix you can just hard code the absolute path to the file for now, e.g.
找不到该文件，因为运行可执行文件时它不在您的路径上。您需要将该文件添加到您的目标，以便在构建源代码时将其复制到构建目录。
The file is not found because it is not on your path when the executable is run. You will need to add the file to your target so that it is copied to the build directory when you build your sources.