Richard是正确的，这是一个使用 strdup 以取消警告。

Richard is correct, here is an example using strdup to suppress the warnings.

char *input_image = strdup([@"input" UTF8String]);
char *output_image = strdup([@"output" UTF8String]);

char *argv[] = { "convert", input_image, "-resize", "100x100", output_image, NULL };

ConvertImageCommand(AcquireImageInfo(), 2, argv, NULL, AcquireExceptionInfo());

free(input_image);
free(output_image);