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java - JNA : Exception_Access_Violation

转载 作者:行者123 更新时间:2023-11-29 09:26:19 25 4
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我用JNA在libpotrace.dll中调用了这个函数,这个函数是:

potrace_state_t *potrace_trace(const potrace_param_t *param,
const potrace_bitmap_t *bm);

库中的参数是:

typedef unsigned long potrace_word;

struct potrace_bitmap_s {
int w, h; /* width and height, in pixels */
int dy; /* words per scanline (not bytes) */
potrace_word *map; /* raw data, dy*h words */
};
typedef struct potrace_bitmap_s potrace_bitmap_t;

struct potrace_param_s {
int turdsize; /* area of largest path to be ignored */
int turnpolicy; /* resolves ambiguous turns in path decomposition */
double alphamax; /* corner threshold */
int opticurve; /* use curve optimization? */
double opttolerance; /* curve optimization tolerance */
potrace_progress_t progress; /* progress callback function */
};
typedef struct potrace_param_s potrace_param_t;

在我的java代码中我有:

public class Potrace_bitmap_t extends Structure{
public int w=36;
public int h=2; /* width and height, in pixels */
public int dy=2; /* words per scanline (not bytes) */
public long [] map =new long[dy*h];
}

public class potrace_param_t extends Structure{
//public static class ByValue extends Nat implements Structure.ByValue { }

public int turdsize=0;
public int turnpolicy=0;
public double alphamax=0;
public int opticurve=0;
public double opttolerance=0;

}

potrace_param_t na=lib.potrace_param_default();/*This function returns a fresh set of tracing parameters, initialized to defaults.
Potrace_bitmap_t bm=new Potrace_bitmap_t();
bm.map[0]=1113215L;
bm.map[1]=4026531840L;
bm.map[2]=3276415L;
bm.map[3]=4026531840L;
Potrace_state_t pt=lib.potrace_trace(na, bm);

当我执行 potrace_trace() 时出现此错误:

An unexpected error has been detected by Java Runtime Environment:

EXCEPTION_ACCESS_VIOLATION (0xc0000005) at pc=0x6504fbee, pid=2728, tid=2436

Java VM: Java HotSpot(TM) Client VM (1.6.0_03-b05 mixed mode, sharing)
Problematic frame:
C [libpotrace.dll+0xfbee]

An error report file with more information is saved as hs_err_pid2728.log

If you would like to submit a bug report, please visit:
http://java.sun.com/webapps/bugreport/crash.jsp

我不明白为什么。谢谢。

最佳答案

Potrace_bitmap_t 的第四个字段应该是一个指针,而不是 64 位值的数组。您缺少 potrace_param_t 的最后一个字段。

关于java - JNA : Exception_Access_Violation,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/947069/

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