Java 在JNA中传递参数
此代码填充生成的数据结构SCANNER\u FULL\u PLUS\u EX,然后调用函数ScanReadFull\u PlusEx()。这两个文件都是由jnavior生成的,应该创建一些文件,如Scan\u F.bmp等 对于windows 10 6位上的64位java,字节[512]中的文件名无法正确传递到dll。大多数情况下,文件名都是nullJava 在JNA中传递参数,java,jna,Java,Jna,此代码填充生成的数据结构SCANNER\u FULL\u PLUS\u EX,然后调用函数ScanReadFull\u PlusEx()。这两个文件都是由jnavior生成的,应该创建一些文件,如Scan\u F.bmp等 对于windows 10 6位上的64位java,字节[512]中的文件名无法正确传递到dll。大多数情况下,文件名都是null public short SCANTEST(String fileName) { StringBuilder Bitma
public short SCANTEST(String fileName) {
StringBuilder BitmapNameF = new StringBuilder();
StringBuilder BitmapNameR = new StringBuilder();
StringBuilder BitmapNameF_IR = new StringBuilder();
StringBuilder BitmapNameR_IR = new StringBuilder();
StringBuilder BitmapNameF_UV = new StringBuilder();
StringBuilder BitmapNameR_UV = new StringBuilder();
SCANNER_FULL_PLUS_EX m_ScanFullPlusEx = new SCANNER_FULL_PLUS_EX();
m_ScanFullPlusEx.Version = 0;
m_ScanFullPlusEx.BrightnessFront = 100;
m_ScanFullPlusEx.ThresholdFront = 100;
m_ScanFullPlusEx.BrightnessRear = 100;
m_ScanFullPlusEx.ThresholdRear = 100;
m_ScanFullPlusEx.BitsPerPixel = 8;
m_ScanFullPlusEx.ScanMode = 2;
m_ScanFullPlusEx.ScanModeIR = 0;
m_ScanFullPlusEx.ScanModeUV = 0;
m_ScanFullPlusEx.dwImageWidth = 0;
m_ScanFullPlusEx.dwImageHeight = 0;
m_ScanFullPlusEx.pImageFront = new NativeLong(0);
m_ScanFullPlusEx.dwImageSizeFront = 0;
m_ScanFullPlusEx.pImageRear = new NativeLong(0);
m_ScanFullPlusEx.dwImageSizeRear = 0;
m_ScanFullPlusEx.pIR_ImageFront = new NativeLong(0);
m_ScanFullPlusEx.dwIR_ImageSizeFront = 0;
m_ScanFullPlusEx.pIR_ImageRear = new NativeLong(0);
m_ScanFullPlusEx.dwIR_ImageSizeRear = 0;
m_ScanFullPlusEx.pUV_ImageFront = new NativeLong(0);
m_ScanFullPlusEx.dwUV_ImageSizeFront = 0;
m_ScanFullPlusEx.pUV_ImageRear = new NativeLong(0);
m_ScanFullPlusEx.dwUV_ImageSizeRear = 0;
BitmapNameF.append(fileName + "F.bmp");
BitmapNameR.append(fileName + "R.bmp");
BitmapNameF_IR.append(fileName + "F_IR.bmp");
BitmapNameR_IR.append(fileName + "R_IR.bmp");
BitmapNameF_UV.append(fileName + "F_UV.bmp");
BitmapNameR_UV.append(fileName + "R_UV.bmp");
m_ScanFullPlusEx.ImageNameRear = Native.toByteArray(BitmapNameR.toString());
m_ScanFullPlusEx.ImageNameFront = Native.toByteArray(BitmapNameF.toString());
m_ScanFullPlusEx.IR_ImageNameFront = Native.toByteArray(BitmapNameF_IR.toString());
m_ScanFullPlusEx.IR_ImageNameRear = Native.toByteArray(BitmapNameR_IR.toString());
m_ScanFullPlusEx.UV_ImageNameFront = Native.toByteArray(BitmapNameF_UV.toString());
m_ScanFullPlusEx.UV_ImageNameRear = Native.toByteArray(BitmapNameR_UV.toString());
// wrap in 512 buffer
byte[] f1 = new byte[512]; for (int i=0; i<m_ScanFullPlusEx.ImageNameRear.length;i++) f1[i]=m_ScanFullPlusEx.ImageNameRear[i]; m_ScanFullPlusEx.ImageNameRear = f1;
byte[] f2 = new byte[512]; for (int i=0; i<m_ScanFullPlusEx.ImageNameFront.length;i++) f2[i]=m_ScanFullPlusEx.ImageNameFront[i]; m_ScanFullPlusEx.ImageNameFront = f2;
byte[] f3 = new byte[512]; for (int i=0; i<m_ScanFullPlusEx.IR_ImageNameFront.length;i++) f3[i]=m_ScanFullPlusEx.IR_ImageNameFront[i]; m_ScanFullPlusEx.IR_ImageNameFront = f3;
byte[] f4 = new byte[512]; for (int i=0; i<m_ScanFullPlusEx.IR_ImageNameRear.length;i++) f4[i]=m_ScanFullPlusEx.IR_ImageNameRear[i]; m_ScanFullPlusEx.IR_ImageNameRear = f4;
byte[] f5 = new byte[512]; for (int i=0; i<m_ScanFullPlusEx.UV_ImageNameFront.length;i++) f5[i]=m_ScanFullPlusEx.UV_ImageNameFront[i]; m_ScanFullPlusEx.UV_ImageNameFront = f5;
byte[] f6 = new byte[512]; for (int i=0; i<m_ScanFullPlusEx.UV_ImageNameRear.length;i++) f6[i]=m_ScanFullPlusEx.UV_ImageNameRear[i]; m_ScanFullPlusEx.UV_ImageNameRear = f6;
short ret = MB2Library.INSTANCE.ScanReadFull_PlusEx(ByteBuffer.wrap(Native.toByteArray(gPort.Global)), m_ScanFullPlusEx, MB2Library.SCAN_OUTPUT_FORMAT_FILE_BMP);
return ret;
}
编辑1:
package mb2;
import java.util.StringTokenizer;
import java.util.Arrays;
import java.util.List;
import com.sun.jna.Library;
import com.sun.jna.Native;
import com.sun.jna.NativeLibrary;
import com.sun.jna.NativeLong;
import com.sun.jna.Pointer;
import com.sun.jna.Structure;
import com.sun.jna.ptr.ByReference;
import com.sun.jna.ptr.PointerByReference;
import com.sun.jna.ptr.IntByReference;
import com.sun.jna.ptr.ByteByReference;
import com.sun.jna.ptr.DoubleByReference;
import com.sun.jna.ptr.FloatByReference;
import com.sun.jna.ptr.LongByReference;
import com.sun.jna.ptr.NativeLongByReference;
import com.sun.jna.ptr.ShortByReference;
public class SCANNER_FULL_PLUS_EX extends Structure {
public int Version;
public int BrightnessFront;
public int ThresholdFront;
public int BrightnessRear;
public int ThresholdRear;
public int BitsPerPixel;
/** Front/Rear/Front-Rear */
public int ScanMode;
/** ( not yet implemented ) IR Front/Rear/Front-Rear */
public int ScanModeIR;
/** ( not yet implemented ) UV Front/Rear/Front-Rear */
public int ScanModeUV;
public int dwImageWidth;
public int dwImageHeight;
/**
* Front CIS Image<br>
* C type : HANDLE
*/
public NativeLong pImageFront;
public int dwImageSizeFront;
/**
* Rear CIS Image<br>
* C type : HANDLE
*/
public NativeLong pImageRear;
public int dwImageSizeRear;
/**
* Front IR Image<br>
* C type : HANDLE
*/
public NativeLong pIR_ImageFront;
public int dwIR_ImageSizeFront;
/**
* Rear IR Image<br>
* C type : HANDLE
*/
public NativeLong pIR_ImageRear;
public int dwIR_ImageSizeRear;
/**
* Front UV Image<br>
* C type : HANDLE
*/
public NativeLong pUV_ImageFront;
public int dwUV_ImageSizeFront;
/**
* Rear UV Image<br>
* C type : HANDLE
*/
public NativeLong pUV_ImageRear;
public int dwUV_ImageSizeRear;
/**
* images path<br>
* C type : TCHAR[512]
*/
public byte[] ImageNameFront = new byte[512];
/** C type : TCHAR[512] */
public byte[] ImageNameRear = new byte[512];
/** C type : TCHAR[512] */
public byte[] IR_ImageNameFront = new byte[512];
/** C type : TCHAR[512] */
public byte[] IR_ImageNameRear = new byte[512];
/** C type : TCHAR[512] */
public byte[] UV_ImageNameFront = new byte[512];
/** C type : TCHAR[512] */
public byte[] UV_ImageNameRear = new byte[512];
public SCANNER_FULL_PLUS_EX() {
super();
}
protected List<String> getFieldOrder() {
return Arrays.asList("Version", "BrightnessFront", "ThresholdFront", "BrightnessRear", "ThresholdRear", "BitsPerPixel", "ScanMode", "ScanModeIR", "ScanModeUV", "dwImageWidth", "dwImageHeight", "pImageFront", "dwImageSizeFront", "pImageRear", "dwImageSizeRear", "pIR_ImageFront", "dwIR_ImageSizeFront", "pIR_ImageRear", "dwIR_ImageSizeRear", "pUV_ImageFront", "dwUV_ImageSizeFront", "pUV_ImageRear", "dwUV_ImageSizeRear", "ImageNameFront", "ImageNameRear", "IR_ImageNameFront", "IR_ImageNameRear", "UV_ImageNameFront", "UV_ImageNameRear");
}
public SCANNER_FULL_PLUS_EX(Pointer peer) {
super(peer);
}
public static class ByReference extends SCANNER_FULL_PLUS_EX implements Structure.ByReference {
};
public static class ByValue extends SCANNER_FULL_PLUS_EX implements Structure.ByValue {
};
}
包mb2;
导入java.util.StringTokenizer;
导入java.util.array;
导入java.util.List;
导入com.sun.jna.Library;
导入com.sun.jna.Native;
导入com.sun.jna.nativellibrary;
导入com.sun.jna.NativeLong;
导入com.sun.jna.Pointer;
导入com.sun.jna.Structure;
导入com.sun.jna.ptr.ByReference;
导入com.sun.jna.ptr.PointerByReference;
导入com.sun.jna.ptr.IntByReference;
导入com.sun.jna.ptr.ByteByReference;
导入com.sun.jna.ptr.DoubleByReference;
导入com.sun.jna.ptr.FloatByReference;
导入com.sun.jna.ptr.LongByReference;
通过引用导入com.sun.jna.ptr.nativelong;
导入com.sun.jna.ptr.ShortByReference;
公共类SCANNER\u FULL\u PLUS\u EX扩展结构{
公共int版本;
公共交通前线;
公共战线;
公共内部照明系统;
公共内部阈值后方;
公共整数比特像素;
/**前/后/前/后*/
公共int扫描模式;
/**(尚未实施)红外前/后/前-后*/
公共int扫描模式;
/**(尚未实施)紫外线前/后/前-后*/
公共int扫描模式;
公共图像宽度;
公共高度;
/**
*前CIS图像
*C型:手柄
*/
公共民族阵线;
公共int dwImageSizeFront;
/**
*后CIS图像
*C型:手柄
*/
公共土生青椒;
公共int dwImageSizeRear;
/**
*前红外图像
*C型:手柄
*/
公共民族阵线;
公共int dwIR_ImageSizeFront;
/**
*后红外图像
*C型:手柄
*/
公共国家公园;
公共int dwIR_ImageSizeRear;
/**
*正面UV图像
*C型:手柄
*/
公共国家广场;
公共int dwUV_ImageSizeFront;
/**
*后部UV图像
*C型:手柄
*/
公共国家公园;
公共int dwUV_ImageSizeRear;
/**
*图像路径
*C类型:TCHAR[512]
*/
公共字节[]ImageNameFront=新字节[512];
/**C类型:TCHAR[512]*/
公共字节[]ImageNameRear=新字节[512];
/**C类型:TCHAR[512]*/
公共字节[]IR_ImageNameFront=新字节[512];
/**C类型:TCHAR[512]*/
公共字节[]IR_ImageNameRear=新字节[512];
/**C类型:TCHAR[512]*/
公共字节[]UV_ImageNameFront=新字节[512];
/**C类型:TCHAR[512]*/
公共字节[]UV_ImageNameRear=新字节[512];
公共扫描仪\u满\u加上\u EX(){
超级();
}
受保护列表getFieldOrder(){
返回数组,“pUV_ImageFront”、“dwUV_ImageSizeFront”、“pUV_ImageRear”、“dwUV_ImageSizeRear”、“ImageNameFront”、“ImageNameRear”、“IR_ImageNameFront”、“IR_ImageNameRear”、“UV_ImageNameFront”、“UV_ImageNameRear”);
}
公共扫描仪\u满\u加上\u EX(指针对等){
超级(对等);
}
公共静态类ByReference扩展SCANNER\u FULL\u PLUS\u EX实现结构。ByReference{
};
公共静态类ByValue扩展了SCANNER\u FULL\u PLUS\u EX实现Structure.ByValue{
};
}
欢迎来到人类的奇妙世界
您仅与字符串参数一起使用。这将返回:
使用getDefaultStringEncoding()返回的编码,与给定字符串等效的以NUL结尾的字节缓冲区
在字符串和字节数组之间转换时,不指定编码通常是一种不好的做法。在这种情况下,您实际上希望使用默认的系统编码,但指定该编码很有用,并且在此过程中,了解它在做什么
默认的Windows编码是UTF-16,它使用16位来表示字符(wchar\u t
在C中)。对于ASCII字符串,就像您正在使用的字符串一样,这意味着您的字节数组以交替的0字节和8位字符字节结束。(请随意插入代码并输出Arrays.toString(f1)
亲自看一下!)
C结构使用的数组。这可以是单个字节,也可以是两个字节,具体取决于您的编码(这将匹配Native.toByteArray()
)
因此,这里的默认编码很好,只是您需要知道该编码是什么,以便正确调整结构的大小。您正在传递512字节数组,而您可能需要512-TCHAR数组(1024字节)
但是,JNA结构必须知道它们的总字节大小,并且JNA中没有映射TCHAR
。因此,您必须计算CHAR\u WIDTH
,然后将512乘以结构中的该值。(在JNA源代码中搜索CHAR\u WIDTH
,以获取这方面的示例。)
(编辑1)
感谢您提供了JNA映射。通常,当JNA映射的函数/结构出现错误时,首先要看的是类型映射。在您的情况下,除了如上所述的不正确的TCHAR
到byte
的映射之外,您还将句柄
映射为NativeLong
。这不正确在Windows上工作:HANDLE
扩展自PointerType
,指针匹配操作系统位,64位Windows上的64位也是如此。Windowspackage mb2;
import java.util.StringTokenizer;
import java.util.Arrays;
import java.util.List;
import com.sun.jna.Library;
import com.sun.jna.Native;
import com.sun.jna.NativeLibrary;
import com.sun.jna.NativeLong;
import com.sun.jna.Pointer;
import com.sun.jna.Structure;
import com.sun.jna.ptr.ByReference;
import com.sun.jna.ptr.PointerByReference;
import com.sun.jna.ptr.IntByReference;
import com.sun.jna.ptr.ByteByReference;
import com.sun.jna.ptr.DoubleByReference;
import com.sun.jna.ptr.FloatByReference;
import com.sun.jna.ptr.LongByReference;
import com.sun.jna.ptr.NativeLongByReference;
import com.sun.jna.ptr.ShortByReference;
public class SCANNER_FULL_PLUS_EX extends Structure {
public int Version;
public int BrightnessFront;
public int ThresholdFront;
public int BrightnessRear;
public int ThresholdRear;
public int BitsPerPixel;
/** Front/Rear/Front-Rear */
public int ScanMode;
/** ( not yet implemented ) IR Front/Rear/Front-Rear */
public int ScanModeIR;
/** ( not yet implemented ) UV Front/Rear/Front-Rear */
public int ScanModeUV;
public int dwImageWidth;
public int dwImageHeight;
/**
* Front CIS Image<br>
* C type : HANDLE
*/
public NativeLong pImageFront;
public int dwImageSizeFront;
/**
* Rear CIS Image<br>
* C type : HANDLE
*/
public NativeLong pImageRear;
public int dwImageSizeRear;
/**
* Front IR Image<br>
* C type : HANDLE
*/
public NativeLong pIR_ImageFront;
public int dwIR_ImageSizeFront;
/**
* Rear IR Image<br>
* C type : HANDLE
*/
public NativeLong pIR_ImageRear;
public int dwIR_ImageSizeRear;
/**
* Front UV Image<br>
* C type : HANDLE
*/
public NativeLong pUV_ImageFront;
public int dwUV_ImageSizeFront;
/**
* Rear UV Image<br>
* C type : HANDLE
*/
public NativeLong pUV_ImageRear;
public int dwUV_ImageSizeRear;
/**
* images path<br>
* C type : TCHAR[512]
*/
public byte[] ImageNameFront = new byte[512];
/** C type : TCHAR[512] */
public byte[] ImageNameRear = new byte[512];
/** C type : TCHAR[512] */
public byte[] IR_ImageNameFront = new byte[512];
/** C type : TCHAR[512] */
public byte[] IR_ImageNameRear = new byte[512];
/** C type : TCHAR[512] */
public byte[] UV_ImageNameFront = new byte[512];
/** C type : TCHAR[512] */
public byte[] UV_ImageNameRear = new byte[512];
public SCANNER_FULL_PLUS_EX() {
super();
}
protected List<String> getFieldOrder() {
return Arrays.asList("Version", "BrightnessFront", "ThresholdFront", "BrightnessRear", "ThresholdRear", "BitsPerPixel", "ScanMode", "ScanModeIR", "ScanModeUV", "dwImageWidth", "dwImageHeight", "pImageFront", "dwImageSizeFront", "pImageRear", "dwImageSizeRear", "pIR_ImageFront", "dwIR_ImageSizeFront", "pIR_ImageRear", "dwIR_ImageSizeRear", "pUV_ImageFront", "dwUV_ImageSizeFront", "pUV_ImageRear", "dwUV_ImageSizeRear", "ImageNameFront", "ImageNameRear", "IR_ImageNameFront", "IR_ImageNameRear", "UV_ImageNameFront", "UV_ImageNameRear");
}
public SCANNER_FULL_PLUS_EX(Pointer peer) {
super(peer);
}
public static class ByReference extends SCANNER_FULL_PLUS_EX implements Structure.ByReference {
};
public static class ByValue extends SCANNER_FULL_PLUS_EX implements Structure.ByValue {
};
}
private static final int CHAR_WIDTH = Boolean.getBoolean("w32.ascii") ? 1 : 2;