Java call native methods in a DLL without JNI (Call PageSetupDlg function in comdlg32.dll)

最近由于项目的要求，需要在SWT程序中打印自定义的表格，并能设置页面和页面空白的大小。

再查看了SWT的文档后发现， SWT只封装了PrintDLG打印对话框，可以设置页面的大小，但不能设置页面空白的大小。
由于本人以前是VB程序员，本能的就想到了comdlg32.dll 中的PageSetupDlg对话框。如果可以直接调用这个对话框，省掉了多少麻烦事啊。

但是用JNI调用dll中的函数也很麻烦，还不如自己做一个页面设置对话框来的方便。于是查了一下sourceforge，发现了JNative这个类库。在稍稍看了JNative的源码之后觉得这个库写的真是不错。封装了许多Win32 api中的类型（HWND，DWORD， LPARAM 等等）方便使用，并且直接wrapper了不少dll （比如 Gdi32， Kernel32， Shell32， User32等dll），其中居然也包括ComDlg32 （可惜只封装了ChooseColor 颜色选择对话框）。

不过不要紧，既然有了ChooseColor的例子，那我们就自己动手调用PageSetupDlg吧。

先查一下msdn，看一看PageSetupDlg函数的用法

BOOL PageSetupDlg(

LPPAGESETUPDLG lppsd

);

PAGESETUPDLG Structure:

typedef struct tagPSD {
    DWORD lStructSize;
    HWND hwndOwner;
    HGLOBAL hDevMode;
    HGLOBAL hDevNames;
    DWORD Flags;
    POINT ptPaperSize;
    RECT rtMinMargin;
    RECT rtMargin;
    HINSTANCE hInstance;
    LPARAM lCustData;
    LPPAGESETUPHOOK lpfnPageSetupHook;
    LPPAGEPAINTHOOK lpfnPagePaintHook;
    LPCTSTR lpPageSetupTemplateName;
    HGLOBAL hPageSetupTemplate;
} PAGESETUPDLG, *LPPAGESETUPDLG;

其中有两个结构RECT，和 POINT是Jnative 没有封装的，我们先封装这两个结构：

POINT.java

RECT.java

1 /**
2  *
3  */
4 package de.ikoffice.ktableextension.printer;
5
6 import org.xvolks.jnative.exceptions.NativeException;
7 import org.xvolks.jnative.misc.basicStructures.AbstractBasicData;
8 import org.xvolks.jnative.misc.basicStructures.LONG;
9 import org.xvolks.jnative.pointers.Pointer;
10 import org.xvolks.jnative.pointers.memory.GlobalMemoryBlock;
11
12 /**
13  * @author Jun Huang
14  *
15  * The Gosurf Development Team
16  */
17 public class RECT extends AbstractBasicData<RECT> {
18     LONG left;
19     LONG top;
20     LONG right;
21     LONG bottom;
22
23
24     protected RECT() throws NativeException {
25         super(null);
26         mValue = this;
27         createPointer();
28     }
29
30     /* (non-Javadoc)
31      * @see org.xvolks.jnative.misc.basicStructures.BasicData#createPointer()
32      */
33     public Pointer createPointer() throws NativeException {
34         pointer = new Pointer(new GlobalMemoryBlock(getSizeOf()));
35         return pointer;
36     }
37
38     /* (non-Javadoc)
39      * @see org.xvolks.jnative.misc.basicStructures.BasicData#getSizeOf()
40      */
41     public int getSizeOf() {
42         return 16;
43     }
44
45     /* (non-Javadoc)
46      * @see org.xvolks.jnative.misc.basicStructures.BasicData#getValueFromPointer()
47      */
48     public RECT getValueFromPointer() throws NativeException {
49         offset = 0;
50         left = new LONG(getNextInt());
51         top = new LONG(getNextInt());
52         right = new LONG(getNextInt());
53         bottom = new LONG(getNextInt());
54
55         return getValue();
56     }
57
58     public void setLeft(LONG left) throws NativeException {
59         this.left = left;
60         pointer.setIntAt(0, left.getValue());
61     }
62
63     public void setTop(LONG top) throws NativeException {
64         this.top = top;
65         pointer.setIntAt(4, top.getValue());
66     }
67
68     public void setRight(LONG right) throws NativeException {
69         this.right = right;
70         pointer.setIntAt(8, right.getValue());
71     }
72
73     public void setBottom(LONG bottom) throws NativeException {
74         pointer.setIntAt(12, bottom.getValue());
75     }
76
77
78
79 }
80

然后封装PAGESETDLG结构
PAGESETUPDLG.java

  1 package de.ikoffice.ktableextension.printer;
  2
  3 import org.xvolks.jnative.exceptions.NativeException;
  4 import org.xvolks.jnative.misc.basicStructures.AbstractBasicData;
  5 import org.xvolks.jnative.misc.basicStructures.HWND;
  6 import org.xvolks.jnative.misc.basicStructures.LONG;
  7 import org.xvolks.jnative.misc.basicStructures.LPARAM;
  8 import org.xvolks.jnative.pointers.NullPointer;
  9 import org.xvolks.jnative.pointers.Pointer;
10 import org.xvolks.jnative.pointers.memory.GlobalMemoryBlock;
11 import org.xvolks.jnative.util.Callback;
12
13 /**
14  * @author Jun Huang
15  *
16  * The Gosurf Development Team
17  *
18  */
19 public class PAGESETUPDLG extends AbstractBasicData<PAGESETUPDLG> {
20
21     LONG lStrurtSize;
22     HWND hwndOwner;
23     static Pointer hDevMode = new NullPointer();
24     static Pointer hDevNames = new NullPointer();
25     LONG flags;
26     POINT ptPaperSize;
27     RECT rtMinMargin;
28     RECT rtMargin;
29     HWND hInstance;
30     LPARAM lCustData;
31     Callback lpfnPageSetupHook;
32     Callback lpfnPagePaintHook;
33     Pointer lpPageSetupTemplateName;
34     static Pointer hPageSetupTemplate = new NullPointer();
35
36
37     public PAGESETUPDLG() throws NativeException {
38         super(null);
39         mValue = this;
40         createPointer();
41     }
42
43     public void removeCallback() throws NativeException {
44         //TODO
45     }
46
47     public void addCallback(Callback lCallback) throws NativeException {
48         removeCallback();
49
50         //TODO
51     }
52
53     public void setHwndOwner(HWND hwndOwner) throws NativeException {
54         this.hwndOwner = hwndOwner;
55         pointer.setIntAt(4, hwndOwner.getValue());
56     }
57
58     public void setFlags(LONG flags) throws NativeException {
59         this.flags = flags;
60         pointer.setIntAt(16, flags.getValue());
61     }
62
63     public void setHInstance(HWND instance) throws NativeException {
64         hInstance = instance;
65         pointer.setIntAt(60, instance.getValue());
66     }
67
68     public void setLCustData(LPARAM custData) throws NativeException {
69         lCustData = custData;
70         pointer.setIntAt(64, lCustData.getValue());
71     }
72
73     public void setLpPageSetupTemplateName(String lpPageSetupTemplateName) {
74
75         this.lpPageSetupTemplateName = new NullPointer();
76
77     }
78
79     /* (non-Javadoc)
80      * @see org.xvolks.jnative.misc.basicStructures.BasicData#createPointer()
81      */
82     public Pointer createPointer() throws NativeException {
83         pointer = new Pointer(new GlobalMemoryBlock(getSizeOf()));
84         pointer.setIntAt(0, getSizeOf());
85         pointer.setIntAt(8, hDevMode.getPointer());
86         pointer.setIntAt(12, hDevNames.getPointer());
87         return pointer;
88     }
89
90     /* (non-Javadoc)
91      * @see org.xvolks.jnative.misc.basicStructures.BasicData#getSizeOf()
92      */
93     public int getSizeOf() {
94
95         return 84;
96     }
97
98     /* (non-Javadoc)
99      * @see org.xvolks.jnative.misc.basicStructures.BasicData#getValueFromPointer()
100      */
101     public PAGESETUPDLG getValueFromPointer() throws NativeException {
102         offset = 0;
103         lStrurtSize = new LONG(getNextInt());    // 0
104         hwndOwner = new HWND(getNextInt());     // 4
105
106         //Skip hDevMode
107         offset += 4;                             // 8
108
109         //Skip hDevNames
110         offset += 4;                            // 12
111
112         flags = new LONG(getNextInt());          // 16
113
114         //ptPaperSize
115         ptPaperSize = new POINT();                // 20
116         ptPaperSize.setX(new LONG(getNextInt()));
117         ptPaperSize.setY(new LONG(getNextInt()));
118
119         //rtMinMargin                        // 28
120         rtMinMargin = new RECT();
121         rtMinMargin.setLeft(new LONG(getNextInt()));
122         rtMinMargin.setTop(new LONG(getNextInt()));
123         rtMinMargin.setRight(new LONG(getNextInt()));
124         rtMinMargin.setBottom(new LONG(getNextInt()));
125
126         //rtMargin                            // 44
127         rtMargin = new RECT();
128         rtMargin.setLeft(new LONG(getNextInt()));
129         rtMargin.setTop(new LONG(getNextInt()));
130         rtMargin.setRight(new LONG(getNextInt()));
131         rtMargin.setBottom(new LONG(getNextInt()));
132
133         hInstance = new HWND(getNextInt());        // 60
134
135         lCustData = new LPARAM(getNextInt());     // 64
136
137         //Skip lpfnPageSetupHook;                // 68
138         offset += 4;
139
140         //Skip lpfnPagePaintHook;                // 72;
141         offset += 4;
142
143         //Skip lpPageSetupTemplateName;            // 76;
144         offset += 4;
145
146         //Skip hPageSetupTemplate;                // 80;
147         offset += 4;
148
149         // 84
150
151         return getValue();
152
153     }
154
155 }

我们所希望的返回值是页面大小和页面空白大小：
PageSetupResult.java

1 /**
2  *
3  */
4 package de.ikoffice.ktableextension.printer;
5
6 /**
7  * @author Jun Huang
8  *
9  * The Gosurf Development Team
10  *
11  */
12 public class PageSetupResult {
13
14     public final static int LEFT = 0;
15     public final static int TOP = 1;
16     public final static int RIGHT = 2;
17     public final static int BOTTOM = 3;
18
19     private boolean ret = false;
20     private int[] margins = new int[4];
21     private int pageWidth = 0;
22     private int pageHeight = 0;
23
24     public PageSetupResult() {
25         ret = false;
26         for (int i=0; i<=BOTTOM; i++) {
27             margins[i] = 2500;
28         }
29     }
30
31     public boolean isRet() {
32         return ret;
33     }
34
35     public int[] getMargins() {
36         return margins;
37     }
38
39     public void setRet(boolean ret) {
40         this.ret = ret;
41     }
42
43     public void setMargins(int[] margins) {
44         this.margins = margins;
45     }
46
47     public void setMargin(int position, int mm) {
48         this.margins[position] = mm;
49     }
50
51     public int getMargin(int position) {
52         return margins[position];
53     }
54
55     public int getPageWidth() {
56         return pageWidth;
57     }
58
59     public int getPageHeight() {
60         return pageHeight;
61     }
62
63     public void setPageWidth(int pageWidth) {
64         this.pageWidth = pageWidth;
65     }
66
67     public void setPageHeight(int pageHeight) {
68         this.pageHeight = pageHeight;
69     }
70
71 }
72

万事俱备，现在就可以点用PageSetupDlg函数了
ComDlg32Ex.java

1 package de.ikoffice.ktableextension.printer;
2
3 import org.xvolks.jnative.JNative;
4 import org.xvolks.jnative.Type;
5 import org.xvolks.jnative.exceptions.NativeException;
6 import org.xvolks.jnative.misc.basicStructures.HWND;
7 import org.xvolks.jnative.misc.basicStructures.LONG;
8 import org.xvolks.jnative.misc.basicStructures.LPARAM;
9 import org.xvolks.jnative.util.ComDlg32;
10
11 /**
12  * @author Jun Huang
13  *
14  * The Gosurf Development Team
15  */
16 public class ComDlg32Ex extends ComDlg32 {
17     //Cache the JNative object between calls.
18     private static JNative nPageSetupDlg;
19     public final static int PSD_MINMARGINS = 0x1;
20     public final static int PSD_MARGINS = 0x2;
21     public final static int PSD_INTHOUSANDTHSOFINCHES = 0x4;
22     public final static int PSD_INHUNDREDTHSOFMILLIMETERS = 0x8;
23
24
25     public static PageSetupResult PageSetupDlg(HWND lOwner, HWND hInstance, LONG Flags, LPARAM lCustData) throws NativeException, IllegalAccessException {
26         PageSetupResult ret = new PageSetupResult();
27
28         if(nPageSetupDlg == null) {
29             //JNative uses ANSI version ChooseColorA vs ChooseColorW
30             nPageSetupDlg = new JNative(DLL_NAME, "PageSetupDlgA");
31             //BOOL is in fact an INT
32             nPageSetupDlg.setRetVal(Type.INT);
33         }
34         PAGESETUPDLG nPageSetupDlgStruct = new PAGESETUPDLG();
35         nPageSetupDlgStruct.setHwndOwner(lOwner);
36         nPageSetupDlgStruct.setHInstance(hInstance);
37         nPageSetupDlgStruct.setFlags(Flags);
38         nPageSetupDlgStruct.setLCustData(lCustData);
39
40         nPageSetupDlg.setParameter(0, nPageSetupDlgStruct.getPointer());
41         nPageSetupDlg.invoke();
42
43         if("0".equals(nPageSetupDlg.getRetVal())) {
44             ret.setRet(false);
45             return ret;
46         }
47
48         ret.setRet(true);
49         ret.setMargin(PageSetupResult.LEFT, nPageSetupDlgStruct.getValueFromPointer().rtMargin.getValueFromPointer().left.getValue());
50         ret.setMargin(PageSetupResult.TOP, nPageSetupDlgStruct.getValueFromPointer().rtMargin.getValueFromPointer().top.getValue());
51         ret.setMargin(PageSetupResult.RIGHT, nPageSetupDlgStruct.getValueFromPointer().rtMargin.getValueFromPointer().right.getValue());
52         ret.setMargin(PageSetupResult.BOTTOM, nPageSetupDlgStruct.getValueFromPointer().rtMargin.getValueFromPointer().bottom.getValue());
53         ret.setPageWidth(nPageSetupDlgStruct.getValueFromPointer().ptPaperSize.getValueFromPointer().x.getValue());
54         ret.setPageHeight(nPageSetupDlgStruct.getValueFromPointer().ptPaperSize.getValueFromPointer().y.getValue());
55
56         return ret;
57     }
58
59     public static void main(String[] args) throws NativeException, IllegalAccessException {
60         PageSetupResult result = ComDlg32Ex.PageSetupDlg(new HWND(0), new HWND(0), new LONG(ComDlg32Ex.PSD_INHUNDREDTHSOFMILLIMETERS), new LPARAM(0));
61         System.out.println("The width of page: " + result.getPageWidth()+" mm");
62         System.out.println("The height of page: " + result.getPageHeight()+" mm");
63         System.out.println("The left margin of page: " + result.getMargin(PageSetupResult.LEFT) +" mm");
64         System.out.println("The top margin of page: " + result.getMargin(PageSetupResult.TOP) + " mm");
65         System.out.println("The right margin of page: " + result.getMargin(PageSetupResult.RIGHT) + " mm");
66         System.out.println("The bottom margin of page: " + result.getMargin(PageSetupResult.BOTTOM) + " mm");
67     }
68
69
70 }
71

有空的话我尽量把ComDlg32中的对话框补全，有什么问题大家可以一起探讨一下。
源码下载

posted on 2008-08-22 14:52 onkyo 阅读(744) 评论(0) 编辑收藏

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Java call native methods in a DLL without JNI (Call PageSetupDlg function in comdlg32.dll)

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