Mercurial > projects > dwt-win
annotate dwt/dnd/ByteArrayTransfer.d @ 320:da968414c383
Merge changes SWT 3.4.1
author | Frank Benoit <benoit@tionex.de> |
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date | Mon, 03 Nov 2008 21:58:40 +0100 |
parents | fd9c62a2998e |
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1 /******************************************************************************* |
246 | 2 * Copyright (c) 2000, 2008 IBM Corporation and others. |
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3 * All rights reserved. This program and the accompanying materials |
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4 * are made available under the terms of the Eclipse Public License v1.0 |
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5 * which accompanies this distribution, and is available at |
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6 * http://www.eclipse.org/legal/epl-v10.html |
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7 * |
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8 * Contributors: |
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9 * IBM Corporation - initial API and implementation |
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10 * Port to the D programming language: |
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11 * Frank Benoit <benoit@tionex.de> |
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12 *******************************************************************************/ |
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13 module dwt.dnd.ByteArrayTransfer; |
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14 |
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15 import dwt.internal.ole.win32.COM; |
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16 import dwt.internal.ole.win32.OBJIDL; |
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17 import dwt.internal.win32.OS; |
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18 |
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19 import dwt.dnd.DND; |
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20 import dwt.dnd.Transfer; |
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21 import dwt.dnd.TransferData; |
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22 |
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23 import dwt.dwthelper.utils; |
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24 |
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25 /** |
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26 * The class <code>ByteArrayTransfer</code> provides a platform specific |
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27 * mechanism for converting a java <code>byte[]</code> to a platform |
246 | 28 * specific representation of the byte array and vice versa. |
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29 * |
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30 * <p><code>ByteArrayTransfer</code> is never used directly but is sub-classed |
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31 * by transfer agents that convert between data in a java format such as a |
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32 * <code>String</code> and a platform specific byte array. |
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33 * |
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34 * <p>If the data you are converting <b>does not</b> map to a |
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35 * <code>byte[]</code>, you should sub-class <code>Transfer</code> directly |
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36 * and do your own mapping to a platform data type.</p> |
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37 * |
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38 * <p>The following snippet shows a subclass of ByteArrayTransfer that transfers |
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39 * data defined by the class <code>MyType</code>.</p> |
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40 * |
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41 * <pre><code> |
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42 * public class MyType { |
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43 * public String fileName; |
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44 * public long fileLength; |
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45 * public long lastModified; |
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46 * } |
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47 * </code></pre> |
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48 * |
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49 * <pre><code> |
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50 * public class MyTypeTransfer extends ByteArrayTransfer { |
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51 * |
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52 * private static final String MYTYPENAME = "my_type_name"; |
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53 * private static final int MYTYPEID = registerType(MYTYPENAME); |
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54 * private static MyTypeTransfer _instance = new MyTypeTransfer(); |
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55 * |
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56 * private MyTypeTransfer() {} |
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57 * |
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58 * public static MyTypeTransfer getInstance () { |
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59 * return _instance; |
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60 * } |
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61 * public void javaToNative (Object object, TransferData transferData) { |
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62 * if (object is null || !(object instanceof MyType[])) return; |
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63 * |
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64 * if (isSupportedType(transferData)) { |
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65 * MyType[] myTypes = (MyType[]) object; |
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66 * try { |
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67 * // write data to a byte array and then ask super to convert to pMedium |
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68 * ByteArrayOutputStream out = new ByteArrayOutputStream(); |
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69 * DataOutputStream writeOut = new DataOutputStream(out); |
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70 * for (int i = 0, length = myTypes.length; i < length; i++){ |
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71 * byte[] buffer = myTypes[i].fileName.getBytes(); |
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72 * writeOut.writeInt(buffer.length); |
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73 * writeOut.write(buffer); |
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74 * writeOut.writeLong(myTypes[i].fileLength); |
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75 * writeOut.writeLong(myTypes[i].lastModified); |
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76 * } |
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77 * byte[] buffer = out.toByteArray(); |
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78 * writeOut.close(); |
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79 * |
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80 * super.javaToNative(buffer, transferData); |
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81 * |
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82 * } catch (IOException e) { |
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83 * } |
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84 * } |
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85 * } |
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86 * public Object nativeToJava(TransferData transferData){ |
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87 * |
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88 * if (isSupportedType(transferData)) { |
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89 * |
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90 * byte[] buffer = (byte[])super.nativeToJava(transferData); |
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91 * if (buffer is null) return null; |
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92 * |
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93 * MyType[] myData = new MyType[0]; |
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94 * try { |
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95 * ByteArrayInputStream in = new ByteArrayInputStream(buffer); |
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96 * DataInputStream readIn = new DataInputStream(in); |
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97 * while(readIn.available() > 20) { |
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98 * MyType datum = new MyType(); |
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99 * int size = readIn.readInt(); |
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100 * byte[] name = new byte[size]; |
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101 * readIn.read(name); |
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102 * datum.fileName = new String(name); |
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103 * datum.fileLength = readIn.readLong(); |
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104 * datum.lastModified = readIn.readLong(); |
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105 * MyType[] newMyData = new MyType[myData.length + 1]; |
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106 * System.arraycopy(myData, 0, newMyData, 0, myData.length); |
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107 * newMyData[myData.length] = datum; |
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108 * myData = newMyData; |
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109 * } |
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110 * readIn.close(); |
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111 * } catch (IOException ex) { |
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112 * return null; |
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113 * } |
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114 * return myData; |
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115 * } |
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116 * |
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117 * return null; |
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118 * } |
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119 * protected String[] getTypeNames(){ |
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120 * return new String[]{MYTYPENAME}; |
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121 * } |
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122 * protected int[] getTypeIds(){ |
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123 * return new int[] {MYTYPEID}; |
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124 * } |
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125 * } |
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126 * </code></pre> |
246 | 127 * |
128 * @see Transfer | |
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129 */ |
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130 public abstract class ByteArrayTransfer : Transfer { |
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131 |
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132 public TransferData[] getSupportedTypes() { |
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133 int[] types = getTypeIds(); |
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134 TransferData[] data = new TransferData[types.length]; |
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135 for (int i = 0; i < types.length; i++) { |
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136 data[i] = new TransferData(); |
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137 data[i].type = types[i]; |
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138 data[i].formatetc = new FORMATETC(); |
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139 data[i].formatetc.cfFormat = types[i]; |
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140 data[i].formatetc.dwAspect = COM.DVASPECT_CONTENT; |
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141 data[i].formatetc.lindex = -1; |
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142 data[i].formatetc.tymed = COM.TYMED_HGLOBAL; |
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143 } |
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144 return data; |
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145 } |
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146 |
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147 public bool isSupportedType(TransferData transferData){ |
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148 if (transferData is null) return false; |
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149 int[] types = getTypeIds(); |
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150 for (int i = 0; i < types.length; i++) { |
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151 FORMATETC* format = transferData.formatetc; |
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152 if (format.cfFormat is types[i] && |
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153 (format.dwAspect & COM.DVASPECT_CONTENT) is COM.DVASPECT_CONTENT && |
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154 (format.tymed & COM.TYMED_HGLOBAL) is COM.TYMED_HGLOBAL ) |
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155 return true; |
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156 } |
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157 return false; |
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158 } |
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159 |
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160 /** |
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161 * This implementation of <code>javaToNative</code> converts a java |
246 | 162 * <code>byte[]</code> to a platform specific representation. |
163 * | |
135
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164 * @param object a java <code>byte[]</code> containing the data to be converted |
246 | 165 * @param transferData an empty <code>TransferData</code> object that will |
166 * be filled in on return with the platform specific format of the data | |
167 * | |
168 * @see Transfer#nativeToJava | |
135
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169 */ |
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170 protected void javaToNative (Object object, TransferData transferData) { |
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171 if (!checkByteArray(object) || !isSupportedType(transferData)) { |
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172 DND.error(DND.ERROR_INVALID_DATA); |
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173 } |
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174 // Allocate the memory because the caller (DropTarget) has not handed it in |
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175 // The caller of this method must release the data when it is done with it. |
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176 byte[] data = (cast(ArrayWrapperByte)object).array; |
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177 int size = data.length; |
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178 auto newPtr = OS.GlobalAlloc(OS.GMEM_FIXED | OS.GMEM_ZEROINIT, size); |
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179 OS.MoveMemory(newPtr, data.ptr, size); |
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180 transferData.stgmedium = new STGMEDIUM(); |
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181 transferData.stgmedium.tymed = COM.TYMED_HGLOBAL; |
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182 transferData.stgmedium.unionField = newPtr; |
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183 transferData.stgmedium.pUnkForRelease = null; |
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184 transferData.result = COM.S_OK; |
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185 } |
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186 |
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187 /** |
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188 * This implementation of <code>nativeToJava</code> converts a platform specific |
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189 * representation of a byte array to a java <code>byte[]</code>. |
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190 * |
246 | 191 * @param transferData the platform specific representation of the data to be converted |
192 * @return a java <code>byte[]</code> containing the converted data if the conversion was | |
193 * successful; otherwise null | |
194 * | |
195 * @see Transfer#javaToNative | |
135
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196 */ |
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197 protected Object nativeToJava(TransferData transferData) { |
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198 if (!isSupportedType(transferData) || transferData.pIDataObject is null) return null; |
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199 |
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200 IDataObject data = transferData.pIDataObject; |
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201 data.AddRef(); |
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202 FORMATETC* formatetc = transferData.formatetc; |
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203 STGMEDIUM* stgmedium = new STGMEDIUM(); |
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204 stgmedium.tymed = COM.TYMED_HGLOBAL; |
320 | 205 transferData.result = getData(data, formatetc, stgmedium); |
135
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206 data.Release(); |
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207 if (transferData.result !is COM.S_OK) return null; |
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208 auto hMem = stgmedium.unionField; |
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209 int size = OS.GlobalSize(hMem); |
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210 byte[] buffer = new byte[size]; |
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211 auto ptr = OS.GlobalLock(hMem); |
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212 OS.MoveMemory(buffer.ptr, ptr, size); |
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213 OS.GlobalUnlock(hMem); |
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214 OS.GlobalFree(hMem); |
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215 return new ArrayWrapperByte(buffer); |
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216 } |
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217 |
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218 bool checkByteArray(Object object) { |
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219 return (object !is null && ( null !is cast(ArrayWrapperByte)object) && (cast(ArrayWrapperByte)object).array.length > 0); |
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220 } |
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221 } |