
我该如何编写C代码microsoft visual c++ 2010 Express?我无法做到.我正在编写一些C代码,但它编译时出错.
请建议一些方法来做到这一点?
我写了这段代码:
#include "jni.h"
#include "stdio.h"
#include "HelloWorld.h"
JNIEXPORT void JNICALL
Java_HelloWorld_print(JNIEnv *env, jobject obj) {
printf("This is a JNI tester");
return;
}
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我收到以下错误:
helloworld.cpp(1):致命错误C1083:无法打开包含文件:'jni.h'没有这样的文件或目录
我怎样才能将窄幅转换string为宽幅string?
我试过这个方法:
string myName;
getline( cin , myName );
wstring printerName( L(myName) ); // error C3861: 'L': identifier not found
wchar_t* WprinterName = printerName.c_str(); // error C2440: 'initializing' : cannot convert from 'const wchar_t *' to 'wchar_t *'
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但我得到上面列出的错误.
为什么我会收到这些错误?我该如何解决它们?
有没有其他方法可以直接将narrow字符串转换为wide字符串?
如何JTable在使用netbeans时添加数据.Netbeans在它的后代码中是这样的:
jTable1 = new javax.swing.JTable();
jTable1.setModel(new javax.swing.table.DefaultTableModel(
new Object [][] {
{null, null},
{null, null},
{null, null},
{null, null}
},
new String [] {
"Name", "Branch"
}
) {
boolean[] canEdit = new boolean [] {
false, false
};
public boolean isCellEditable(int rowIndex, int columnIndex) {
return canEdit [columnIndex];
}
}); // THIS IS THE SNIPPET GENERATED BY NETBEANS
//( I have already created a table using the drag and drop fetaure of netbeans and this is the …Run Code Online (Sandbox Code Playgroud) HTML
<table width="100%">
<tr>
<td width="90%"></td>
<td><a href="#" id="logout"><strong>Logout</strong></a></td>
</tr>
</table>
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CSS
@charset "utf-8";
/* CSS Document */
#logout {
color:#BBB;
}
a:hover {
color:#FFF;
}
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虽然注销的颜色似乎是css中给出的颜色,但是当我将鼠标放在链接上时(白色),颜色不会改变.是什么原因 ?
我必须告诉其他css文件,当鼠标放在它们上面并且它们工作正常时,往往会改变链接的颜色.
JNI中哪些弱全球参考?它与全局引用和本地引用有何不同?
context.xmlTomcat和server.xmlTomcat有什么区别?如果我想添加一个标签,如:
<Resource name="jdbc/MyDs" auth="Container" type="javax.sql.DataSource"
driverClassName="org.apache.derby.jdbc.ClientDriver"
url="jdbc:derby://localhost:1527/my_database;create=true"
username="me" password="me" maxActive="20" maxIdle="10" maxWait="-1" />
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我应该在哪里添加它?
当执行以下方法时:
private void beep_player_1() {
try {
//clip_Player_2.close();
clip_Player_1 = AudioSystem.getClip();
ais = AudioSystem.getAudioInputStream(new File(Constants.Player1_Default_Tone)); // PATH FOR THE .WAV FILE
clip_Player_1.open(ais);
clip_Player_1.loop(0); // PLAY ONCE
}catch(Exception exc) {
System.out.println(exc);
}
}
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LineUnavailableException被抛出。这可能是什么原因?
javax.sound.sampled.LineUnavailableException: line with format PCM_SIGNED 44100.0 Hz, 24 bit, stereo, 6 bytes/frame, little-endian not supported.
Run Code Online (Sandbox Code Playgroud) 如何将jstringJNI C代码中的a 发送给Java接收a String作为参数的函数?
我已经阅读过有关函数之类的信息,callVoidMethodA(....)但它们不接受诸如之类的任何东西jstring。
当我编译以下程序时,我得到错误:
gcc tester.c -o tester
tester.c: In function ‘main’:
tester.c:7:17: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘ptr_X’
tester.c:7:17: error: ‘ptr_X’ undeclared (first use in this function)
tester.c:7:17: note: each undeclared identifier is reported only once for each function it appears in
tester.c:10:17: error: expected ‘=’, ‘,’, ‘;’, ‘asm’ or ‘__attribute__’ before ‘ptr_Y’
tester.c:10:17: error: ‘ptr_Y’ undeclared (first use in this function)
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#include <stdio.h>
int main() {
int x = 10;
int y = 20;
int *restrict ptr_X; …Run Code Online (Sandbox Code Playgroud) 什么:
System.in.read()
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回来?该文件 说:
返回:数据的下一个字节,如果到达流的末尾,则返回-1.
但是,例如,如果我进入:10我回来了49.这是为什么 ?