QT/C++编译RabbitMQ-c
项目需要，在发送和接受数据的时候使用RabbitMQ队列作为中间基站。想要对RabbitMQ有个基本的了解，可以结合官网：http://www.rabbitmq.com/，和这篇博客：http://blog.csdn.net/anzhsoft/article/details/19563091一起来理解。
因为是在Qt中使用，所以需要用RabbitMQ-c，官网没有c语言使用RabbitMQ的详细介绍，上面的博客是使用Python来作为说明的，所以还需另寻他路，自己琢磨琢磨。
准备工作：
1、使用Qt 4.7.4和Qt Creator 2.4.1及其的MinGW：
具体的下载安装请见另一篇博客：Qt中使用Protocol Buffers（一）：使用QT的MinGW + msys编译Protocol Buffers v2.6.1
2、Cmak：
下载：https://cmake.org/download/，当前最新版本3.8.0，下载cmake-3.8.0-win64-x64.zip
安装：解压并将bin目录添加到环境目录中去，安装成功后可以在cmd中输入cmake --version查看cmake的版本，cmake --help查看cmake的帮助
3、RabbitMQ-c：
下载：GitHub上下载：https://github.com/alanxz/rabbitmq-c/，下载rabbitmq-c-master.zip，下载完后解压，就可以开始编译啦
开始编译：
根据RabbitMQ-c的下载地址下面的说明文档进行编译
1、使用cmd进入到RabbitMQ的解压地址，在rabbitmq-c-master文件夹中的cmake文件夹中创建文件夹build，然后输入cmake -G "MinGW Makefiles" -DCMAKE_INSTALL_PREFIX=../../install ../..来配置
cmake表示命令
-G "MinGW Makefiles"表示使用MinGW来生成文件
-DCMAKE_INSTALL_PREFIX=../../install表示在rabbitmq-c-master文件夹中创建（如果没有）install文件夹，并在install的时候将文件存放其中。
../..表示CmakeLists.txt所在的文件夹rabbitmq-c-master的文件夹
配置结果：
在这一步的时候遇到两个错误：
Error1: could not find cmakeroot，解决办法：重新安装cmake
Error2: could not find openssl：
解决办法在这个网站找到：https://zhidao.baidu.com/question/587845628097951765.html，即将CMakeLists.txt文件中的ENABLE_SSL_SUPPORT的ON改成OFF，再删除之前生成的文件重新编译。
正确的编译结果是：
D:\RabbitMQ\rabbitmq-c-master\cmake\build>cmake -G "MinGW Makefiles" -DCMAKE_INSTALL_PREFIX=../../install ../..
-- The C compiler identification is GNU 4.4.0
-- Check for working C compiler: D:/Qt/qtcreator-2.4.1/mingw/bin/gcc.exe
-- Check for working C compiler: D:/Qt/qtcreator-2.4.1/mingw/bin/gcc.exe -- works
-- Detecting C compiler ABI info
-- Detecting C compiler ABI info - done
-- Detecting C compile features
-- Detecting C compile features - done
-- CMAKE_BUILD_TYPE not specified. Creating Release build
-- Found C inline keyword: inline
-- Looking for htonll
-- Looking for htonll - not found
-- Looking for poll
-- Looking for poll - not found
-- Looking for clock_gettime in rt
-- Looking for clock_gettime in rt - not found
-- Looking for posix_spawnp in rt
-- Looking for posix_spawnp in rt - not found
-- Performing Test HAVE_GNU90
-- Performing Test HAVE_GNU90 - Failed
-- Performing Test HAVE_C90
-- Performing Test HAVE_C90 - Failed
-- Could NOT find POPT (missing: POPT_INCLUDE_DIR POPT_LIBRARY)
-- Could NOT find XMLTO (missing: XMLTO_EXECUTABLE)
-- Could NOT find Doxygen (missing: DOXYGEN_EXECUTABLE)
-- Looking for pthread.h
-- Looking for pthread.h - found
-- Looking for pthread_create
-- Looking for pthread_create - not found
-- Looking for pthread_create in pthreads
-- Looking for pthread_create in pthreads - not found
-- Looking for pthread_create in pthread
-- Looking for pthread_create in pthread - found
-- Found Threads: TRUE
-- Building rabbitmq as a shared library - yes
-- Building rabbitmq as a static library - yes
-- Configuring done
-- Generating done
-- Build files have been written to: D:/RabbitMQ/rabbitmq-c-master/cmake/build
2、配置成功后就是编译make，输入make
3、编译成功后就是安装，输入make install：
如果安装成功后再次输入make install就是如下内容：
4、安装成功，可以在install文件夹中查找到以下内容：
bin文件夹：librabbitmq.4.dll
include文件夹：amqp.h、amqp_framing.h、amqp_tcp_socket.h
lib文件夹：liblibrabbitmq.4.a、librabbitmq.4.dll.a
简单实例：（测试安装是否成功）
依然是根据GitHub上面的安装教程，后面接着的running the examples，不过它是用cmd命令行运行的，我直接在Qt中使用。
1、分别建两个工程，控制台类型，一个用来发送一个用来监听
2、分别在每个工程文件的文件夹里添加上三个头文件：amqp.h、amqp_framing.h、amqp_tcp_socket.h和一个静态库文件：librabbitmq.4.dll.a
3、分别在每个工程的.pro文件中添加
LIBS += -L P W D / − l r a b b i t m q . 4 “ − L PWD/ -lrabbitmq.4 “-L PWD/−lrabbitmq.4“−LPWD”是当前目录，即main.cpp所在目录，因为我的librabbitmq.4.dll.a放在当前目录中，所以直接这么写就可以，注意：/后面可以有空格，但是-l和文件之间不能有空格，且文件名中的lib和.dll.a皆省略。
4、编译运行文件会发现不成功，但会生成一个工程文件夹，将librabbitmq.4.dll文件添加到生成的工程文件夹中的debug文件夹中去，再次编译运行即
运行结果：
运行出现的错误：
Logging in：socket is closed，两个可能：
1、检查hostname、prot、exchange、routingkey / bindingkey、user、psw，可能笔误写错。
2、主机的服务器没有开启，导致socket is closed，本例是使用localhost作为服务器，所以还需要在本地下载RabbitMQ的服务端，并打开使用才能成功运行。
rabbitmq-c的使用说明：
1、需要有主机名：hostname、端口号：port、交换机：exchange、路由钥匙：routingkey / 绑定钥匙：bindingkey、用户名：user、密码：psw，我们的实例中默认用户名和密码都是guest。
2、先建立TCP连接：
conn = amqp_new_connection();
socket = amqp_tcp_socket_new(conn);
3、打开建立的TCP连接，使用socket，主机名和端口号：
status = amqp_socket_open(socket, hostname, port);
4、登录：
amqp_login(conn, “/”, 0, 131072, 0, AMQP_SASL_METHOD_PLAIN, “guest”, “guest”);
5、打开信道：
amqp_channel_open(conn, 1);
amqp_get_rpc_reply(conn);
6、开始发送或者监听消息
7、关闭信道、关闭连接、销毁连接：
amqp_channel_close(conn, 1, AMQP_REPLY_SUCCESS);
amqp_connection_close(conn, AMQP_REPLY_SUCCESS);
amqp_destroy_connection(conn);
发送和监听的main.cpp文件分别是：
//发送"Hello World！”消息
#include
#include
//RabbitMQ相关头文件
#include "amqp.h"
#include "amqp_framing.h"
#include "amqp_tcp_socket.h"
void die_on_error(int x, char const *context)
{
if (x < 0) {
fprintf(stderr, "%s: %s\n", context, amqp_error_string2(x));
exit(1);
}
}
void die_on_amqp_error(amqp_rpc_reply_t x, char const *context)
{
switch (x.reply_type) {
case AMQP_RESPONSE_NORMAL:
return;
case AMQP_RESPONSE_NONE:
fprintf(stderr, "%s: missing RPC reply type!\n", context);
break;
case AMQP_RESPONSE_LIBRARY_EXCEPTION:
fprintf(stderr, "%s: %s\n", context, amqp_error_string2(x.library_error));
break;
case AMQP_RESPONSE_SERVER_EXCEPTION:
switch (x.reply.id) {
case AMQP_CONNECTION_CLOSE_METHOD: {
amqp_connection_close_t *m = (amqp_connection_close_t *) x.reply.decoded;
fprintf(stderr, "%s: server connection error %uh, message: %.*s\n",
context,
m->reply_code,
(int) m->reply_text.len, (char *) m->reply_text.bytes);
break;
}
case AMQP_CHANNEL_CLOSE_METHOD: {
amqp_channel_close_t *m = (amqp_channel_close_t *) x.reply.decoded;
fprintf(stderr, "%s: server channel error %uh, message: %.*s\n",
context,
m->reply_code,
(int) m->reply_text.len, (char *) m->reply_text.bytes);
break;
}
default:
fprintf(stderr, "%s: unknown server error, method id 0x%08X\n", context, x.reply.id);
break;
}
break;
}
exit(1);
}
int main(int argc, char *argv[])
{
QCoreApplication a(argc, argv);
//RabbitMQ start
char const *hostname;
int port, status;
char const *exchange;
char const *routingkey;
char const *messagebody;
amqp_socket_t *socket;
amqp_connection_state_t conn;
hostname = "localhost";
port = 5672;
exchange = "amq.direct";
routingkey = "test";
messagebody = "Hello World!";
conn = amqp_new_connection();
socket = amqp_tcp_socket_new(conn);
if (!socket) {
qDebug() << "creating TCP socket";
}
status = amqp_socket_open(socket, hostname, port);
if (status) {
qDebug() << "opening TCP socket";
}
die_on_amqp_error(amqp_login(conn, "/", 0, 131072, 0, AMQP_SASL_METHOD_PLAIN, "guest", "guest"),
"Logging in");
amqp_channel_open(conn, 1);
die_on_amqp_error(amqp_get_rpc_reply(conn), "Opening channel");
{
amqp_basic_properties_t props;
props._flags = AMQP_BASIC_CONTENT_TYPE_FLAG | AMQP_BASIC_DELIVERY_MODE_FLAG;
props.content_type = amqp_cstring_bytes("text/plain");
props.delivery_mode = 2; /* persistent delivery mode */
die_on_error(amqp_basic_publish(conn,
1,
amqp_cstring_bytes(exchange),
amqp_cstring_bytes(routingkey),
0,
0,
&props,
amqp_cstring_bytes(messagebody)),
"Publishing");
}
die_on_amqp_error(amqp_channel_close(conn, 1, AMQP_REPLY_SUCCESS), "Closing channel");
die_on_amqp_error(amqp_connection_close(conn, AMQP_REPLY_SUCCESS), "Closing connection");
die_on_error(amqp_destroy_connection(conn), "Ending connection");
//RabbitMQ end
return a.exec();
}
//监听“Hello World！”消息
#include
#include
//RabbitMQ相关头文件
#include "amqp.h"
#include "amqp_framing.h"
#include "amqp_tcp_socket.h"
void die_on_error(int x, char const *context)
{
if (x < 0) {
fprintf(stderr, "%s: %s\n", context, amqp_error_string2(x));
exit(1);
}
}
void die_on_amqp_error(amqp_rpc_reply_t x, char const *context)
{
switch (x.reply_type) {
case AMQP_RESPONSE_NORMAL:
return;
case AMQP_RESPONSE_NONE:
fprintf(stderr, "%s: missing RPC reply type!\n", context);
break;
case AMQP_RESPONSE_LIBRARY_EXCEPTION:
fprintf(stderr, "%s: %s\n", context, amqp_error_string2(x.library_error));
break;
case AMQP_RESPONSE_SERVER_EXCEPTION:
switch (x.reply.id) {
case AMQP_CONNECTION_CLOSE_METHOD: {
amqp_connection_close_t *m = (amqp_connection_close_t *) x.reply.decoded;
fprintf(stderr, "%s: server connection error %uh, message: %.*s\n",
context,
m->reply_code,
(int) m->reply_text.len, (char *) m->reply_text.bytes);
break;
}
case AMQP_CHANNEL_CLOSE_METHOD: {
amqp_channel_close_t *m = (amqp_channel_close_t *) x.reply.decoded;
fprintf(stderr, "%s: server channel error %uh, message: %.*s\n",
context,
m->reply_code,
(int) m->reply_text.len, (char *) m->reply_text.bytes);
break;
}
default:
fprintf(stderr, "%s: unknown server error, method id 0x%08X\n", context, x.reply.id);
break;
}
break;
}
exit(1);
}
static void dump_row(long count, int numinrow, int *chs)
{
int i;
printf("%08lX:", count - numinrow);
if (numinrow > 0) {
for (i = 0; i < numinrow; i++) {
if (i == 8) {
printf(" :");
}
printf(" %02X", chs[i]);
}
for (i = numinrow; i < 16; i++) {
if (i == 8) {
printf(" :");
}
printf(" ");
}
printf(" ");
for (i = 0; i < numinrow; i++) {
if (isprint(chs[i])) {
printf("%c", chs[i]);
} else {
printf(".");
}
}
}
printf("\n");
}
static int rows_eq(int *a, int *b)
{
int i;
for (i=0; i<16; i++)
if (a[i] != b[i]) {
return 0;
}
return 1;
}
void amqp_dump(void const *buffer, size_t len)
{
unsigned char *buf = (unsigned char *) buffer;
long count = 0;
int numinrow = 0;
int chs[16];
int oldchs[16] = {0};
int showed_dots = 0;
size_t i;
for (i = 0; i < len; i++) {
int ch = buf[i];
if (numinrow == 16) {
int j;
if (rows_eq(oldchs, chs)) {
if (!showed_dots) {
showed_dots = 1;
printf(" .. .. .. .. .. .. .. .. : .. .. .. .. .. .. .. ..\n");
}
} else {
showed_dots = 0;
dump_row(count, numinrow, chs);
}
for (j=0; j<16; j++) {
oldchs[j] = chs[j];
}
numinrow = 0;
}
count++;
chs[numinrow++] = ch;
}
dump_row(count, numinrow, chs);
if (numinrow != 0) {
printf("%08lX:\n", count);
}
}
int main(int argc, char *argv[])
{
QCoreApplication a(argc, argv);
//RabbitMQ start
char const *hostname;
int port, status;
char const *exchange;
char const *bindingkey;
amqp_socket_t *socket = NULL;
amqp_connection_state_t conn;
amqp_bytes_t queuename;
hostname = "localhost";
port = 5672;
exchange = "amq.direct";
bindingkey = "test";
conn = amqp_new_connection();
socket = amqp_tcp_socket_new(conn);
if (!socket) {
qDebug() << "creating TCP socket";
}
status = amqp_socket_open(socket, hostname, port);
if (status) {
qDebug() << "opening TCP socket";
}
die_on_amqp_error(amqp_login(conn, "/", 0, 131072, 0, AMQP_SASL_METHOD_PLAIN, "guest", "guest"),
"Logging in");
amqp_channel_open(conn, 1);
die_on_amqp_error(amqp_get_rpc_reply(conn), "Opening channel");
//大括号指明变量的作用域
{
amqp_queue_declare_ok_t *r = amqp_queue_declare(conn, 1, amqp_empty_bytes, 0, 0, 0, 1,
amqp_empty_table);
die_on_amqp_error(amqp_get_rpc_reply(conn), "Declaring queue");
queuename = amqp_bytes_malloc_dup(r->queue);
if (queuename.bytes == NULL) {
fprintf(stderr, "Out of memory while copying queue name");
return 1;
}
}
amqp_queue_bind(conn, 1, queuename, amqp_cstring_bytes(exchange), amqp_cstring_bytes(bindingkey),
amqp_empty_table);
die_on_amqp_error(amqp_get_rpc_reply(conn), "Binding queue");
amqp_basic_consume(conn, 1, queuename, amqp_empty_bytes, 0, 1, 0, amqp_empty_table);
die_on_amqp_error(amqp_get_rpc_reply(conn), "Consuming");
{
for (;;) {
amqp_rpc_reply_t res;
amqp_envelope_t envelope;
amqp_maybe_release_buffers(conn);
res = amqp_consume_message(conn, &envelope, NULL, 0);
if (AMQP_RESPONSE_NORMAL != res.reply_type) {
break;
}
printf("Delivery %u, exchange %.*s routingkey %.*s\n",
(unsigned) envelope.delivery_tag,
(int) envelope.exchange.len, (char *) envelope.exchange.bytes,
(int) envelope.routing_key.len, (char *) envelope.routing_key.bytes);
if (envelope.message.properties._flags & AMQP_BASIC_CONTENT_TYPE_FLAG) {
printf("Content-type: %.*s\n",
(int) envelope.message.properties.content_type.len,
(char *) envelope.message.properties.content_type.bytes);
}
printf("----\n");
amqp_dump(envelope.message.body.bytes, envelope.message.body.len);
amqp_destroy_envelope(&envelope);
}
}
die_on_amqp_error(amqp_channel_close(conn, 1, AMQP_REPLY_SUCCESS), "Closing channel");
die_on_amqp_error(amqp_connection_close(conn, AMQP_REPLY_SUCCESS), "Closing connection");
die_on_error(amqp_destroy_connection(conn), "Ending connection");
//RabbitMQ end
return a.exec();
}