C++ 如何执行此DirectFB示例？
我从表单中获得了以下directFB示例代码： 我正在使用DFB1.4.11（我无法更新当前项目）。如何运行此示例？（新手） --更新 更新行后（如@jclin所述）： 结果是：C++ 如何执行此DirectFB示例？,c++,g++,directfb,C++,G++,Directfb,我从表单中获得了以下directFB示例代码： 我正在使用DFB1.4.11（我无法更新当前项目）。如何运行此示例？（新手） --更新 更新行后（如@jclin所述）： 结果是： $ g++ Test01HorizontalLine.cpp -I /usr/local/include/directfb/ /tmp/cc6iUS1W.o: In function `main': Test01HorizontalLine.cpp:(.text+0x1c): undefined reference t
$ g++ Test01HorizontalLine.cpp -I /usr/local/include/directfb/
/tmp/cc6iUS1W.o: In function `main':
Test01HorizontalLine.cpp:(.text+0x1c): undefined reference to `DirectFBInit'
Test01HorizontalLine.cpp:(.text+0x61): undefined reference to `DirectFBErrorFatal'
Test01HorizontalLine.cpp:(.text+0x6d): undefined reference to `DirectFBCreate'
Test01HorizontalLine.cpp:(.text+0xb2): undefined reference to `DirectFBErrorFatal'
Test01HorizontalLine.cpp:(.text+0x111): undefined reference to `DirectFBErrorFatal'
Test01HorizontalLine.cpp:(.text+0x188): undefined reference to `DirectFBErrorFatal'
Test01HorizontalLine.cpp:(.text+0x1ef): undefined reference to `DirectFBErrorFatal'
Test01HorizontalLine.cpp:(.text+0x26d): undefined reference to `DirectFBErrorFatal'
/tmp/cc6iUS1W.o:Test01HorizontalLine.cpp:(.text+0x2e4): more undefined references to `DirectFBErrorFatal' follow
collect2: ld returned 1 exit status
你能试试这个吗，因为我现在没有这样的版本
dsc.caps = DFBSurfaceCapabilities(DSCAPS_PRIMARY | DSCAPS_FLIPPING);
...
primary->Flip(primary, NULL, DFBSurfaceFlipFlags(0));
以下代码适用于我的测试ubuntu12，我可能与您有不同的directfb，但应该是类似的：
#include <stdio.h>
#include <unistd.h>
#include <directfb/directfb.h>
static IDirectFB *dfb = NULL;
static IDirectFBSurface *primary = NULL;
static int screen_width = 0;
static int screen_height = 0;
#define DFBCHECK(x...) \
{ \
DFBResult err = x; \
\
if (err != DFB_OK) \
{ \
fprintf( stderr, "%s <%d>:\n\t", __FILE__, __LINE__ ); \
DirectFBErrorFatal( #x, err ); \
} \
}
int main(int argc, char **argv) {
DFBSurfaceDescription dsc;
DFBCHECK(DirectFBInit (&argc, &argv));
DFBCHECK(DirectFBCreate (&dfb));
DFBCHECK(dfb->SetCooperativeLevel (dfb, DFSCL_FULLSCREEN));
dsc.flags = DSDESC_CAPS;
dsc.caps = DFBSurfaceCapabilities(DSCAPS_PRIMARY | DSCAPS_FLIPPING);
DFBCHECK(dfb->CreateSurface( dfb, &dsc, &primary ));
DFBCHECK(primary->GetSize (primary, &screen_width, &screen_height));
DFBCHECK(primary->FillRectangle (primary, 0, 0, screen_width, screen_height));
DFBCHECK(primary->SetColor (primary, 0x80, 0x80, 0xff, 0xff));
DFBCHECK(primary->DrawLine (primary, 0, screen_height / 2, screen_width - 1, screen_height / 2));
primary->Flip(primary, NULL, DFBSurfaceFlipFlags(0));
sleep(5);
primary->Release(primary);
dfb->Release(dfb);
return 23;
}
find-L-ldirectfb$ find /usr/lib -name libdirectfb.so
~~~~~~~~~~~~~~~~~~~~~~~~~~| DirectFB 1.2.10 |~~~~~~~~~~~~~~~~~~~~~~~~~~
(c) 2001-2008 The world wide DirectFB Open Source Community
(c) 2000-2004 Convergence (integrated media) GmbH
----------------------------------------------------------------
(*) DirectFB/Core: Single Application Core. (2012-05-21 06:43)
(!) Direct/Util: opening '/dev/fb0' failed
--> Permission denied
(!) DirectFB/FBDev: Error opening framebuffer device!
(!) DirectFB/FBDev: Use 'fbdev' option or set FRAMEBUFFER environment variable.
(!) DirectFB/Core: Could not initialize 'system_core' core!
--> Initialization error!
Test01HorizontalLine.cpp <24>:
(#) DirectFBError [DirectFBCreate (&dfb)]: Initialization error!
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ DirectFB 1.2.10|~~~~~~~~~~~~~~~~~~~~~~~~~~
（c） 2001-2008全球DirectFB开源社区
（c） 2000-2004 Convergence（集成媒体）有限公司
----------------------------------------------------------------
（*）DirectFB/Core：单应用程序核心。(2012-05-21 06:43)
（！）Direct/Util:打开“/dev/fb0”失败
-->拒绝许可
（！）DirectFB/FBDev:打开帧缓冲区设备时出错！
（！）DirectFB/FBDev:使用“FBDev”选项或设置帧缓冲区环境变量。
（！）DirectFB/Core:无法初始化“system_Core”Core！
-->初始化错误！
Test01HorizontalLine.cpp：
（#）DirectFBError[DirectFBCreate（&dfb）]：初始化错误！
另外，最好使用-Wall选项查看更多有关正在发生的事情的信息。谢谢您的提示！现在看来问题变了。。。请参阅我的更新。是否指定了GCC的链接路径和库-ldirectfb-L/路径到\u directfb\u lib/谢谢！（奖励@KBart完整的编译行）感谢完整的编译行（太多的东西要包括…）
#include <stdio.h>
#include <unistd.h>
#include <directfb/directfb.h>
static IDirectFB *dfb = NULL;
static IDirectFBSurface *primary = NULL;
static int screen_width = 0;
static int screen_height = 0;
#define DFBCHECK(x...) \
{ \
DFBResult err = x; \
\
if (err != DFB_OK) \
{ \
fprintf( stderr, "%s <%d>:\n\t", __FILE__, __LINE__ ); \
DirectFBErrorFatal( #x, err ); \
} \
}
int main(int argc, char **argv) {
DFBSurfaceDescription dsc;
DFBCHECK(DirectFBInit (&argc, &argv));
DFBCHECK(DirectFBCreate (&dfb));
DFBCHECK(dfb->SetCooperativeLevel (dfb, DFSCL_FULLSCREEN));
dsc.flags = DSDESC_CAPS;
dsc.caps = DFBSurfaceCapabilities(DSCAPS_PRIMARY | DSCAPS_FLIPPING);
DFBCHECK(dfb->CreateSurface( dfb, &dsc, &primary ));
DFBCHECK(primary->GetSize (primary, &screen_width, &screen_height));
DFBCHECK(primary->FillRectangle (primary, 0, 0, screen_width, screen_height));
DFBCHECK(primary->SetColor (primary, 0x80, 0x80, 0xff, 0xff));
DFBCHECK(primary->DrawLine (primary, 0, screen_height / 2, screen_width - 1, screen_height / 2));
primary->Flip(primary, NULL, DFBSurfaceFlipFlags(0));
sleep(5);
primary->Release(primary);
dfb->Release(dfb);
return 23;
}
g++ -o testHorizonLine Test01HorizontalLine.cpp -I/usr/include \
-I/usr/include/directfb -L/usr/lib/i386-linux-gnu -ldirectfb
$ find /usr/lib -name libdirectfb.so
~~~~~~~~~~~~~~~~~~~~~~~~~~| DirectFB 1.2.10 |~~~~~~~~~~~~~~~~~~~~~~~~~~
(c) 2001-2008 The world wide DirectFB Open Source Community
(c) 2000-2004 Convergence (integrated media) GmbH
----------------------------------------------------------------
(*) DirectFB/Core: Single Application Core. (2012-05-21 06:43)
(!) Direct/Util: opening '/dev/fb0' failed
--> Permission denied
(!) DirectFB/FBDev: Error opening framebuffer device!
(!) DirectFB/FBDev: Use 'fbdev' option or set FRAMEBUFFER environment variable.
(!) DirectFB/Core: Could not initialize 'system_core' core!
--> Initialization error!
Test01HorizontalLine.cpp <24>:
(#) DirectFBError [DirectFBCreate (&dfb)]: Initialization error!
g++ your_source_file.cpp -I /path/to/include -L/path/to/lib -ldirectfb