在Windows操作系统中,当用户按下"PrintScreen"按钮后,Windows自动将当前屏幕的图像拷贝到系统剪贴板中,这时可以通过"画笔"这个小程序将剪贴板中的内容保存成图像文件,可以看出,如果需要将当前屏幕保存下来还是比较麻烦的,能否可以自己编写一个应用程序,自动将当前屏幕的内容保存到一个图像文件中去呢?这个答案是肯定的,本实例应用程序就是利用通用的热键管理DLL库实现的热键功能,在收到热键通知后截取屏幕的内容并保存到bmp文件中。例如我们设置图片保存路径为c:\,热键为F9 + Control,然后按Change按钮设置好热键,那么当我们按下CTRL+F9后,当前界面将以BMP图像文件的格式被保存在C:\目录下。程序编译运行后的界面效果如图一所示:
D/YMovH%
#w@V!o 一、实现方法
U8zCV*ag b4&l=^:e= 热键管理DLL实际上是一个键盘钩子,由它来监视系统的键盘事件。如果有和程序登记符合的按键组合就通知该程序的窗口。为了应用方便,本实例把它做成了一个标准的管理库来为其它的程序通过热键服务,它有两个输出函数:AddHotkey()和DeleteHotkey(),程序只需要调用这两个函数就可以了,如果编译之后不用改变热键,则只需要AddHotkey就可以了。DLL中的所有的全局变量都放在一个共享段中,定义如下:
Vbv)C3ezD FrC)2wX #pragma data_seg("shareddata")
HtV8=.^ HHOOK hHook =NULL; //钩子句柄
Z`<5SHQd UINT nHookCount =0; //挂接的程序数目
_9C,N2a{C static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
$p|Im, static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
8b!xMFF" static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
'*B%&QC- static int KeyCount =0;
UC_o; static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
Rt>mAU$} #pragma data_seg()
;pj,U!{%s\ FsLd&$?T& 关于共享段,有几点重要的说明:一是必须在链接选项里指定该段为共享:一种方法是在project->settings->link->object/library中加上/section:shareddata,rws;第二种方法是在def文件的sections里加上一句shareddata read write shared;第三种指定共享段的方法在程序里加上一句#pragma comment(linker,"section:shareddata,rws")。二是所有的变量必须初始化,否则链接程序会把它放到普通数据段。三是如果不初始化变量,需要在段外用"__declspec(allocate("shareddata")) 变量类型 变量名"的方式定义。
3i1TBhs6 [}HS[($ DLL中的两个输出函数分别用来添加/删除热键,函数代码如下:
&=]!8z= !dq$qUl/ BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
-tIye{ cKey,UCHAR cMask)
3rBID {
Kr?<7vMT5 BOOL bAdded=FALSE;
6of9lO: for(int index=0;index<MAX_KEY;index++){
U+R9bn if(hCallWnd[index]==0){
sJ{r+wY hCallWnd[index]=hWnd;
EU7nS3K)O~ HotKey[index]=cKey;
Z((e-T#, HotKeyMask[index]=cMask;
/dO*t4$ @? bAdded=TRUE;
gO{$p q} KeyCount++;
Y-lwS-Ii break;
l9e=dV:pH }
aJ@lT&. }
M@JW/~p' return bAdded;
d_!}9 }
PhAD:A //删除热键
k[)/,1 BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
0{
_6le] {
#&ei BOOL bRemoved=FALSE;
znDpg{U( for(int index=0;index<MAX_KEY;index++){
$4*gi& if(hCallWnd[index]==hWnd){
\x:} | if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
HQ wrb HS hCallWnd[index]=NULL;
F"cZ$TL] HotKey[index]=0;
cc3/XBo HotKeyMask[index]=0;
Xvk+1:D bRemoved=TRUE;
V>`9ey!U KeyCount--;
UoaWI2 break;
na*Z0y }
f:t j
}
2I|lY>Z }
YeVo=hYH@ return bRemoved;
u1gD*4+ }
;O|u`fAqT "&{.g1i9 4 L
5$=V DLL中的钩子函数如下:
gW^4@q qQIX:HWDKZ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
bc:3 5. {
sy-#Eo#3 BOOL bProcessed=FALSE;
wz{c;v\J^ if(HC_ACTION==nCode)
Z
+O<IF% {
:Gzp
(@<@e if((lParam&0xc0000000)==0xc0000000){// 有键松开
2R
^6L@fw switch(wParam)
OI8}v {
}346uF7C case VK_MENU:
E^A!k=> MaskBits&=~ALTBIT;
I-=Ieq"R9 break;
I0><IaFy case VK_CONTROL:
Sn^M[}we MaskBits&=~CTRLBIT;
lon9oraF' break;
[>U2!4=$M case VK_SHIFT:
:`lP+y?a1 MaskBits&=~SHIFTBIT;
kem(U{m break;
vR>GE?s6 default: //judge the key and send message
rg=Ym. break;
#3{{[i(;i }
xZM4CR9]*C for(int index=0;index<MAX_KEY;index++){
*=!r|UdB. if(hCallWnd[index]==NULL)
)]LP8
J& continue;
(^B=> if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
yqtaQ0F~ {
t@a&& SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
Ino]::ZJ/ bProcessed=TRUE;
$dWYu"2CD }
M ac?HI }
c4r9k-w0E }
NxDVU?@p* else if((lParam&0xc000ffff)==1){ //有键按下
Ct zWdo. switch(wParam)
a, )/D_{1 {
~=t9-AF- case VK_MENU:
'NCx <0* MaskBits|=ALTBIT;
sTep2W.9 break;
G:wO1f6 case VK_CONTROL:
.<xD'54 MaskBits|=CTRLBIT;
H0yM`7[y break;
IS`ADDU[S case VK_SHIFT:
tA,J~|+f: MaskBits|=SHIFTBIT;
94]i|2qj* break;
vS[\j default: //judge the key and send message
4Ss y (gt break;
,H<nNBv3M }
J, +/<Y! for(int index=0;index<MAX_KEY;index++){
"`%UC# if(hCallWnd[index]==NULL)
k,; (`L continue;
83p8:C.Ze if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
#l.s>B4 {
A/fM30 SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
R9D2cu,{ bProcessed=TRUE;
1mR@Bh }
X?JtEQ~> }
Y=O-^fL }
}W[=O:p if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
+
Okw+v for(int index=0;index<MAX_KEY;index++){
AAKc8{ if(hCallWnd[index]==NULL)
x9 n(3Oa continue;
Nez '1 if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
qPJSVo SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
Uyeo0B" //lParam的意义可看MSDN中WM_KEYDOWN部分
0ia-D`^me }
zwP*7u$CH }
[Ls%nz| }
sJl>evw return CallNextHookEx( hHook, nCode, wParam, lParam );
Ir*{IVvej }
'WBhW5@ hstGe>f[6 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
Tu,nX'q]m LfK/wSvWw BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
N=~DSsw BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
)nK+`{;@! 7s2*VKr 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
* kUb[ (Kg)cc[B` LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
TIaiJvo {
S&k/Pc if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
PlgpH'z4$ {
FP0GE //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
:b_hF SaveBmp();
J9y}rGO return FALSE;
jYBiC DD }
;vWJOvM2 …… //其它处理及默认处理
6@FxPi9|# }
w_LkS/ )|5mW n* .<L 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
m")p]B&i= &g0r#K 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
iV\*7 D$w? 二、编程步骤
e ^`La*n +apn3\_ 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
at2)%V) rsw=a_S 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
/7Q9(} )]E?~ $, 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
kK0zb{ oL!C(\ERh 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
t~qAA\p}o P86wRq
5、 添加代码,编译运行程序。
fl4'dv W&3,XFnI_ 三、程序代码
%/!f^PIwX )]\-Uy$x ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
r CUs #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
;rnhv:Iw #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
0fV}n:4Pq #if _MSC_VER > 1000
]{0OPU #pragma once
Tl?jq] #endif // _MSC_VER > 1000
]IDhE{ #ifndef __AFXWIN_H__
^.*zBrFx #error include 'stdafx.h' before including this file for PCH
'I>geW?{QK #endif
A-M6MW #include "resource.h" // main symbols
%xp 69 class CHookApp : public CWinApp
o+- 0`!yj {
8zjJshE/ public:
(I{+% CHookApp();
uNqN &7g // Overrides
N,F[x0&? // ClassWizard generated virtual function overrides
gXY]NWI //{{AFX_VIRTUAL(CHookApp)
U_UN& /f public:
zOy_qozk virtual BOOL InitInstance();
20:![/7:! virtual int ExitInstance();
bJynUZ //}}AFX_VIRTUAL
^^YP kh6sS //{{AFX_MSG(CHookApp)
uOh // NOTE - the ClassWizard will add and remove member functions here.
{ /
,?3 // DO NOT EDIT what you see in these blocks of generated code !
ITz+O=I4R] //}}AFX_MSG
{Z>Mnw"R DECLARE_MESSAGE_MAP()
{qs>yQ6a:- };
`@So6%3Y| LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
"DX2Mu= BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
)d{fDwrx1 BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
/
w[Tu BOOL InitHotkey();
{CX06BP BOOL UnInit();
dChMjaix #endif
Pa?C-Xn^ SXNde@%
{ //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
^#4<~zU #include "stdafx.h"
02YmV% #include "hook.h"
\9}DAM_ #include <windowsx.h>
`1lGAKv #ifdef _DEBUG
>^ E*7Bfp #define new DEBUG_NEW
,=: -&~? #undef THIS_FILE
RQ 8;_)% static char THIS_FILE[] = __FILE__;
&fE2zTz #endif
iAt&927 #define MAX_KEY 100
_auFt"n #define CTRLBIT 0x04
zT>BC}~.b #define ALTBIT 0x02
P]2V~I/X #define SHIFTBIT 0x01
F4IU2_CnPD #pragma data_seg("shareddata")
RP k'1nD HHOOK hHook =NULL;
z00,Vr^m UINT nHookCount =0;
FJn.V1 static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
&7r a static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
c IPOI'3d static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
1I40N[PE) static int KeyCount =0;
|w5,%#AeO$ static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
yl0;Jx? #pragma data_seg()
dq0!.gBT2 HINSTANCE hins;
#K!"/,d@>J void VerifyWindow();
7j88^59 BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
T9Fe!yVA //{{AFX_MSG_MAP(CHookApp)
B`)bo}h // NOTE - the ClassWizard will add and remove mapping macros here.
dk 0} q6~ // DO NOT EDIT what you see in these blocks of generated code!
1Vs>G //}}AFX_MSG_MAP
8d&%H, END_MESSAGE_MAP()
U.Y7]#P: 2WE01D9O CHookApp::CHookApp()
&q#.
> {
L-%'jR // TODO: add construction code here,
OP\L // Place all significant initialization in InitInstance
8Y:x+v5 }
ARG8\qU #5iy^?N"w CHookApp theApp;
oVW>PEgB- LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
yD@1H(yM {
$)d34JM BOOL bProcessed=FALSE;
x~K79Mya if(HC_ACTION==nCode)
k *>"@ {
qqys`. if((lParam&0xc0000000)==0xc0000000){// Key up
I+31:#d switch(wParam)
DWN9_*{ {
k$>5v +r0 case VK_MENU:
1MmEP MaskBits&=~ALTBIT;
{d.K)8\ break;
<(H<*Xf9 case VK_CONTROL:
"2p\/VfA MaskBits&=~CTRLBIT;
A4rkwM break;
Wfy+9"-;s case VK_SHIFT:
=ADOf_n} MaskBits&=~SHIFTBIT;
3[8p,wx break;
ce; zn\ default: //judge the key and send message
T6."j_ break;
:6/$/`I0W }
(H\ `/%Bp for(int index=0;index<MAX_KEY;index++){
Sh?eb if(hCallWnd[index]==NULL)
|sEuhP\A3 continue;
GRaU]Z]ck if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
B#cN'1c {
5"X@<;H% SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
{R_ <m$ bProcessed=TRUE;
z 7+>G/o }
*z.rOY=
8 }
\A)Pcc}7 }
9,JWi{lIv else if((lParam&0xc000ffff)==1){ //Key down
lxr;AJ( switch(wParam)
$PAAmaigi {
#=;vg case VK_MENU:
GLX{EG9Z MaskBits|=ALTBIT;
@th94tk, break;
7_jlNr7uk case VK_CONTROL:
o8v,178 MaskBits|=CTRLBIT;
lJdYR'/Wd break;
uPjp5;V case VK_SHIFT:
>#Xz~xI/I MaskBits|=SHIFTBIT;
Tu5p`p3-j break;
yqVoedN default: //judge the key and send message
g-1j#V`5 break;
/+8VW;4|I }
6>
z{xYat for(int index=0;index<MAX_KEY;index++)
W/}_ y8q {
\ 9iiS(e if(hCallWnd[index]==NULL)
`j!_tE` continue;
f=u +G if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
~*9Ue@ {
1[$zdv{A SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
EU04U bProcessed=TRUE;
E|+<m! }
r-*6#
" }
Jb^{o+s53 }
iz{TSU if(!bProcessed){
E@n~ @|10 for(int index=0;index<MAX_KEY;index++){
s@{~8cHgU if(hCallWnd[index]==NULL)
f-ceDn continue;
/y6f~F if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
SynRi/BRmw SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
\=]`X2Ld }
>(wQx05^D }
!n P4S)A }
}/,Rp/+7] return CallNextHookEx( hHook, nCode, wParam, lParam );
o4J@M{xb_ }
[t$ r)vX {K6Z.-.` BOOL InitHotkey()
[u37Hy_Gi {
#z<#oC5 if(hHook!=NULL){
8DY:a['-d nHookCount++;
q-ko)] return TRUE;
RqP_^tB }
NO@`*:.^Y else
0NKgtH~+ hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
]!@=2kG4 if(hHook!=NULL)
@rDBK] V nHookCount++;
G%;>_E return (hHook!=NULL);
(Y8LyY }
gmgri BOOL UnInit()
}!R*Q`m {
8iOHav4 if(nHookCount>1){
c@"FV,L> nHookCount--;
0"T/a1S7bl return TRUE;
JbS[(+o }
"bF52lLu BOOL unhooked = UnhookWindowsHookEx(hHook);
D,[Nn_N if(unhooked==TRUE){
H9_iTGBQ nHookCount=0;
%7P]:G+Y\ hHook=NULL;
m-ibS: }
&Tj7qlP\ return unhooked;
oz)4YBf }
i*m;kWu, wet[f {c BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
H.E=m0np {
1[u{y{9 q BOOL bAdded=FALSE;
bhIShk[ for(int index=0;index<MAX_KEY;index++){
{wj%WSQj/y if(hCallWnd[index]==0){
<FBBR2 hCallWnd[index]=hWnd;
j/=Tj'S?D HotKey[index]=cKey;
$p4e8j[EJ HotKeyMask[index]=cMask;
W02z}"# bAdded=TRUE;
*fIn<Cc KeyCount++;
: [328X2 break;
B5vLV@>] }
o:W*#dt }
+y8Y@e}> return bAdded;
UH}lKc=t }
<N$ Hb2b Ky,upU BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
\G>C{v; {
LQ4:SV'3 BOOL bRemoved=FALSE;
8b~ for(int index=0;index<MAX_KEY;index++){
{ +w.Z,D" if(hCallWnd[index]==hWnd){
f<VK\%M if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
}u3|w0~c) hCallWnd[index]=NULL;
B=~y(Mb HotKey[index]=0;
T1.U (:: HotKeyMask[index]=0;
5R~M@ bRemoved=TRUE;
P-gj SE|yh KeyCount--;
-d#08\ break;
.24z+|j }
u*P@Nuy6 }
gDLS)4^w }
lGWz return bRemoved;
UCfouQ Cj }
eS@j? Y0y hx9t{Zi void VerifyWindow()
*->*p35 {
JN+7oh]u for(int i=0;i<MAX_KEY;i++){
>4Tk#+%Jj if(hCallWnd
!=NULL){ gggD "alDx
if(!IsWindow(hCallWnd)){ {G x=QNd
hCallWnd=NULL; {TpbUj0
HotKey=0; y-nv#Ejr
HotKeyMask=0;
6A]I" E]5
KeyCount--; 6d;}mhH
} Sv /P:r
_
} gs3(B/";c
} 9GCK3
} SN ?Z7
xO>z
)3A
BOOL CHookApp::InitInstance() iD|~$<9o
{ ZJZSt% r
AFX_MANAGE_STATE(AfxGetStaticModuleState()); OHBCanZZ,
hins=AfxGetInstanceHandle(); Y0|){&PCt
InitHotkey(); IS(F_< .
return CWinApp::InitInstance(); o
[V8h@K)
} K=0xR*ll5
TY %zw6 #p
int CHookApp::ExitInstance() DoQ^caa@
{ Z8bg5%
VerifyWindow(); d}:-Q?
UnInit(); :23S%B~X
return CWinApp::ExitInstance(); ,:L^vG@*
} sGhw23
^SG>VfgC
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file !`?i>k?Q E
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 6#*_d,xQT
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ lPxhqF5pP
#if _MSC_VER > 1000 TaYl[I
#pragma once 8=L"rekV_
#endif // _MSC_VER > 1000 l3 F$5n
ddKP3}
class CCaptureDlg : public CDialog =l/Dc=[
{ K
|=o -
// Construction ~8nR3ki
public: oOND]>
BOOL bTray; KMy"DVqE
BOOL bRegistered; GIEQD$vy
BOOL RegisterHotkey(); +W[f>3`VQ
UCHAR cKey; hO$Gx*e$
UCHAR cMask; ,hI$nF0}p
void DeleteIcon(); )r{Wj*u
void AddIcon(); 3GE;:;8B
UINT nCount; PjBAf'
void SaveBmp(); Izu____
CCaptureDlg(CWnd* pParent = NULL); // standard constructor q:)PfP+
// Dialog Data %8u9:Cl):
//{{AFX_DATA(CCaptureDlg) lmHQ"z 3G
enum { IDD = IDD_CAPTURE_DIALOG }; }WFI/W'
CComboBox m_Key; P!f0&W
BOOL m_bControl; P=,\wM6T|
BOOL m_bAlt; ^$'z#ZN1
BOOL m_bShift; qy pF}Pw
CString m_Path; 2#5Q~
CString m_Number; 9yTdbpY
//}}AFX_DATA ,5Wu
// ClassWizard generated virtual function overrides c]x-mj =
//{{AFX_VIRTUAL(CCaptureDlg) ,yNuz@^
P
public: e< @$(w
virtual BOOL PreTranslateMessage(MSG* pMsg); &PV%=/-J
protected: wg0_J<y]
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support #KoI8U"
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); +|dLR*s
//}}AFX_VIRTUAL ]QJ5JtD-
// Implementation D>{`I'
protected: qB_s<cpn>
HICON m_hIcon; /
S' +
// Generated message map functions
5TpvJ1G
//{{AFX_MSG(CCaptureDlg) Ewkx4,`Ff
virtual BOOL OnInitDialog(); :F"IOPfU5[
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); o?/H<k\5
afx_msg void OnPaint(); F5:xrcyC
afx_msg HCURSOR OnQueryDragIcon(); g$e|y#Ic$
virtual void OnCancel(); Q]=/e7
afx_msg void OnAbout(); !l#aq\:}~e
afx_msg void OnBrowse(); fWA#n
afx_msg void OnChange(); g,iW^M
//}}AFX_MSG d:>^]5cE&
DECLARE_MESSAGE_MAP() ~v\
W[
}; +2:HgW
#endif G|nBja8vm
CB>W# P%
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file [g}#R#Y)
#include "stdafx.h" u8JH~b
#include "Capture.h" Z}0{FwW"4
#include "CaptureDlg.h" ^C~_}/cZ
#include <windowsx.h> 2>X yrG
#pragma comment(lib,"hook.lib") "9[2vdSX
#ifdef _DEBUG j<!dpt
#define new DEBUG_NEW I@VzH(da\
#undef THIS_FILE *A48shfO
static char THIS_FILE[] = __FILE__; }XUI1H]jk
#endif |H5GWZ
O{^
#define IDM_SHELL WM_USER+1 gzhIOeY
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); M __S)
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); '")'h
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; uHacu<$=
class CAboutDlg : public CDialog Q'=7#_
{ Tz6I7S-w
public: Z>R@
CAboutDlg(); Zp[>[1@+
// Dialog Data 6`'g ${U
//{{AFX_DATA(CAboutDlg) I*f@^(
enum { IDD = IDD_ABOUTBOX }; onmkg}&_
//}}AFX_DATA KAE %Wwjr
// ClassWizard generated virtual function overrides CIo`;jt K
//{{AFX_VIRTUAL(CAboutDlg) /,~]1&?}1
protected: E83$(6z
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support JT<JS6vw#
//}}AFX_VIRTUAL <f}:YDY'
// Implementation v~AshmP
protected: 8VU(+%X
//{{AFX_MSG(CAboutDlg) Q~f]?a`
//}}AFX_MSG *^{j!U37s
DECLARE_MESSAGE_MAP() QhTn9S:D
}; 4IOqSB|
@mu{*. &
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) a(fiW%eFb
{ C[TjcHoA
//{{AFX_DATA_INIT(CAboutDlg) .%J<zqk-
//}}AFX_DATA_INIT XD6Kp[s
} QYDI-<.(
YVF@v-v-,
void CAboutDlg::DoDataExchange(CDataExchange* pDX) .i )K#82
{
nXy"
CDialog::DoDataExchange(pDX); # ^,8JRA
//{{AFX_DATA_MAP(CAboutDlg) %kkDitmI{
//}}AFX_DATA_MAP nzAySMD_
} vnbY^ASdw
)~$ejS
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) H 9BqE+
//{{AFX_MSG_MAP(CAboutDlg) gL|
9hvHr[
// No message handlers qD"~5vtLqQ
//}}AFX_MSG_MAP ODpAMt"
END_MESSAGE_MAP() 4\V/A+<W
@pJ;L1sn
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) Ai 8+U)
: CDialog(CCaptureDlg::IDD, pParent) w0=/V[fs
{ $Sm iN'7;
//{{AFX_DATA_INIT(CCaptureDlg) 7?_gm>]a
m_bControl = FALSE; &Nr+-$
m_bAlt = FALSE; 1 Cz}|#U
m_bShift = FALSE; =b )!l9TX
m_Path = _T("c:\\"); [<^ '}-SJ
m_Number = _T("0 picture captured."); MfI+o<{r
nCount=0; e&(Wn2)o
bRegistered=FALSE; 6PWw^Cd
bTray=FALSE; (Cti,g~
//}}AFX_DATA_INIT :zfMRg
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 \G/ZA) t
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); }HbUB$5
} ]$UTMuOQl
\Yv44*I`
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) 4/SltWU
{ t >64^nS
CDialog::DoDataExchange(pDX); -0CL#RzKR
//{{AFX_DATA_MAP(CCaptureDlg) F5UHkv"K&O
DDX_Control(pDX, IDC_KEY, m_Key); u1z!OofN>
DDX_Check(pDX, IDC_CONTROL, m_bControl); Gh3f^PWnc
DDX_Check(pDX, IDC_ALT, m_bAlt); w17{2']
DDX_Check(pDX, IDC_SHIFT, m_bShift); pNQ@aJ
DDX_Text(pDX, IDC_PATH, m_Path); }LWrtmc
DDX_Text(pDX, IDC_NUMBER, m_Number); .v=n-k7
//}}AFX_DATA_MAP ^6CPC@B1
}
{pRa%DF
o/RGz PR
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) ay{]Vqi9
//{{AFX_MSG_MAP(CCaptureDlg) Q"LlBp>t|#
ON_WM_SYSCOMMAND() {@"
F/G+
ON_WM_PAINT() #7J3,EV
ON_WM_QUERYDRAGICON() b!EqYT
ON_BN_CLICKED(ID_ABOUT, OnAbout) d-8g
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) M|.ykA<D
ON_BN_CLICKED(ID_CHANGE, OnChange) QNcl
//}}AFX_MSG_MAP puF*WxU)
END_MESSAGE_MAP() --`W1!jI@
vL;=qkTCQ
BOOL CCaptureDlg::OnInitDialog() 3[kl` *`
{ dr"@2=Z
CDialog::OnInitDialog(); MLDAr dvK
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); ;O .;i,#Z
ASSERT(IDM_ABOUTBOX < 0xF000); M?ElD1#Z
CMenu* pSysMenu = GetSystemMenu(FALSE); Z= pvoTY
if (pSysMenu != NULL) FlH=Pqc
{ $*9:a3>zny
CString strAboutMenu; {]y!2r
strAboutMenu.LoadString(IDS_ABOUTBOX); t |:XSJ9
if (!strAboutMenu.IsEmpty()) s*>B"#En
{ WD7T&i
pSysMenu->AppendMenu(MF_SEPARATOR); sR$/z9w
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); @Y6~;(p
} H"V)dEm
} Q(hAV
SetIcon(m_hIcon, TRUE); // Set big icon v)!^%D
SetIcon(m_hIcon, FALSE); // Set small icon **n109R
m_Key.SetCurSel(0); |e&hm
~R1
RegisterHotkey(); ?=Mg"QU
CMenu* pMenu=GetSystemMenu(FALSE); &!8u4*K5j
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); fd1z
XK#Z2
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); .YIb ny1
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); ~0{F,R.$
return TRUE; // return TRUE unless you set the focus to a control `?(9Bl
} ]=5D98B
l]P3oB}Yo
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) iM{aRFL
{ s|Zv>Qt
if ((nID & 0xFFF0) == IDM_ABOUTBOX) Ni61o?]Nj
{ ?OWJ UmQ
CAboutDlg dlgAbout; sHMZ'9b
dlgAbout.DoModal(); +q~dS.
} h&t9CpTfeJ
else WcE/,<^*
{ G~\=:d=^,`
CDialog::OnSysCommand(nID, lParam); j1P#({z[
} ^WIGd"^
} E#+|.0*!s
6y)NH 8l7
void CCaptureDlg::OnPaint() Hz3KoO &
{ @EB2I+[
if (IsIconic()) JXF@b-c
{ Qw/H7fvh&
CPaintDC dc(this); // device context for painting #ZpR.$`k
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 8u#2M8.5E
// Center icon in client rectangle Q.L.B7'e7
int cxIcon = GetSystemMetrics(SM_CXICON); x]jJ
int cyIcon = GetSystemMetrics(SM_CYICON); ."JtR
CRect rect; VpmD1YSn
GetClientRect(&rect); 7
a_99?J
int x = (rect.Width() - cxIcon + 1) / 2; =G%L:m*
int y = (rect.Height() - cyIcon + 1) / 2; <Yy|.=6 D
// Draw the icon S-KHot ?
dc.DrawIcon(x, y, m_hIcon); =GSe$f?
} Lkl^
`
else JQ]A"xTIa*
{ ~5b^Gvb?
CDialog::OnPaint(); Q !G^CG
} `%S#XJU
} 16R0#Q/{+*
8P3"$2q
HCURSOR CCaptureDlg::OnQueryDragIcon() :f5"w+
{ h1.<\GO
return (HCURSOR) m_hIcon; ORP-@-dap
} X[KHI1@w
MF/@Efjn
]
void CCaptureDlg::OnCancel() B`<K]ut
{ &+zS4)UK
if(bTray) r:Rk!z*
DeleteIcon(); wxSJ
CDialog::OnCancel(); tKKQli4Mn4
} Tg~SGAc
B(h%>mT[
void CCaptureDlg::OnAbout() }MXC0Z~si
{ `PApmS~}
.
CAboutDlg dlg; 'WQ?%da
dlg.DoModal(); s'Wu \r'
} jM!Q
04(
_?QVc0S!
void CCaptureDlg::OnBrowse() 7@uhw">mX
{ *'jI>^o
CString str; KoKd.%
BROWSEINFO bi; DA wUG
char name[MAX_PATH]; w=feXA3-S
ZeroMemory(&bi,sizeof(BROWSEINFO)); WYXh1_nyk
bi.hwndOwner=GetSafeHwnd(); K@>($BX]
bi.pszDisplayName=name; B
EB[K2[9
bi.lpszTitle="Select folder"; I$HO[Z!
bi.ulFlags=BIF_RETURNONLYFSDIRS; <Po$|$_~
LPITEMIDLIST idl=SHBrowseForFolder(&bi); -#<AbT
if(idl==NULL) :ExCGS[
return; vA&MJD{
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); iw\yVd^]:k
str.ReleaseBuffer(); qbD>)}:1
m_Path=str; @Tz}y"VG
if(str.GetAt(str.GetLength()-1)!='\\') ,,HoD~]rd
m_Path+="\\"; ,zVS}!jRhy
UpdateData(FALSE); PJ3M,2H1b.
} !M@jW[s
&\$~
void CCaptureDlg::SaveBmp() ~6Pv5DKq
{ 'B yB1NL
CDC dc; q@[UeXu?pZ
dc.CreateDC("DISPLAY",NULL,NULL,NULL); u%sfHGrH
CBitmap bm; l#bE_PD;
int Width=GetSystemMetrics(SM_CXSCREEN); #G!\MYfQt
int Height=GetSystemMetrics(SM_CYSCREEN); r@u8QhD
bm.CreateCompatibleBitmap(&dc,Width,Height); qN\?cW'
CDC tdc; "el}9OitC
tdc.CreateCompatibleDC(&dc); PT39VI
=
CBitmap*pOld=tdc.SelectObject(&bm); A"i$.dR{
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); Q4ZKgcC
tdc.SelectObject(pOld); Kw=][}d`D
BITMAP btm; ,s`4k?y
bm.GetBitmap(&btm); ]8f$&gw&A
DWORD size=btm.bmWidthBytes*btm.bmHeight; QERj`/g
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); sZPyEIXie
BITMAPINFOHEADER bih; = P$Q;d
bih.biBitCount=btm.bmBitsPixel; pS+hE4D
bih.biClrImportant=0; t Z@OAPRx
bih.biClrUsed=0; (lg~}Jwq
bih.biCompression=0; 2@,rIve
bih.biHeight=btm.bmHeight; Qo\?(EM
bih.biPlanes=1; 8_/,`}9
bih.biSize=sizeof(BITMAPINFOHEADER); ]w_JbFmT
bih.biSizeImage=size; 46U*70
bih.biWidth=btm.bmWidth; Y1G/1Z# 2
bih.biXPelsPerMeter=0; :!yPR
bih.biYPelsPerMeter=0; uj:1_&g
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); ~,7Tj
static int filecount=0; GBY{O2!3u
CString name; *i>hFNLdOM
name.Format("pict%04d.bmp",filecount++); 'U-8w@\Z
name=m_Path+name; ~9Qd83`UH
BITMAPFILEHEADER bfh; gH
yJ~
bfh.bfReserved1=bfh.bfReserved2=0; ?=G{2E.
bfh.bfType=((WORD)('M'<< 8)|'B'); 9Ed=`c
bfh.bfSize=54+size; uCoy~kt292
bfh.bfOffBits=54; *Hz]<b?
CFile bf; I]a [Ngj
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ {Z1KU8tp
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); A1n4R
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); HCT+.n6
bf.WriteHuge(lpData,size); Qs ysy
bf.Close(); *!pn6OJ"Q}
nCount++; OXnTD!m>{
} @r=,:
'Mt
GlobalFreePtr(lpData); 5mX^{V&^
if(nCount==1) mVEIHzk2b
m_Number.Format("%d picture captured.",nCount); kB.CeG]tk
else YJ|U|[
m_Number.Format("%d pictures captured.",nCount); 8jY<S+[o
UpdateData(FALSE); _nM 7SK
} iJ`zWpj+{Q
<G'M/IR a
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) DMOP*;Uk
{ \-SC-c
if(pMsg -> message == WM_KEYDOWN) 7AlL,&+
{ %aV~RB#
if(pMsg -> wParam == VK_ESCAPE) Tp|>(~;ai
return TRUE; hj}PL
if(pMsg -> wParam == VK_RETURN) (3~^zwA
return TRUE; 51tZ:-1!
} 7'#_uAQR
return CDialog::PreTranslateMessage(pMsg); `Tei
} *Nfotv
P EMBh?)g
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) q0DRT4K
{ zI\+]U'
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ P| hwLM
SaveBmp(); G;d3.ml/aZ
return FALSE; DIfQ~O+u
} $f%om)
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ GS7'pTsYH
CMenu pop; hxMV?\MYj
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); m41%?uC/
CMenu*pMenu=pop.GetSubMenu(0); `sDLxgwI
pMenu->SetDefaultItem(ID_EXITICON); !l]_c5
CPoint pt; CI-1>= "OE
GetCursorPos(&pt); "
%qr*|
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); rNurzag
if(id==ID_EXITICON) PT
}J.Dwx
DeleteIcon(); 3 qJ00A
else if(id==ID_EXIT) 7&9w_iCkV
OnCancel(); m'N8[ o|h
return FALSE; *nc3A[B#C
} (G/(w%#7_
LRESULT res= CDialog::WindowProc(message, wParam, lParam); 7XLqP
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) G&@dJ &B
AddIcon(); I ~^Xw7
return res; $VB
dd~f
} )2#&l
KVh#"]<WV
void CCaptureDlg::AddIcon() H=\Tse_.
{
`6lOq H
NOTIFYICONDATA data; _/'VD!(MV
data.cbSize=sizeof(NOTIFYICONDATA); D.Cn`O}
CString tip; lSlZ^.&
tip.LoadString(IDS_ICONTIP); F" M
data.hIcon=GetIcon(0); cTS.yN({G
data.hWnd=GetSafeHwnd(); em5~4;&'
strcpy(data.szTip,tip); D4C:%D
data.uCallbackMessage=IDM_SHELL; wy
.96
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; @}:E{J#g
data.uID=98; {Z7ixc523
Shell_NotifyIcon(NIM_ADD,&data); S3i p?9
ShowWindow(SW_HIDE); [ZC\8tP`V
bTray=TRUE; ivn2
} ^,mN-.W
KO~KaN
void CCaptureDlg::DeleteIcon() _ E-\aS{
{ l qwy5#
NOTIFYICONDATA data; rsLkH&aM
data.cbSize=sizeof(NOTIFYICONDATA); 3 o$zT9j
data.hWnd=GetSafeHwnd(); (_8.gS[
data.uID=98; %8h=_(X\7
Shell_NotifyIcon(NIM_DELETE,&data); ('Qq"cn#
ShowWindow(SW_SHOW); RgUQ:
SetForegroundWindow(); "]kzt ux
ShowWindow(SW_SHOWNORMAL); 4L ]4WVc
bTray=FALSE; F[SZwMf29
} c*.
Y]KHCY
void CCaptureDlg::OnChange() >
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{ \#LDX,=
RegisterHotkey(); '*65j
} 4w=v
/WDo
%8|lAMTY7/
BOOL CCaptureDlg::RegisterHotkey() h@\-]zN{
{ R`E:`t4G
UpdateData(); YY :{/0?
UCHAR mask=0; U~)5 {
UCHAR key=0; _h5d~
if(m_bControl) )^AZmUYZ
mask|=4; ,[6Rmsk
if(m_bAlt) Sn4xv2/
mask|=2; bGL} nPo
if(m_bShift) q~
ZUtF
mask|=1; X-fWdoN @-
key=Key_Table[m_Key.GetCurSel()]; Yl>Y.SO
if(bRegistered){ aJf3rHX
DeleteHotkey(GetSafeHwnd(),cKey,cMask); "yh2+97l
bRegistered=FALSE; !j`<iPI7B
} fs;\_E[)
cMask=mask; }BU%<5CQ
cKey=key; pZopdEFDK|
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); F~fBr
return bRegistered; d/j?.\
} ~!~i_L\V
ga/zt-&
四、小结 JygJ4RI%j
,$/Ld76U
本实例通过一个钩子DLL实现了屏幕抓图的功能,它有一个缺陷,那就是只能保存整个屏幕图像,不过读者朋友可以在此基础上,实现屏幕任意区域的抓图功能,具体方法不再赘述,实现起来很容易的了,呵呵。