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:
es&+5
Sg')w1 一、实现方法
k:`^KtBMl )<IbQH|_ 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:
`[57U,v V>4 !fD= #pragma data_seg("shareddata")
JnV$)EYi HHOOK hHook =NULL; //钩子句柄
*!'00fv UINT nHookCount =0; //挂接的程序数目
R*VZ=i static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
7A3e-51> static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
(:M6*RV static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
\1ys2BX static int KeyCount =0;
F#Z]Xq0r static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
q2&&n6PYW #pragma data_seg()
rQN+x|dKMb %+xh 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。
' G)Wy|* I{B8'n{cN 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:
klv^310 Scxf5x- BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
Y2<Z"D` cKey,UCHAR cMask)
bZ )3{ {
|I85]'K9a BOOL bAdded=FALSE;
q35%t61Lc for(int index=0;index<MAX_KEY;index++){
0v+5&Jk if(hCallWnd[index]==0){
<J[*~v%( hCallWnd[index]=hWnd;
&{ntx~Eq HotKey[index]=cKey;
};29'_.."x HotKeyMask[index]=cMask;
k&yy_r
bAdded=TRUE;
{K_YW KeyCount++;
/0Zwgxt4?7 break;
q\d'}:kfu }
&'T7 ~M: }
w4RP*Da?: return bAdded;
~)sb\o
}
WoesE:NiR //删除热键
W53i5u( BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
0y2iS't
{
|p.mA-81 BOOL bRemoved=FALSE;
YC*S;q for(int index=0;index<MAX_KEY;index++){
q^O{LGN if(hCallWnd[index]==hWnd){
%+>I1G if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
9~Q.[ A hCallWnd[index]=NULL;
k3^S^Bv\ HotKey[index]=0;
7QQ1oPV HotKeyMask[index]=0;
~`8`kk8 bRemoved=TRUE;
f<0-'fGJd KeyCount--;
CZ|Y o break;
&eK8v]|"W }
jO!!. w }
y4P mL }
j~Rh_\>Q return bRemoved;
)]X_')K }
}w"laZ* lZ/Yp~2S G)'cd D1 DLL中的钩子函数如下:
E83{4A4 1=W>zC LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
RHVMlMX {
W#-M| BOOL bProcessed=FALSE;
F-UY~i8 if(HC_ACTION==nCode)
jDy {
.VTHZvyn if((lParam&0xc0000000)==0xc0000000){// 有键松开
a8A8?: switch(wParam)
FkKx~I: {
H }</a%y case VK_MENU:
YuLW]Q?v MaskBits&=~ALTBIT;
Eh8.S)E break;
j
YO# case VK_CONTROL:
v3.JG]zLpP MaskBits&=~CTRLBIT;
eUx|_*` break;
Y~fds#y0 case VK_SHIFT:
S(9fGh MaskBits&=~SHIFTBIT;
]e)<CE2
break;
#}e)*( default: //judge the key and send message
;Fp"]z!Qh+ break;
'.d el7s }
au0)yg*V1 for(int index=0;index<MAX_KEY;index++){
>qAQNX if(hCallWnd[index]==NULL)
NWv1g{M continue;
:;)K>g,b if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
UT]LF#.( {
#Z (B4YO SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
5BTQJa bProcessed=TRUE;
dM#\h*:= }
o!\Vk~Vi& }
AGS?<6W- }
n#bC, else if((lParam&0xc000ffff)==1){ //有键按下
TJ2$
Z switch(wParam)
3 LoB-4u? {
W}a&L case VK_MENU:
cFD(Ap MaskBits|=ALTBIT;
PHZA?>Q7Z break;
C+*: lLY case VK_CONTROL:
NC@OmSR\0 MaskBits|=CTRLBIT;
z.P)
:Er break;
v\0[B jhL? case VK_SHIFT:
W[w8@OCNf MaskBits|=SHIFTBIT;
5A:b
\ break;
1Cp5a2{ default: //judge the key and send message
n\wO[l) break;
Pou`PNvH }
f{k2sU*uBE for(int index=0;index<MAX_KEY;index++){
PgxD?Oi8 if(hCallWnd[index]==NULL)
}\P9$D+ continue;
$(.[b][S if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
ZU7,=B= {
/&cb`^"U^ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
rFdq \BSi bProcessed=TRUE;
wUW+S5"K }
\ec,=7S<Zf }
7 45Uo' }
JX`+b if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
DY0G;L3 for(int index=0;index<MAX_KEY;index++){
zF3fpEKe if(hCallWnd[index]==NULL)
|jO&qT]{ continue;
OUS@)Tyh if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
zD7\Gv SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
kImS'i{A //lParam的意义可看MSDN中WM_KEYDOWN部分
'-S^z"ZrI }
u ; f~ }
Z&/bp 1 }
SA)}---" return CallNextHookEx( hHook, nCode, wParam, lParam );
#3\F<AJ<VB }
u])N^AY"sj 50uNgLs 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
/i"L@t)\t YeptYW@xfw BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
E@Q+[~H } BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
^MKvZ DOP 9ZeTS~i 为了添加应用程序对热键通知事件的响应,程序中用的办法是重载WindowProc()函数,该函数代码如下:
~X*)gS-= mp+
%@n.; LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
4}gqtw: {
q.g<g u] if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
L6J=m#Ld {
s+h`,gg9 //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
BC9rsb SaveBmp();
<Gr{h>b return FALSE;
Qt+ K,LY }
-|"mB"Dc …… //其它处理及默认处理
1|q$Wn:* }
)$]_;JFr uIiE,.Uu} gH(,>}{^K 将屏幕图像保存到BMP文件中的任务是由函数SaveBmp()来完成的,具体实现参见代码部分。另外为了顺利实现屏幕抓图,程序中还实现了"托盘"功能,由于这一部分本书在实例中已经专门介绍过了,所以不再赘述,读者朋友可以参考相关实例。
{^1D|y \%K< S 最后需要提醒读者朋友们注意的是,源程序的编译与使用时要先编译hook.dll并将其放在系统目录(win2000/NT是system32,98/ME是system),然后编译对话框程序运行即可。
#\GWYWkR a=.A/;|0* 二、编程步骤
"z1\I\
^ GxuFO5wz 1、 启动Visual C++,生成一个DLL项目和一个基于对话框的应用程序项目,并将两个项目分别命名为"Hook"和"Capture";
sFT-aLpL@V
R%"wf 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
*"d" y.=ur,Nd 3、 在"Capture"项目中按照图一所示设置对话框的界面,具体设置参见代码部分;
_qR1M):yJ [x
kbzJ 4、 使用Class Wizard在"Capture"项目中添加按钮的鼠标单击消息响应函数,并重载对话框的WindowProc()函数;
#9F=+[L j[.R|I|
5、 添加代码,编译运行程序。
>MauuL,.j 4'cdV0] 三、程序代码
t"cGv32b PeEC|&x ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
=EA*h_"q9 #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
`$ql>k-6C #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
ogtKj"a #if _MSC_VER > 1000
4@&8jZ)a #pragma once
'j 'bhG #endif // _MSC_VER > 1000
{F+7> X #ifndef __AFXWIN_H__
}q^M #error include 'stdafx.h' before including this file for PCH
jSsbLa@ #endif
A36 dj #include "resource.h" // main symbols
K@)Hm\* class CHookApp : public CWinApp
EC<g7_0F {
3P2H!r public:
Gc^w,n[E CHookApp();
NuRxk eEO // Overrides
6FFQoE|n // ClassWizard generated virtual function overrides
6}qp;mR
E] //{{AFX_VIRTUAL(CHookApp)
O-[ lL"T public:
K?+iu|$& virtual BOOL InitInstance();
*yN+Xm8o virtual int ExitInstance();
jjN]*{s //}}AFX_VIRTUAL
_DnZ=&=MA //{{AFX_MSG(CHookApp)
<5%x3e"7u // NOTE - the ClassWizard will add and remove member functions here.
jQxv`H // DO NOT EDIT what you see in these blocks of generated code !
sgW*0o //}}AFX_MSG
{dM18; DECLARE_MESSAGE_MAP()
dMK|l };
JS]6jUB<B LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
/o Q^j'v BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
9D#"Ey BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
V^Z"FwWk BOOL InitHotkey();
6 9_etv BOOL UnInit();
A.8{LY; #endif
hsr,a{B%$ LmE%`qNg //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
2Dgulx5kGZ #include "stdafx.h"
o?BcpWp #include "hook.h"
:s`~m;Y9? #include <windowsx.h>
r-&Rjg #ifdef _DEBUG
klmRU@D #define new DEBUG_NEW
F)Oe;z6 #undef THIS_FILE
Z7a~M3VnZ static char THIS_FILE[] = __FILE__;
KAVe~j" #endif
`irz'/"p #define MAX_KEY 100
}F=scbpXj #define CTRLBIT 0x04
8 h #define ALTBIT 0x02
L 1iA
^x #define SHIFTBIT 0x01
R >f$*T
#pragma data_seg("shareddata")
9.:r;H G HHOOK hHook =NULL;
G;#-CT UINT nHookCount =0;
BQmHYar static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
CV&+^_j'k static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
s
~c_9,JK static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
FRqJ#yd] static int KeyCount =0;
\0?^%CD+@ static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
|)`<D #pragma data_seg()
MHar9)$} HINSTANCE hins;
cBs:7Pnp% void VerifyWindow();
COvcR.*0F BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
}q7rR:g //{{AFX_MSG_MAP(CHookApp)
;;#28nV // NOTE - the ClassWizard will add and remove mapping macros here.
//T1e7) // DO NOT EDIT what you see in these blocks of generated code!
`}<x"f7.z //}}AFX_MSG_MAP
@Cg%7AF END_MESSAGE_MAP()
Z7>pz:, AWsy9 CHookApp::CHookApp()
>1u!(-A {
&Z3g$R 9 // TODO: add construction code here,
s~(!m. R // Place all significant initialization in InitInstance
/o%J /| }
rV;X1x}l r1dP9MT\8 CHookApp theApp;
]U?)_P@} LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
,tqMMBwC~_ {
3Run.Gv\ BOOL bProcessed=FALSE;
V/xGk9L~ if(HC_ACTION==nCode)
eFJ .)Z {
*q**,_?; if((lParam&0xc0000000)==0xc0000000){// Key up
r:.3P switch(wParam)
b'F#Y9 {
R{={7.As+ case VK_MENU:
8NU <lV` MaskBits&=~ALTBIT;
I2"F2(>8K break;
;>%@ case VK_CONTROL:
P|c[EUT MaskBits&=~CTRLBIT;
$d\]s]}` break;
^I2+$ case VK_SHIFT:
mY!os91KoO MaskBits&=~SHIFTBIT;
=SMI,p& break;
-CePtq` default: //judge the key and send message
W:s`;8iM$ break;
++{,1wY\ }
g>].m8DZ' for(int index=0;index<MAX_KEY;index++){
/*Xr^X6 if(hCallWnd[index]==NULL)
Ed6k7 continue;
e\o>(is if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
-36pkC
6
\ {
LEu_RU? SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
k/'>,WE bProcessed=TRUE;
l}\q }7\) }
Js{X33^Ju }
l6kq P }
)g;*u,C else if((lParam&0xc000ffff)==1){ //Key down
{DfXn1Cg0U switch(wParam)
FZdZGK {
CG!7BP\ case VK_MENU:
{k:W?` MaskBits|=ALTBIT;
VSf<(udGr break;
Ky:y1\K1^K case VK_CONTROL:
mQ~0cwo) MaskBits|=CTRLBIT;
v>S[}du break;
VR:4|_o case VK_SHIFT:
xcf`i:\ MaskBits|=SHIFTBIT;
_6O\*|'6 break;
`Ckx~'1M: default: //judge the key and send message
e$
pXnMx7 break;
LHJ}I5zv }
i"4&UJu1; for(int index=0;index<MAX_KEY;index++)
@B e7"Fm {
n*yVfI if(hCallWnd[index]==NULL)
SLGo/I* continue;
mEh([ZnY if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
CGYZEPRR {
hzR1O( SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
2^3N[pM; bProcessed=TRUE;
xJ=@xfr$ }
XXwe/>J }
mT:Z!sS }
"~:AsZ"7 if(!bProcessed){
o=%pR| for(int index=0;index<MAX_KEY;index++){
3kU4?D] if(hCallWnd[index]==NULL)
VgBZ@*z(x continue;
4xYW?s( if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
{`KRr:w SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
!t.*xT4W }
d<,'9/a> }
L+GVB[@3Y }
JJE3\
return CallNextHookEx( hHook, nCode, wParam, lParam );
T ?HG}(2 }
q`u ^ sc Ja`xG{~Y7i BOOL InitHotkey()
#gQaNc? {
h!yI(cY if(hHook!=NULL){
2*[Gm e nHookCount++;
$27QY return TRUE;
N?Nu' }
;1gWz
else
|O!G[|/3 hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
kuX{2h*` if(hHook!=NULL)
q2SlK8`QJ nHookCount++;
bx XNv^ return (hHook!=NULL);
s+omCr|H;A }
\jHHj\LLr. BOOL UnInit()
+xL*`fn {
-%,3qhsd if(nHookCount>1){
RkMs!M nHookCount--;
,JU3w return TRUE;
Q"(*SA+-| }
QGq8r> BOOL unhooked = UnhookWindowsHookEx(hHook);
O~udlVn<6 if(unhooked==TRUE){
LtK= nK nHookCount=0;
m ?)k&{I hHook=NULL;
9$~a&lXO5 }
AuW-XK. return unhooked;
*h V$\CLT. }
_G62E$= 9|{t%F=- BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
le*'GgU# {
vB<2f*U BOOL bAdded=FALSE;
8hZYZ /T for(int index=0;index<MAX_KEY;index++){
J^y}3ON if(hCallWnd[index]==0){
-u nK; hCallWnd[index]=hWnd;
U)sw
Iis E HotKey[index]=cKey;
%@,!
( HotKeyMask[index]=cMask;
4DTT/ER'qA bAdded=TRUE;
C{<dzooz KeyCount++;
+9fQ YJBA break;
C"
2K U* }
g^mnYg5 }
SJai<>k h return bAdded;
~!iZn }
Acl?w }Y r:~q{ BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
+U^H`\EUr {
s~tZN BOOL bRemoved=FALSE;
s9\N{ar# for(int index=0;index<MAX_KEY;index++){
Hgk@I; if(hCallWnd[index]==hWnd){
N'@E^
rYc if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
6Qx[W>I hCallWnd[index]=NULL;
{k15!(:i~a HotKey[index]=0;
cAQ_/> HotKeyMask[index]=0;
Vm8rQFCp74 bRemoved=TRUE;
\b6vu^;p KeyCount--;
AK_,$'f break;
]ME2V }
5\jzIB_? }
ZQ)vvD< }
7 ~9Lj return bRemoved;
$ vt6~nfI }
Sa 8T'%W S0]JeP+3! void VerifyWindow()
|e+r|i] {
0/4"Jh$t for(int i=0;i<MAX_KEY;i++){
p\G1O*Z if(hCallWnd
!=NULL){ WMXxP gik
if(!IsWindow(hCallWnd)){ h~r&7G@[}
hCallWnd=NULL; ~R*01AnZ
HotKey=0; e9p!Caf~I-
HotKeyMask=0; Wi"3kps q
KeyCount--; tW[dJKw
} MD+e!A# o
} Gl]z@ZXWIw
} Bgf'Hm%r
} g><itA?
6Z>G%yK
BOOL CHookApp::InitInstance() `Re{j{~s
{ x4Wu`-4^
AFX_MANAGE_STATE(AfxGetStaticModuleState()); wN2D{Jj
hins=AfxGetInstanceHandle(); zS/1v+
InitHotkey(); VC.zmCglo^
return CWinApp::InitInstance(); XbYST%|.
} h{/lW#[
ur|
vh5
int CHookApp::ExitInstance() 2SRmh!hr
{ l\"wdS}
VerifyWindow(); ,1e\}^
UnInit(); -& T.rsp
return CWinApp::ExitInstance(); bqcwZ6r<
} Fu\!'\6
OeYZLC(
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file $X ]t}=
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) 4OTrMT$y
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ D0*+7n3
#if _MSC_VER > 1000 n?S~(4%
#pragma once &j!q9F
#endif // _MSC_VER > 1000 Gg# 1k TK
J_}Rsp ED
class CCaptureDlg : public CDialog iVZX
{ o!Y61S(
// Construction xWxgv;Ah
public: CSVL,(Uw
BOOL bTray; Mq Q'Kjo
BOOL bRegistered; myqQqVW
BOOL RegisterHotkey(); ,UATT]>
UCHAR cKey; s#4Q?<65u
UCHAR cMask; %j.
*YvveW
void DeleteIcon(); #QM9!k@9k
void AddIcon(); =j^wa')
UINT nCount; rL23^}+^`
void SaveBmp(); 9}<iS w[
CCaptureDlg(CWnd* pParent = NULL); // standard constructor l % 0c{E~
// Dialog Data 0kxe5*-|
//{{AFX_DATA(CCaptureDlg) iM +p{/bN
enum { IDD = IDD_CAPTURE_DIALOG }; K[R.B!;N
CComboBox m_Key; .gs:.X)TG9
BOOL m_bControl; R&@NFin
BOOL m_bAlt; 30<3DA_P
BOOL m_bShift; Q4B(NYEu(
CString m_Path; H|I.h{:
CString m_Number; DP08$Iq
//}}AFX_DATA
hpOK9
// ClassWizard generated virtual function overrides 7f]O /
//{{AFX_VIRTUAL(CCaptureDlg) vhz Q.>
public: %h4|$
virtual BOOL PreTranslateMessage(MSG* pMsg); D22jWm2
protected: A(T=
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support Mp_SL^g|
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); 2bt).gGm
//}}AFX_VIRTUAL +O?`uV
// Implementation 7z9[\]tt
protected: V\P
.uOI
HICON m_hIcon; 5z@QAQ
// Generated message map functions 3bZ:*6W.6
//{{AFX_MSG(CCaptureDlg) ~=/.ZUQNX
virtual BOOL OnInitDialog(); !I+F8p
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); v])R6-T-
afx_msg void OnPaint(); JVq`v#8
afx_msg HCURSOR OnQueryDragIcon(); XEb+Z7L 1
virtual void OnCancel(); PmlQW!gfBi
afx_msg void OnAbout(); 6r }w
afx_msg void OnBrowse(); ?V$@2vBVX4
afx_msg void OnChange(); H5/w!y@
//}}AFX_MSG y;ymyy&
DECLARE_MESSAGE_MAP() e?\34F
}; `XK#sCC
#endif y2:Bv2}
Igb%bO_
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file ^^kL.C Ym
#include "stdafx.h" Dy^A??A[E}
#include "Capture.h" U{ZKxE
#include "CaptureDlg.h" {9|S,<9
#include <windowsx.h> Q'c[yu
#pragma comment(lib,"hook.lib") '$y.`/$
#ifdef _DEBUG XBN,{
#define new DEBUG_NEW *$9Rb2}kK
#undef THIS_FILE KDu~,P]
static char THIS_FILE[] = __FILE__; R/ 3#(5
#endif an,JV0
#define IDM_SHELL WM_USER+1 +{[E Ow
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); Oz4yUR
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); u=&$Z
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; 0*50uK=5
class CAboutDlg : public CDialog nAk;a|Q
{ 0wZAsG"Bg
public: Py~N.@(:1u
CAboutDlg(); cW?~]E'<
// Dialog Data Qo])A6$IU
//{{AFX_DATA(CAboutDlg) )!g@MHHL
enum { IDD = IDD_ABOUTBOX }; ,N@N4<C]
//}}AFX_DATA BBHoD:l
// ClassWizard generated virtual function overrides by*v($
//{{AFX_VIRTUAL(CAboutDlg) iuHs.k<z
protected: V
u1|5
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support d;E
(^l
//}}AFX_VIRTUAL ^=,N]
j
// Implementation L,*#
protected: Dt
Ry%fA_
//{{AFX_MSG(CAboutDlg) _2rxDd1#.
//}}AFX_MSG ;0;5+ J7
DECLARE_MESSAGE_MAP() #r;uM+
}; Rkh
^|_<!
R*>EbOuI
CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) Yy4l -} "
{ a.B<W9$`
//{{AFX_DATA_INIT(CAboutDlg) c2Up<#t
//}}AFX_DATA_INIT C:{&cIFrPe
} eZ;DNZK av
W=zp:6Z~
void CAboutDlg::DoDataExchange(CDataExchange* pDX) 1j\wvPLr
{ =801nZJ
CDialog::DoDataExchange(pDX); S\W&{+3
//{{AFX_DATA_MAP(CAboutDlg) c*Q6k<SKR
//}}AFX_DATA_MAP apd"p{
} =(Wl'iG
_{48s8V
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) 8e}8@[h
//{{AFX_MSG_MAP(CAboutDlg) zZI7p[A[3
// No message handlers nWsR;~pK
//}}AFX_MSG_MAP g33Y]\
END_MESSAGE_MAP() ;%Rp=&J
_T (MMc
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) Z$2Vd`XP
: CDialog(CCaptureDlg::IDD, pParent) wZ\% !#}7
{ THHA~;00YN
//{{AFX_DATA_INIT(CCaptureDlg) w$FN(BfA
m_bControl = FALSE; >&l{_b\k
m_bAlt = FALSE; K])|
V
m_bShift = FALSE; X2to](\%X
m_Path = _T("c:\\"); -`d(>ok
m_Number = _T("0 picture captured."); zR_yxs'
nCount=0; O`FuXB(t
bRegistered=FALSE; AW/)R"+
bTray=FALSE; "7_qB8\
//}}AFX_DATA_INIT VDC"tSQ
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 {6brVN.V
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); }I
^e:,{
} H`Ld,E2ex&
r:9H>4m
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) ]-tAgNzl%
{ 5 @61=Au
CDialog::DoDataExchange(pDX); ["XS|"DM
//{{AFX_DATA_MAP(CCaptureDlg) 8,YxCm ie
DDX_Control(pDX, IDC_KEY, m_Key); 5H
|<h
DDX_Check(pDX, IDC_CONTROL, m_bControl); 9Li.B1j
DDX_Check(pDX, IDC_ALT, m_bAlt); \'Ewn8Qv8
DDX_Check(pDX, IDC_SHIFT, m_bShift); iWMgU:T
DDX_Text(pDX, IDC_PATH, m_Path); dX;G[\
DDX_Text(pDX, IDC_NUMBER, m_Number); Jej-b<HmQ
//}}AFX_DATA_MAP q<!KtI4
} 2-.%WhE/
"i/3m'<2
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) s&~.";b
//{{AFX_MSG_MAP(CCaptureDlg) d&5GkD.P
ON_WM_SYSCOMMAND() B)L;ja
ON_WM_PAINT() Dd$CN&Ca
ON_WM_QUERYDRAGICON() ,Z p9,nf
ON_BN_CLICKED(ID_ABOUT, OnAbout) :R9 DJh\
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) |,OTGZgc
ON_BN_CLICKED(ID_CHANGE, OnChange) Ehf3L |9
//}}AFX_MSG_MAP 6v9A7g;4.
END_MESSAGE_MAP() /dt'iai~l
e \ rb
BOOL CCaptureDlg::OnInitDialog() @iD5X.c
{ G?QU|<mj<
CDialog::OnInitDialog(); VKXZA2<?'
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); DsH`I%w{
ASSERT(IDM_ABOUTBOX < 0xF000); +yYSp8>
CMenu* pSysMenu = GetSystemMenu(FALSE); O4w:BWVsn
if (pSysMenu != NULL) ;
#^Jy#)
{ }^ G&n';J
CString strAboutMenu; 5N4[hQrVJ
strAboutMenu.LoadString(IDS_ABOUTBOX); w-(^w9_e
if (!strAboutMenu.IsEmpty()) V;SXa|,
{ x8wal[6
pSysMenu->AppendMenu(MF_SEPARATOR);
,1g*0W^
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); ?5#=Mh#
} 8/* 6&#-
} [Q*aJLG
SetIcon(m_hIcon, TRUE); // Set big icon HOY9{>E}z
SetIcon(m_hIcon, FALSE); // Set small icon /"%QIy'{
m_Key.SetCurSel(0); Il9pL~u
RegisterHotkey(); jt8%
L[
CMenu* pMenu=GetSystemMenu(FALSE); *,=WaODO %
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); MX#MDA-4
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); Z`lCS
o;
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); i&dMX:fRd
return TRUE; // return TRUE unless you set the focus to a control %*wOJx
} hr] :bR
+
s snCr
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) +: oD?h
{ sCF7K=a
if ((nID & 0xFFF0) == IDM_ABOUTBOX) xr\wOQ*`
{ 9p5{,9 .3*
CAboutDlg dlgAbout; =#c?g Wb56
dlgAbout.DoModal(); 34P5[j!h
} !^*I?9P
else <r{ )*]#l
{ Y8yRQz u
CDialog::OnSysCommand(nID, lParam); !.ot&EbE
} 3e.v'ccK&
} bs_"Nn?
dQ4K^u
void CCaptureDlg::OnPaint() ^"d!(npw
{ }uE8o"q
if (IsIconic()) Ghgo"-,#
{ ii:h
E=
CPaintDC dc(this); // device context for painting "nK(+Z
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); `kP
(2b
// Center icon in client rectangle =7c1l77z
int cxIcon = GetSystemMetrics(SM_CXICON); = ?hx+-'
int cyIcon = GetSystemMetrics(SM_CYICON); "jUr[X2J
CRect rect; K$..#]\TM
GetClientRect(&rect); B R-(@
int x = (rect.Width() - cxIcon + 1) / 2; )2P4EEs[
int y = (rect.Height() - cyIcon + 1) / 2; 6QOdd6_d
// Draw the icon
=*YK6
dc.DrawIcon(x, y, m_hIcon); K"sfN~@rT[
} KR6*)?c`
else NgnHo\)
{ *L9s7RR
CDialog::OnPaint(); T$'GFA
} ?wR;"
} wxg`[c$:
/WVnyz0
HCURSOR CCaptureDlg::OnQueryDragIcon() |WB<yA1
{ MKdBqnM(F
return (HCURSOR) m_hIcon; ZN2g(
} >_biiW~x :
qK4E:dD
void CCaptureDlg::OnCancel() %8T:r S
{ {daNw>TH
if(bTray) h
!~u9
DeleteIcon(); O]n"aAu@
CDialog::OnCancel(); qYW{$K
} =Po!\[SBU
_=_]Yx
void CCaptureDlg::OnAbout() *Bt`6u.>e,
{ /AR;O4X+
CAboutDlg dlg; b+NF:-fO
dlg.DoModal(); pQxaT$
} =De%]]>
g]V}azLr
void CCaptureDlg::OnBrowse() 1@Bq-2OD4
{ j}chU'if
CString str; ^ZFbp@#U
BROWSEINFO bi; ~4wbIE_rN
char name[MAX_PATH]; ;C%D+"l1g
ZeroMemory(&bi,sizeof(BROWSEINFO)); ZbYwuyHk(3
bi.hwndOwner=GetSafeHwnd(); ~$f+]7
bi.pszDisplayName=name; (9BjZ&ej
bi.lpszTitle="Select folder"; ?J+[|*'yK
bi.ulFlags=BIF_RETURNONLYFSDIRS; '?5=j1
LPITEMIDLIST idl=SHBrowseForFolder(&bi); *0y+=,"QU
if(idl==NULL) I~qS6#%r
return; Fz16m7.
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); 8=7u,t
str.ReleaseBuffer(); 2;4Of~
m_Path=str; &tKs
t,UR8
if(str.GetAt(str.GetLength()-1)!='\\') <}%>a@
m_Path+="\\"; &j/ WjZPF
UpdateData(FALSE); +b]g;
} 6:B[8otQ
cW,wN~
void CCaptureDlg::SaveBmp() *&B*/HAN
{ Um\Nd#=:
CDC dc; GljxYH"]#
dc.CreateDC("DISPLAY",NULL,NULL,NULL); 0K,*FdA
CBitmap bm; 0z."6r
int Width=GetSystemMetrics(SM_CXSCREEN); JW&/l
int Height=GetSystemMetrics(SM_CYSCREEN); >.PLD} zE_
bm.CreateCompatibleBitmap(&dc,Width,Height); Q/iaxY#
CDC tdc; mqk~Pno|<
tdc.CreateCompatibleDC(&dc); FpfOxF6A3
CBitmap*pOld=tdc.SelectObject(&bm); .F.4fk
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); l_u1 ~ K
tdc.SelectObject(pOld); |nXs'TO'O
BITMAP btm; _"J-P={=
bm.GetBitmap(&btm); fL"-K
DWORD size=btm.bmWidthBytes*btm.bmHeight; KEsMes(*
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size); xrO:Y!C?
BITMAPINFOHEADER bih; c\.4I4uy
bih.biBitCount=btm.bmBitsPixel; -<}_K,Ky`
bih.biClrImportant=0; qSMSTmnQ
bih.biClrUsed=0; El0|.dW
bih.biCompression=0; Og%qv
Bj 6
bih.biHeight=btm.bmHeight; K|Std)6
bih.biPlanes=1; /wI$}X5o~
bih.biSize=sizeof(BITMAPINFOHEADER); p0uQ>[NV0
bih.biSizeImage=size; c3!d4mC:
bih.biWidth=btm.bmWidth; ?YX2CJ6N
bih.biXPelsPerMeter=0; g!D?Yj4
bih.biYPelsPerMeter=0; Bfaj4i;_
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); zp"sM
z]
static int filecount=0; kwK<?\D
CString name; R#Id"O
name.Format("pict%04d.bmp",filecount++); a)4.[+wnRf
name=m_Path+name; bWwc2##7jo
BITMAPFILEHEADER bfh; A[;R_
bfh.bfReserved1=bfh.bfReserved2=0; (C,PGjd
bfh.bfType=((WORD)('M'<< 8)|'B'); V?HC\F-
bfh.bfSize=54+size; <<v,9*h
bfh.bfOffBits=54; vgHMVzxj
CFile bf; +WK!}xZR
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ NXDdU^w7B
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); SwG:?T!"}
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); Gs.id^Sf
bf.WriteHuge(lpData,size); FbJlyWND
bf.Close(); +D`IcR-x
nCount++; "m _wYX
} c5<M=$
GlobalFreePtr(lpData); g-meJhX%
if(nCount==1) Am!$\T%2
m_Number.Format("%d picture captured.",nCount); qWtvo';3
else 5>"$95D
m_Number.Format("%d pictures captured.",nCount); xgL*O>l)
UpdateData(FALSE); @1gX>!
} U9IN# ;W
Gu|}ax"
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) p-y,OG
{ d;9 X1`"
if(pMsg -> message == WM_KEYDOWN) QOEcp% 6I}
{ x g/3*rL
if(pMsg -> wParam == VK_ESCAPE) ?W9$=
return TRUE; AlIFTNg:"
if(pMsg -> wParam == VK_RETURN) ]k]P (w
return TRUE; lycY1 lK
} B:a&)Lwp0
return CDialog::PreTranslateMessage(pMsg); %[-D&flKC
} Sh*LD
QL<?
/{d7%Et6
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) Obrv5%'
{ Q~#udEajI
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){
5pI2G
SaveBmp(); i(2s"Uww,
return FALSE; tqAh&TW3+
} X&TTw/J!^
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ UOZ"#cQ
CMenu pop; g,7`emOX
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); ?^Q!=W<7
CMenu*pMenu=pop.GetSubMenu(0); c#
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pMenu->SetDefaultItem(ID_EXITICON); ^|Of
CPoint pt; |(*ReQ?=
GetCursorPos(&pt); cMsm[D{b
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); - ~T LI&[
if(id==ID_EXITICON) 7d]}BLpjWz
DeleteIcon(); :xm,Ok
else if(id==ID_EXIT) ga?.7F
OnCancel(); >jME
== U0
return FALSE; ux& WN ,
} vp1IYW
LRESULT res= CDialog::WindowProc(message, wParam, lParam); _)yn6M'Dt
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) e]'ui<`
AddIcon(); ly7\H3
return res; y>3Zh5=
} b\Y<1EV^[
ZO5_n
void CCaptureDlg::AddIcon() .EM0R\q
{ 0WaC.C+2i
NOTIFYICONDATA data; B?`Gs^Y{z
data.cbSize=sizeof(NOTIFYICONDATA); IKMkpX!]
CString tip; Fc M
tip.LoadString(IDS_ICONTIP); IC{\iwO/~c
data.hIcon=GetIcon(0); U}~SY
data.hWnd=GetSafeHwnd(); z8G1[ElY
strcpy(data.szTip,tip); NGOc:>}k>
data.uCallbackMessage=IDM_SHELL; b
lP@Cn2
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; |,cQJ
data.uID=98; P
hs4]!
Shell_NotifyIcon(NIM_ADD,&data); &q^\*<B.^
ShowWindow(SW_HIDE); U$&G_&*0a
bTray=TRUE; [fiB!G]?
} !1$QNxgi
/bv1R5
void CCaptureDlg::DeleteIcon() vxhs1vh
{ 7xTgG!>v
NOTIFYICONDATA data; \
$;E,
data.cbSize=sizeof(NOTIFYICONDATA); <^c?M[j
data.hWnd=GetSafeHwnd(); y[:\kI
data.uID=98; 9=O`?$y
Shell_NotifyIcon(NIM_DELETE,&data); l=ehoyER
ShowWindow(SW_SHOW); ~[l6;bn
SetForegroundWindow(); fb3(9
ShowWindow(SW_SHOWNORMAL); 4{=zO(>
bTray=FALSE; 0+L:+S
} {4J:t_<nKO
zP$0B!9
void CCaptureDlg::OnChange() IL;JdIa
{ kU{+@MA;
RegisterHotkey(); @E;'Ffo
} XP'<\
gBp,p\ Xc
BOOL CCaptureDlg::RegisterHotkey() OC34@YUj[
{ (KtuikJ32^
UpdateData(); 2fFZ70Yh
UCHAR mask=0; n}/?nP\%
UCHAR key=0; Ezsb'cUa(
if(m_bControl) 'APtY;x^{
mask|=4; bnHQvCO3$
if(m_bAlt) :>4pH
mask|=2; ]CHO5'%,$
if(m_bShift) 1BK!<}yI{
mask|=1; h+=xG|1R[5
key=Key_Table[m_Key.GetCurSel()]; v EppkS U1
if(bRegistered){ -< D7
DeleteHotkey(GetSafeHwnd(),cKey,cMask); B( r~Nvc
bRegistered=FALSE; go >*n\
} wX5Yo{
cMask=mask; 2[!#Xf
cKey=key; hEUS&`K
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); J<hqF4z
return bRegistered; :/UO3 c(
} ko<u0SjF)u
}MQNzaXY^
四、小结 ere h!
T'_#Dwmj*
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。