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:
[ 'aSPA
m}`!FaB # 一、实现方法
n;QMiz:yY S3fyt]pp 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:
O S?S$y d K.k,7R #pragma data_seg("shareddata")
4+?d0 HHOOK hHook =NULL; //钩子句柄
8p"R4 UINT nHookCount =0; //挂接的程序数目
~IQ3B$4H& static UCHAR HotKey[MAX_KEY] = {0}; //热键虚拟键码
{XR3L'X static UCHAR HotKeyMask[MAX_KEY] = {0}; //组合掩码, control=4,alt=2,shift=1
7UnB]- :. static HWND hCallWnd[MAX_KEY] = {0}; //window handle associated with hotkey
xQA6!j static int KeyCount =0;
so=Ux2 static UCHAR MaskBits =0; //00000 Ctrl=4 & Alt=2 & Shift=1
KcPI,.4{ #pragma data_seg()
Cg#@JuwHa T'8d|$X 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。
85gdmla@9 s[2>r#M 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:
s\/$`fuhx JA!?vs BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR
{@E(p4W cKey,UCHAR cMask)
S~GL_#a {
>tGl7Ov BOOL bAdded=FALSE;
&-R(u}m-F for(int index=0;index<MAX_KEY;index++){
1>)q5D if(hCallWnd[index]==0){
7j,u&%om hCallWnd[index]=hWnd;
_4^#VD#f HotKey[index]=cKey;
.0=VQU HotKeyMask[index]=cMask;
mssCnr; bAdded=TRUE;
4C]>{osv KeyCount++;
V;@kWE>3 break;
'jnR<>N }
wg.TCT2 }
"fH"U1Bw return bAdded;
lJ>OuSd }
n=_jmR1 //删除热键
`bAOhaB,/ BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
E=3UaYr {
%Bxp
!Bj BOOL bRemoved=FALSE;
D2N<a= # for(int index=0;index<MAX_KEY;index++){
N Ftmus if(hCallWnd[index]==hWnd){
u*w'.5l if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
4s_|6{ANS hCallWnd[index]=NULL;
QtSJ9;eP HotKey[index]=0;
ZkA05wPZ# HotKeyMask[index]=0;
(,P6cWt}" bRemoved=TRUE;
.+#<~Jv KeyCount--;
5yl[#>qt break;
B QxU~s }
u*"mdL2 }
J}?:\y< }
QJ%[6S return bRemoved;
-h%!#g }
z\g6E/ %% 9fhgCu]$ 8
o^ h\9I DLL中的钩子函数如下:
| >
t,1T. ]:g;S,{ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
09_5niaz[ {
'O:QS) BOOL bProcessed=FALSE;
x )w6 if(HC_ACTION==nCode)
0YsBAfRG {
Z23*`yR if((lParam&0xc0000000)==0xc0000000){// 有键松开
VC T~"T2R switch(wParam)
!8jr $ {
N.1@!\z@@ case VK_MENU:
ps@;Z?Q MaskBits&=~ALTBIT;
u&-Zh@;Q7 break;
'h*^;3@* case VK_CONTROL:
.5AyB9a%& MaskBits&=~CTRLBIT;
J{w[vcf break;
XLq%nVBM8\ case VK_SHIFT:
Ec4+wRWk85 MaskBits&=~SHIFTBIT;
y/9aI/O' break;
{3H)c^Q default: //judge the key and send message
D-KQRe2@ break;
=G<i6%(^g }
I UZ@n0/T for(int index=0;index<MAX_KEY;index++){
K (!+l if(hCallWnd[index]==NULL)
?7k%4~H t continue;
kD?lMA__ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
a}p}G\b| {
:Sc"fG,g) SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
ZIr&_x#e bProcessed=TRUE;
5vSJjhS }
&:@)roCR }
|G(9mnZ1 }
@!np
0# else if((lParam&0xc000ffff)==1){ //有键按下
"j*{7FBqk switch(wParam)
.$~zxd#zo {
jM07&o]D case VK_MENU:
:=cZ,?PQp1 MaskBits|=ALTBIT;
c7~>uNgJ break;
4Rv.m*^ B case VK_CONTROL:
drkY~!a MaskBits|=CTRLBIT;
mSFh*FG break;
9L+g;Js$4 case VK_SHIFT:
L0QF(:F5 MaskBits|=SHIFTBIT;
_X/`7!f break;
7FBaN7l default: //judge the key and send message
rAwuWM@BIg break;
:GBM`f@ }
hT
DFIYV for(int index=0;index<MAX_KEY;index++){
Lbwc2Q,.- if(hCallWnd[index]==NULL)
TDY2
M continue;
H="E#AC%8/ if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
*Y\C5L] {
93]67PL#+ SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
=F9!)r bProcessed=TRUE;
}:zTz%_K }
^$VH~i& }
m2esVvP }
.W*" C if(!bProcessed){ //一般按键事件,为监视键盘的程序留出余地
WETnrA"N for(int index=0;index<MAX_KEY;index++){
e{RhMjX<D if(hCallWnd[index]==NULL)
lHI;fR continue;
nP5T*-~ if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
}Kt1mmo:` SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
%K/zVYGm& //lParam的意义可看MSDN中WM_KEYDOWN部分
Z!eW_""wp }
^Ee"w7XjD }
a\]glw\; }
At$[&%} return CallNextHookEx( hHook, nCode, wParam, lParam );
I|eYeJ3 }
Mv%"aFC E/5/5'gBJO 抓图程序是一个基于对话框的程序,它在建立对话框的时候调用前面的DLL,登记热键,因此需要将hook.lib添加到工程里,在程序里给出两个DLL函数的定义,也可以写个头文件,再包含进来以下代码:
zho$g9* ,)beK*Iw BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
+>*! 3x+sE BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
J&w'0 +`]AutNv 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:
#*|Gp_l+% /UP1*L LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam)
2}<_l 2 {
kl+^0i if(message==WM_HOTKEY&&lParam==WM_KEYDOWN)
!=SBeq {
(_.0g}2 //lParam表示是按下还是松开,如果有多个热键,由wParam来区分
E#A%aLp0E SaveBmp();
_7=LSf,9 return FALSE;
P+2@,?9# }
L[rxs[7~ …… //其它处理及默认处理
!QXPn}q^0 }
{I^@BW- DGrk} -RKqbfmi= 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。
U_.9H
_G o4F?Rx,L 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。
6t!PHA 5'%nLW7;O 二、编程步骤
4mM?RGWv S:YQVj 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";
dHO8 bYBH 40$- ]i 2、 在"Hook"项目中导出AddHotkey()、DeleteHotkey()函数;
vp2s)W8W , SB5" 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;
gT0N\oU" EZb_8<DH 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;
*i,@d&J y] Wfp>BC 5、 添加代码,编译运行程序。
\iQ{Q&JR: hcX`X2^ 三、程序代码
e,8[fp-7 3z~d7J ///////////////////////////////////// Hook.h : main header file for the HOOK DLL
6*r#m%| #if !defined(AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_)
|SSe n#PYp #define AFX_HOOK_H__AEBFF705_C93A_11D5_B7D6_0080C82BE86B__INCLUDED_
#sHt3z)6I #if _MSC_VER > 1000
$Si|;j$? #pragma once
==]BrhZK #endif // _MSC_VER > 1000
&|Cd1z#? #ifndef __AFXWIN_H__
$ts1XIK% #error include 'stdafx.h' before including this file for PCH
Sece#K2J| #endif
HY>zgf,0 #include "resource.h" // main symbols
?Jy/]j5fI class CHookApp : public CWinApp
5e|yW0o {
,.,spoV public:
4qvE2W}& CHookApp();
8D:0Vhx\I // Overrides
Y:#nk.}> // ClassWizard generated virtual function overrides
kT1 2 //{{AFX_VIRTUAL(CHookApp)
p"tCMB public:
Ra)AQ
n virtual BOOL InitInstance();
_/[}PQC6G virtual int ExitInstance();
,qu7XFYrY //}}AFX_VIRTUAL
z;Yo76P //{{AFX_MSG(CHookApp)
L{F[>^1Sb
// NOTE - the ClassWizard will add and remove member functions here.
155vY // DO NOT EDIT what you see in these blocks of generated code !
F!qt=)V@w //}}AFX_MSG
o8c5~fG1 DECLARE_MESSAGE_MAP()
$az9Fmta };
G:4'')T LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam, LPARAM lParam);
@wPyXl BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask);
w:HRzU> BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask);
\ Dccf_(Pb BOOL InitHotkey();
3](At%ss BOOL UnInit();
aNDpCpy #endif
)l6(ss!J 1Rd2Xb //////////////////////////////////////// Hook.cpp : Defines the initialization routines for the DLL.
tYUg%2G #include "stdafx.h"
./@C #include "hook.h"
YS0^!7u #include <windowsx.h>
7w5C
NV #ifdef _DEBUG
';zS0Yk #define new DEBUG_NEW
PFI^+'; #undef THIS_FILE
%@MO5#)NI static char THIS_FILE[] = __FILE__;
Lu5lpeSQ #endif
/H~]5JZ3-E #define MAX_KEY 100
}F4%5go #define CTRLBIT 0x04
2e^6Od!Y? #define ALTBIT 0x02
0@> #define SHIFTBIT 0x01
GAU7w"sE #pragma data_seg("shareddata")
c@|f'V4 HHOOK hHook =NULL;
)zAATBb4. UINT nHookCount =0;
Wf{&D> static UCHAR HotKey[MAX_KEY] = {0}; //hotkey
)Nt'Z*K* static UCHAR HotKeyMask[MAX_KEY] = {0}; //flag for hotkey, value is VK_CONTRL or VK_NEMU or VK_SHIFT
2OZ<t@\OY static HWND hCallWnd[MAX_KEY] = {0}; //window associated with hotkey
L#MgoBXr static int KeyCount =0;
9+"ISXS static UCHAR MaskBits =0; //00000 Ctrl Alt Shift
`;)op3A' #pragma data_seg()
GV8`.3DBOF HINSTANCE hins;
=<[M$"S7d6 void VerifyWindow();
r8,'LZI z BEGIN_MESSAGE_MAP(CHookApp, CWinApp)
XDyFe'1I //{{AFX_MSG_MAP(CHookApp)
4WXr~?Vq9 // NOTE - the ClassWizard will add and remove mapping macros here.
TH>7XK<90M // DO NOT EDIT what you see in these blocks of generated code!
KmpKyc[ //}}AFX_MSG_MAP
zT+ "Z(oz, END_MESSAGE_MAP()
<[A;i
PM^Xh*~ CHookApp::CHookApp()
QP7N#mh {
OMm'm\+/ // TODO: add construction code here,
(Qd@Q,@(s // Place all significant initialization in InitInstance
auHP^O>4L }
7bL48W<QD F@<^ CHookApp theApp;
`N;O6
wZ LRESULT CALLBACK KeyboardProc(int nCode,WPARAM wParam,LPARAM lParam)
CF]#0*MI {
ffG1QvC|M BOOL bProcessed=FALSE;
cpu|tK.t if(HC_ACTION==nCode)
q854k+C {
b&P2VqYgl if((lParam&0xc0000000)==0xc0000000){// Key up
N[&(e
d= switch(wParam)
U-pBat.$'C {
UL0n>Wa5 case VK_MENU:
iJSyi;l| MaskBits&=~ALTBIT;
K`8$+JDP+ break;
eCwR
}m?_ case VK_CONTROL:
{)wl`mw3 MaskBits&=~CTRLBIT;
?o`fX
wE break;
gr \vC case VK_SHIFT:
C )BVsHT4 MaskBits&=~SHIFTBIT;
^ 2LqKo\T break;
nVoP:FHH default: //judge the key and send message
xG:7AGZ$[ break;
C]M{ }
[[uZCKi for(int index=0;index<MAX_KEY;index++){
UUEbtZH; if(hCallWnd[index]==NULL)
j"9Zaq_ continue;
1O+$"5H if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
l
9bg {
4\y>pXML-U SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYUP);
DAQozhP8 bProcessed=TRUE;
[E;~Y_l }
;Swj`'7 }
Voo_
? }
N{?Qkkgx else if((lParam&0xc000ffff)==1){ //Key down
,U=7#Cf! switch(wParam)
1?{w~cF} {
O#`y;% case VK_MENU:
jBU!xCO MaskBits|=ALTBIT;
e_dsBmTh break;
Ns6CxE9 case VK_CONTROL:
nmoC(| r MaskBits|=CTRLBIT;
t'* 2)U break;
/_i]bM7W case VK_SHIFT:
$!K,5^+ MaskBits|=SHIFTBIT;
D)bR-a_^ break;
ZU.f)94u default: //judge the key and send message
`3L?x8g break;
Qk8YR5K
}
Z4{~ for(int index=0;index<MAX_KEY;index++)
:tp{(MF {
E[M.q;rM if(hCallWnd[index]==NULL)
G$1gk ^G's continue;
W <M\b# if(IsWindow(hCallWnd[index])&&(HotKey[index]==wParam)&&(HotKeyMask[index]==MaskBits))
qhOV>j,d {
=po5Q6@i SendMessage(hCallWnd[index],WM_HOTKEY,wParam,WM_KEYDOWN);
3$PGLM bProcessed=TRUE;
pXf5/u8& }
H;Gd }
bix}#M }
@pV&{Vp if(!bProcessed){
jN{+$ @cI for(int index=0;index<MAX_KEY;index++){
Rip[ if(hCallWnd[index]==NULL)
PjkjUP continue;
M4K>/-9X+V if(IsWindow(hCallWnd[index])&&(HotKey[index]==0)&&(HotKeyMask[index]==0))
G`NGt_C SendMessage(hCallWnd[index],WM_HOTKEY,WM_HOTKEY,lParam);
79}Qj7 }
.`+N+B(4 }
X -_0wR }
yT h60U return CallNextHookEx( hHook, nCode, wParam, lParam );
K!;>/3Y2- }
Kbcr-89Gv~ O>>%lr| BOOL InitHotkey()
e@L?jBj8m {
%J:2y if(hHook!=NULL){
q@}tv=} nHookCount++;
GtkZ%<KF9 return TRUE;
^A$p)`KR }
J4jL%5t else
s`o_ER hHook=SetWindowsHookEx(WH_KEYBOARD,(HOOKPROC)KeyboardProc,hins,0);
!KLY*bt6 if(hHook!=NULL)
H~~>ut6` nHookCount++;
-}P/<cu: return (hHook!=NULL);
dgW/5g }
ya'OI P ` BOOL UnInit()
i~.9B7hdE {
XZ_vbYTj if(nHookCount>1){
=QW:},sp nHookCount--;
S/Gy:GIf return TRUE;
leO..M }
RaAvPIJa | BOOL unhooked = UnhookWindowsHookEx(hHook);
8~v E if(unhooked==TRUE){
k[/`G5 nHookCount=0;
v:u=.by99 hHook=NULL;
V,>uM
>$ }
,{g B$8z^ return unhooked;
;(;{~1~ }
pF'M zzZK S BOOL __declspec(dllexport) __stdcall AddHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
~jM!8]= {
Yjix]lUXVf BOOL bAdded=FALSE;
XXC(R for(int index=0;index<MAX_KEY;index++){
U[c^xz& if(hCallWnd[index]==0){
jmva0K},SE hCallWnd[index]=hWnd;
99?:
9g HotKey[index]=cKey;
P~u~`eH* HotKeyMask[index]=cMask;
CO"Nv bAdded=TRUE;
kqp*o+Oz', KeyCount++;
~k/GmH break;
8% `Jf` }
3<ry/{#% }
w[s}#Q return bAdded;
lvIdYf$? }
@1+({u#B OM#eJ,MH<) BOOL __declspec(dllexport) __stdcall DeleteHotkey(HWND hWnd,UCHAR cKey,UCHAR cMask)
Nx<%'-9)| {
z#t;n BOOL bRemoved=FALSE;
IGcYPL\& for(int index=0;index<MAX_KEY;index++){
Un{ 9reX5 if(hCallWnd[index]==hWnd){
@M8vPH if(HotKey[index]==cKey&&HotKeyMask[index]==cMask){
[h~#5x
hCallWnd[index]=NULL;
T|ZJ$E0 HotKey[index]=0;
o7t#yw3 HotKeyMask[index]=0;
}XIUz| bRemoved=TRUE;
^3w
>:4m KeyCount--;
|f<-lB[k break;
HbQ+:B] }
#~:@H&f790 }
o :_'R5 }
d/&~IR return bRemoved;
SMbhJ}\O }
y<*/\]t9L[ V"Y-|R void VerifyWindow()
^RE("'+ {
'U'Y[*m@ for(int i=0;i<MAX_KEY;i++){
}?=4pGsI if(hCallWnd
!=NULL){ d9yfSZ
if(!IsWindow(hCallWnd)){ f>jAu;S
hCallWnd=NULL; 0j(/ N
HotKey=0; ;8>
TD&]{
HotKeyMask=0; "CF{Mu|Q=
KeyCount--; ,-_\Y hY>
} /\|Behif
} l|'{Cb
} 1g bqHxWI
} -+Ab[
s.KHm
L3
BOOL CHookApp::InitInstance() ew\ZF qA;
{ Q*l_QnfG
AFX_MANAGE_STATE(AfxGetStaticModuleState()); +!)v=NY
hins=AfxGetInstanceHandle(); GN@(!V#/4
InitHotkey(); K*fh`Kz
return CWinApp::InitInstance(); U8icP+Y
} o~={M7m
$C~OV@I
int CHookApp::ExitInstance() x/xd
{ 9ZXEy }q57
VerifyWindow(); 3ew`e"s
UnInit(); ;-@v1I;
return CWinApp::ExitInstance(); q8P$Md-=b1
} =#sr4T
Uh8c!CA8:\
////////////////////////////////////////////////////////////////////// CaptureDlg.h : header file "[p-Iy1
#if !defined(AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_) kSH|+K\M4
#define AFX_CAPTUREDLG_H__97B51708_C928_11D5_B7D6_0080C82BE86B__INCLUDED_ !(-S?*64l
#if _MSC_VER > 1000 sU 5/c|&
#pragma once >(39K
#endif // _MSC_VER > 1000 QzX|c&&>u2
y759S)U>>p
class CCaptureDlg : public CDialog B kWoK/f4
{ 2'5%EQW;0y
// Construction 8sGaq [
public: *:hHlH* t1
BOOL bTray; x,>r}I>^Q
BOOL bRegistered; "L~qsFL
BOOL RegisterHotkey(); sQ>L3F;A`
UCHAR cKey; %W:]OPURK
UCHAR cMask; 8^ezqd`
void DeleteIcon(); \oc*
void AddIcon(); l8Ks{(wh
UINT nCount; QeZK&^W
void SaveBmp(); v35=4>Y
CCaptureDlg(CWnd* pParent = NULL); // standard constructor Ht!]%
// Dialog Data S1oP_A[|
//{{AFX_DATA(CCaptureDlg) yp.\KLq8)
enum { IDD = IDD_CAPTURE_DIALOG }; UA]U_P$c
CComboBox m_Key; Jx_BjkF
BOOL m_bControl; s6| S#
BOOL m_bAlt; y?*4SLy
BOOL m_bShift; MH=;[ | N
CString m_Path; Zcg@]Sx(I
CString m_Number; K84VeAe
//}}AFX_DATA v6q oH)n
// ClassWizard generated virtual function overrides 'k?*?XxG
//{{AFX_VIRTUAL(CCaptureDlg) o9#8q_D9
public: R@Kzdeo
virtual BOOL PreTranslateMessage(MSG* pMsg); 2%*mL98WK
protected: YqSkz|o}m
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support -k I;yL
virtual LRESULT WindowProc(UINT message, WPARAM wParam, LPARAM lParam); U" ;8zplU
//}}AFX_VIRTUAL ,ThN/GkSC
// Implementation ;u
"BCW
protected: T0=%RID%=
HICON m_hIcon; E ) iEWc
// Generated message map functions |SfmQ;
//{{AFX_MSG(CCaptureDlg) 9et%Hn.K'
virtual BOOL OnInitDialog(); N5\]VCX
afx_msg void OnSysCommand(UINT nID, LPARAM lParam); @XRN#_{
afx_msg void OnPaint(); iR(jCD?) Y
afx_msg HCURSOR OnQueryDragIcon(); ,/bv3pE
virtual void OnCancel(); F2#s^4Ii
afx_msg void OnAbout(); >;}q
afx_msg void OnBrowse(); U#=5HzE
afx_msg void OnChange(); m0zbG1OE
//}}AFX_MSG `rLy7\@;
DECLARE_MESSAGE_MAP() -AcVVK&
}; cgevP`*]
#endif Y ~%9TC
oe*Y(T\G
////////////////////////////////////////////////////////////// CaptureDlg.cpp : implementation file 27q=~R}
#include "stdafx.h" W|e$@u9
#include "Capture.h" 6o4Bf| E]
#include "CaptureDlg.h" 5h6c W
#include <windowsx.h> y-i6StJ
#pragma comment(lib,"hook.lib") eW>Y*l%B
#ifdef _DEBUG a8wQ,
#define new DEBUG_NEW m^M sp:T,
#undef THIS_FILE +#a_Y
static char THIS_FILE[] = __FILE__; \Q m1+tg
#endif />,KWHR|:
#define IDM_SHELL WM_USER+1 12JmSvD
BOOL __declspec(dllexport)__stdcall AddHotkey(HWND,UCHAR key,UCHAR mask); x%d\}%]
BOOL __declspec(dllexport)__stdcall DeleteHotkey(HWND,UCHAR key,UCHAR mask); XFv) ]_G
UCHAR Key_Table[]={0x78,0x79,0x7a,0x7b,0x6a,0x30,0x31,0x32,0x33,0x34,0x35,0x36,0x37,0x38,0x39}; s}5,<|DL
class CAboutDlg : public CDialog CV
)v6f
{ VA^yv1We
public: [9U::
CAboutDlg(); 0V_dg |.
// Dialog Data 6mAaFDI,R
//{{AFX_DATA(CAboutDlg) +P5\N,,7R
enum { IDD = IDD_ABOUTBOX }; e[)oT
//}}AFX_DATA yRF
%SWO
// ClassWizard generated virtual function overrides {InD/l'v6n
//{{AFX_VIRTUAL(CAboutDlg) ap y#8]
protected: XD=p:Ezh
virtual void DoDataExchange(CDataExchange* pDX); // DDX/DDV support 'l7ey3B%
//}}AFX_VIRTUAL 4gkaCk{]
// Implementation U.,_zEbx,
protected: 6<
T@\E
//{{AFX_MSG(CAboutDlg) +i0j3.
//}}AFX_MSG 8pZGu8
DECLARE_MESSAGE_MAP() lUJ~_`D
}; u{ +z?N
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CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD) 4ZAnq{nR4
{ uKL4cr@
//{{AFX_DATA_INIT(CAboutDlg) @j/|U04_Z
//}}AFX_DATA_INIT .Fe_Z)i>h
} [W#M(`}D
:3aZ_
void CAboutDlg::DoDataExchange(CDataExchange* pDX) R$Or&:E ^
{ K#>@T<
CDialog::DoDataExchange(pDX); Y_SB3 $])
//{{AFX_DATA_MAP(CAboutDlg) (0W)Jd[
//}}AFX_DATA_MAP Pv#>j\OR&
} Un.u{$po
lcqpwSk
BEGIN_MESSAGE_MAP(CAboutDlg, CDialog) V9dJNt'Ui
//{{AFX_MSG_MAP(CAboutDlg) 41Nm+$m
// No message handlers zD z"Dn9
//}}AFX_MSG_MAP jM%8h$&E
END_MESSAGE_MAP() %Xfy.v
{I:nza
CCaptureDlg::CCaptureDlg(CWnd* pParent /*=NULL*/) zlhHSy K
: CDialog(CCaptureDlg::IDD, pParent) Q`{2yU:r
{ c ?(X(FQ
//{{AFX_DATA_INIT(CCaptureDlg) 2iV/?.<Z&
m_bControl = FALSE; b\9MM
m_bAlt = FALSE; o NqIrYH'
m_bShift = FALSE; h:3^FV
m_Path = _T("c:\\"); :)eU)r"s4
m_Number = _T("0 picture captured."); B65"jy
nCount=0; ~(~
y=M
bRegistered=FALSE; WPpS?
bTray=FALSE; _ \LPP_
//}}AFX_DATA_INIT t 8,VR FV
// Note that LoadIcon does not require a subsequent DestroyIcon in Win32 &]_2tN=S$
m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME); lv=rL
} =(cfo_B@K
7(W"NF{r
void CCaptureDlg::DoDataExchange(CDataExchange* pDX) %m5&Y01
{ r 1x2)
CDialog::DoDataExchange(pDX); $FM:8^
//{{AFX_DATA_MAP(CCaptureDlg) A]_5O8<buW
DDX_Control(pDX, IDC_KEY, m_Key); G%#M17
DDX_Check(pDX, IDC_CONTROL, m_bControl); /ho7O/aAa
DDX_Check(pDX, IDC_ALT, m_bAlt); ;T,`m^@zf
DDX_Check(pDX, IDC_SHIFT, m_bShift); A/A;'9
DDX_Text(pDX, IDC_PATH, m_Path); Bl1^\[#
DDX_Text(pDX, IDC_NUMBER, m_Number); 4u}jkd$]*
//}}AFX_DATA_MAP W0qn$H
} >5c38D7k)
?Zv>4+Y'
BEGIN_MESSAGE_MAP(CCaptureDlg, CDialog) =f\BAi
//{{AFX_MSG_MAP(CCaptureDlg) EWNm }C9
ON_WM_SYSCOMMAND() :|PI_
$4H
ON_WM_PAINT() t8_i[Hw6D
ON_WM_QUERYDRAGICON() f~-qjEWm
ON_BN_CLICKED(ID_ABOUT, OnAbout) .;,` bH0
ON_BN_CLICKED(IDC_BROWSE, OnBrowse) g* DBW,
ON_BN_CLICKED(ID_CHANGE, OnChange) 3@8Zy:[8<
//}}AFX_MSG_MAP (\o &Gl
END_MESSAGE_MAP() <#%kmYSL
CjT]!D)s
BOOL CCaptureDlg::OnInitDialog() 3^-yw`
{ f C_H0h3
CDialog::OnInitDialog(); H5X.CcI&}
ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX); OZn40"`
ASSERT(IDM_ABOUTBOX < 0xF000); l`(pV ;{W
CMenu* pSysMenu = GetSystemMenu(FALSE); ';iLk[
if (pSysMenu != NULL) ,he1WjL
{ Cak-J~=
CString strAboutMenu; trm-&e7q?;
strAboutMenu.LoadString(IDS_ABOUTBOX); 7:Be.(a
if (!strAboutMenu.IsEmpty()) G+V?c1Me
{ \yKYBfp-p
pSysMenu->AppendMenu(MF_SEPARATOR); ?j|i|WUD
pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu); >m'n#=yap
} s.j6"
Q[W
} ywkyxt
SetIcon(m_hIcon, TRUE); // Set big icon {O"N2W
SetIcon(m_hIcon, FALSE); // Set small icon oF {u
m_Key.SetCurSel(0); &T&>4I!'M
RegisterHotkey(); g),t
CMenu* pMenu=GetSystemMenu(FALSE); O&@pi-=o
pMenu->DeleteMenu(SC_MAXIMIZE,MF_BYCOMMAND); ay`A Gr
pMenu->DeleteMenu(SC_SIZE,MF_BYCOMMAND); qx2M"uFJ
pMenu->DeleteMenu(SC_RESTORE,MF_BYCOMMAND); R
Y ";SfYb
return TRUE; // return TRUE unless you set the focus to a control 6~.{~+Bd
} B82SAV/O
>4iVVs
void CCaptureDlg::OnSysCommand(UINT nID, LPARAM lParam) _sX@BE
{ JK9 J;c#T
if ((nID & 0xFFF0) == IDM_ABOUTBOX) fj:q_P67o
{ ,cCBAOueO
CAboutDlg dlgAbout; >#EOCo
dlgAbout.DoModal(); ['JIMcD
} I6lWB(H!u
else n1r'Y;G
{ JS#AoPWA
CDialog::OnSysCommand(nID, lParam); _4-UM2o;
} 0*F<tg,+]
} 3#Qek2
p|RFpn2ygF
void CCaptureDlg::OnPaint() 6X[Mn2wYW
{ rGUu K0L&
if (IsIconic()) <&MY/vV
{ F*J@OY8i
CPaintDC dc(this); // device context for painting z(
^
r
SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0); 8/BWe
;4
// Center icon in client rectangle !63]t?QXMG
int cxIcon = GetSystemMetrics(SM_CXICON); owKOH{otf
int cyIcon = GetSystemMetrics(SM_CYICON); +LB2V3UZ
CRect rect; Q1^kU0M }
GetClientRect(&rect); MR}h}JEx0
int x = (rect.Width() - cxIcon + 1) / 2; cVuT|b^
int y = (rect.Height() - cyIcon + 1) / 2; 9`Zwa_Tni
// Draw the icon Z>(K|3_
dc.DrawIcon(x, y, m_hIcon);
j7sRmQCl
} @D+2dT0[M
else gvCQ![
{ $c1xh.
CDialog::OnPaint(); =.\PG[
} +Vw]DLWR
} Y |'}VU
6O|
rI>D
HCURSOR CCaptureDlg::OnQueryDragIcon() wS @-EcCB
{ Cu`ty] -'
return (HCURSOR) m_hIcon; [I2vg<my
} YLehY
T))F
r:
void CCaptureDlg::OnCancel() K6G+sBw[
{ Qa@]
sWcM
if(bTray) x03@} M1
DeleteIcon(); =BroH\
CDialog::OnCancel(); 2 i97
} <}('w/
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void CCaptureDlg::OnAbout() 4o,G[Cf_
{ k4+ Q$3"
CAboutDlg dlg; Ux+UcBKm-
dlg.DoModal(); B'8T+qvA
} 91\]Dg
M&J$9X
void CCaptureDlg::OnBrowse() 'h3yxf}\
{ r O-=):2
CString str; u`Abko<D
BROWSEINFO bi; ':#DROe!
char name[MAX_PATH]; :)DvZx HE@
ZeroMemory(&bi,sizeof(BROWSEINFO)); ^
RIWW0
bi.hwndOwner=GetSafeHwnd(); S:{`eDk\A_
bi.pszDisplayName=name; qt`HP3J&
bi.lpszTitle="Select folder"; |<!xD
iB
bi.ulFlags=BIF_RETURNONLYFSDIRS; !~fy".|x
LPITEMIDLIST idl=SHBrowseForFolder(&bi); 6YF<GF{
if(idl==NULL) F42?h:y8I
return; QQ\\:]iM
SHGetPathFromIDList(idl,str.GetBuffer(MAX_PATH)); ,?(U4pzX
str.ReleaseBuffer(); V|j{#;
m_Path=str; .M( [n-
if(str.GetAt(str.GetLength()-1)!='\\') BXa.XZ<n(
m_Path+="\\"; v%E~sX&CG
UpdateData(FALSE); @~C
C$Y$
} ,&iZ*6=X?0
o@uZU4MM
void CCaptureDlg::SaveBmp() n0%5mTUN
{ g[ O6WZ!F_
CDC dc; 4`]
dc.CreateDC("DISPLAY",NULL,NULL,NULL); $8WeWmY
CBitmap bm; Rg%Xy`gS
int Width=GetSystemMetrics(SM_CXSCREEN); 3S{3AmKj?
int Height=GetSystemMetrics(SM_CYSCREEN); Hh`HMa'q
bm.CreateCompatibleBitmap(&dc,Width,Height); C8AR^FW
CDC tdc; T07 AH
tdc.CreateCompatibleDC(&dc); *^i"q\n5(
CBitmap*pOld=tdc.SelectObject(&bm); 1HBWOV7z.?
tdc.BitBlt(0,0,Width,Height,&dc,0,0,SRCCOPY); bEB9J-
Q
tdc.SelectObject(pOld); +O!4~k^
BITMAP btm; 8Az|SJ<
bm.GetBitmap(&btm); {Y1&GO;
DWORD size=btm.bmWidthBytes*btm.bmHeight; 9" cyZO
LPSTR lpData=(LPSTR)GlobalAllocPtr(GPTR,size);
a
Ju v{
BITMAPINFOHEADER bih; @Zw[LIQ*
bih.biBitCount=btm.bmBitsPixel; mu$rG3M
bih.biClrImportant=0; fR#W#n#m
bih.biClrUsed=0; K:54`UJ
bih.biCompression=0; v(~EO(n.
bih.biHeight=btm.bmHeight; rp,Us#>6
bih.biPlanes=1; NuR3]Ja\0
bih.biSize=sizeof(BITMAPINFOHEADER); tOxTiaa=
bih.biSizeImage=size; >9,:i)m_
bih.biWidth=btm.bmWidth; c!]Q0ib6
bih.biXPelsPerMeter=0; yM#
%UeZ\
bih.biYPelsPerMeter=0; i0'g$
GetDIBits(dc,bm,0,bih.biHeight,lpData,(BITMAPINFO*)&bih,DIB_RGB_COLORS); oq[r+E-]$@
static int filecount=0; 46gDoSS
CString name; (N?nOOQ
name.Format("pict%04d.bmp",filecount++); 79Ur1-]/
name=m_Path+name; 7}puj%JS
/
BITMAPFILEHEADER bfh; tu6<>
bfh.bfReserved1=bfh.bfReserved2=0; <6.?:Jj
bfh.bfType=((WORD)('M'<< 8)|'B'); 4P}d/w?'KL
bfh.bfSize=54+size; y/;DA=
bfh.bfOffBits=54; :4[_&]H
CFile bf; Qt.|YB8
if(bf.Open(name,CFile::modeCreate|CFile::modeWrite)){ 1^tM%2rP'
bf.WriteHuge(&bfh,sizeof(BITMAPFILEHEADER)); OXS.CFZM
bf.WriteHuge(&bih,sizeof(BITMAPINFOHEADER)); jKb4d9aX
bf.WriteHuge(lpData,size); eqk.+~^
bf.Close(); FB2{qG3
nCount++; Wn&9R
j
} ZwMd 22
GlobalFreePtr(lpData); 3u/ GrsF
if(nCount==1) 2?kVbF
m_Number.Format("%d picture captured.",nCount); D*t[5,~j
else Zx^R -9
m_Number.Format("%d pictures captured.",nCount); gdkHaLL"
UpdateData(FALSE); *0x!C8*`Xe
} =55V<VI
e,
}{$HStZ
BOOL CCaptureDlg::PreTranslateMessage(MSG* pMsg) d#|%h]
6
{ G6p R?K+
if(pMsg -> message == WM_KEYDOWN) DWupLJpk;c
{ +do*C=z
if(pMsg -> wParam == VK_ESCAPE) GjyTM
return TRUE; ~~}8D"
if(pMsg -> wParam == VK_RETURN) ]T._TZ"
return TRUE; %e+{wU}w?2
} E&>;a!0b]
return CDialog::PreTranslateMessage(pMsg); L~*nI d
} T@mYHKu
NL &![;
LRESULT CCaptureDlg::WindowProc(UINT message, WPARAM wParam, LPARAM lParam) TGuCIc0B{
{ t(1gJZs>kX
if(message==WM_HOTKEY&&lParam==WM_KEYDOWN){ 00pe4^U
SaveBmp(); x\ 8gb#8
return FALSE; th}&|Y)T2
} W/.Wp|C}K3
if(message==IDM_SHELL&&lParam==WM_RBUTTONUP){ 2/ejU,S
CMenu pop; y=zs6HaS
pop.LoadMenu(MAKEINTRESOURCE(IDR_MENU1)); "qoJIwl#q
CMenu*pMenu=pop.GetSubMenu(0); IwR=@Ne8
pMenu->SetDefaultItem(ID_EXITICON); O)c3Lm-w
CPoint pt; o.wXaS8
GetCursorPos(&pt); WF-^pfRq~
int id=pMenu->TrackPopupMenu(TPM_RIGHTALIGN|TPM_NONOTIFY|TPM_RETURNCMD|TPM_LEFTBUTTON,pt.x,pt.y,this); I].ddR%
if(id==ID_EXITICON) (5kL6d2
DeleteIcon(); &/?OP)N,}
else if(id==ID_EXIT) kW&zkE{
OnCancel(); ~!6
I.u
return FALSE; [nLd> 2P
} oxLO[js
LRESULT res= CDialog::WindowProc(message, wParam, lParam); x LGMN)@r
if(message==WM_SYSCOMMAND&&wParam==SC_MINIMIZE) wlpcuz@
AddIcon(); 0s6eF+bs
return res; ]L?WC
} |Elz{i-
74a k|(!
void CCaptureDlg::AddIcon() *
yGlX[
{ u.2^t:A
NOTIFYICONDATA data; ?ZYj5[op,H
data.cbSize=sizeof(NOTIFYICONDATA); AmK g;9LS
CString tip; k#G+<7c<
tip.LoadString(IDS_ICONTIP); *~^%s+b
data.hIcon=GetIcon(0); rBZ00}
data.hWnd=GetSafeHwnd(); vy5I#q(k
strcpy(data.szTip,tip); ~*L@|?
data.uCallbackMessage=IDM_SHELL; l"%WXi"X
data.uFlags=NIF_ICON|NIF_MESSAGE |NIF_TIP ; |#EI(W?`
data.uID=98; B-V
Shell_NotifyIcon(NIM_ADD,&data); jF-0 fK;)*
ShowWindow(SW_HIDE); c3*9{Il^
bTray=TRUE; J]|S0JC`
} 3iw.yR
S*%:ID|/C2
void CCaptureDlg::DeleteIcon() rd^j<
{ S"/gZfxer
NOTIFYICONDATA data; :Yn{:%p
data.cbSize=sizeof(NOTIFYICONDATA); pIY3ft\
data.hWnd=GetSafeHwnd(); hA+;eXy/
data.uID=98; tDtqTB}
Shell_NotifyIcon(NIM_DELETE,&data); Qm4cuV-0{
ShowWindow(SW_SHOW); (, $Lp0mB7
SetForegroundWindow(); n +dRAIqB
ShowWindow(SW_SHOWNORMAL); B RtT 7
bTray=FALSE; xLw[
aYy4
} vqo ~?9z[e
:-~x~ah-
void CCaptureDlg::OnChange() KJ_L>$
]*
{ |UN#utw{^Y
RegisterHotkey(); A/.z. K
} >Sm#-4B-
*2Q x69`
BOOL CCaptureDlg::RegisterHotkey() *-gmWATC6
{ `tm(3pJ
UpdateData(); Y^gIvX
UCHAR mask=0; ]#dZLm_
UCHAR key=0; q,]57s
if(m_bControl) P7!gUxcv9Y
mask|=4; uKo4nXVtp
if(m_bAlt) mWuhXY^Q
mask|=2; D1EHT}
if(m_bShift) t}gK)"g
mask|=1; Pcr;+'q
key=Key_Table[m_Key.GetCurSel()]; <9`/Y"\ p
if(bRegistered){ aq8mD^j -&
DeleteHotkey(GetSafeHwnd(),cKey,cMask); ~AR0 ,lak
bRegistered=FALSE; Q#Xa]A-
} o+?Ko=vYw
cMask=mask; qGgdWDn`
cKey=key; 8\[qR_LV
bRegistered=AddHotkey(GetSafeHwnd(),cKey,cMask); _RX*Ps=
return bRegistered; D 66!C{
} rm,h\
;
. hTfxE0
四、小结 )`zfDio-1V
||.Ve,<:
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。