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ui: Check the return value of ReleaseDC()

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This commit is contained in:
Hajime Hoshi 2016-08-09 00:25:47 +09:00
parent 96a43bcb4d
commit 3619a796dc
1 changed files with 10 additions and 5 deletions
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15
internal/ui/ui_windows.go
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@ -20,16 +20,21 @@ package ui
// //
// #include <windows.h> // #include <windows.h>
// //
// static int getDPI() { // static char* getDPI(int* dpi) {
// HDC dc = GetWindowDC(0); // HDC dc = GetWindowDC(0);
// int dpi = GetDeviceCaps(dc, LOGPIXELSX); // *dpi = GetDeviceCaps(dc, LOGPIXELSX);
// ReleaseDC(0, dc); // if (!ReleaseDC(0, dc)) {
// return dpi; // return "ReleaseDC failed";
// }
// return "";
// } // }
import "C" import "C"
func deviceScale() float64 { func deviceScale() float64 {
dpi := int(C.getDPI()) dpi := C.int(0)
if errmsg := C.GoString(C.getDPI(&dpi)); errmsg != "" {
panic(errmsg)
}
return float64(dpi) / 96 return float64(dpi) / 96
} }